W opracowaniu przedstawiono proste wzory na potrzeby wodne drzew owocowych dla warunków Polski wyprowadzone w oparciu o dane liczbowe podawane przez wielu autorów. Podano wzory do wyznaczenia potrzeb wodnych drzew owocowych na podstawie temperatury powietrza opracowane według danych liczbowych przedstawionych przez Drupkę, Kemmera i Schulza oraz Pressa. Przedstawiono metodę współczynników roślinnych z wykorzystaniem ewapotranspiracji wskaźnikowej obliczanej według metod zaproponowanych przez: Tredera, Blaney-Criddle'a w modyfikacji Żakowicza, Hargreaves'a w modyfikacji Droogersa i Allena oraz Hargreaves'a w modyfikacji Bogawskiego i Bednorz. Współczynniki roślinne dla poszczególnych miesięcy okresu wegetacji podano według Tredera oraz według Doorenbosa i Pruitta. Przedstawione wzory mogą być pomocne w oszacowaniu potrzeb nawadniania sadów (i winnic) w warunkach Polski i w podejmowaniu decyzji o lokalizacji urządzeń nawodnieniowych oraz ewentualnym stosowaniu nawodnień w sadach i winnicach na obszarze Polski. ...
Celem pracy było porównanie potrzeb wodnych wiśni w rejonie Bydgoszczy i Wrocławia w czterdziestoleciu 1976-2015. Potrzeby wodne plantacji wiśni - dla gleb średnich, lekkich i ciężkich - wyznaczono metodą Pressa dla średnich miesięcznych temperatur powietrza w okresie IV-VIII w każdym roku. Większe potrzeby wodne wiśni w okresie IV-VIII stwierdzono w rejonie Wrocławia niż w rejonie Bydgoszczy. W rejonie Bydgoszczy, średnio w badanym czterdziestoleciu 1976-2015, wynosiły one 253 mm na glebach ciężkich, 316 na glebach średnich i 379 mm na glebach lekkich. W rejonie Wrocławia natomiast kształtowały się one na poziomie odpowiednio: 261 mm, 326 mm i 391 mm. Największe potrzeby wodne wiśni - wśród analizowanych pięciu miesięcy - wystąpiły w lipcu. W rejonie Bydgoszczy, średnio w badanym czterdziestoleciu 1976-2015, wynosiły one: 65 mm na glebach ciężkich, 82 na glebach średnich i 98 mm na glebach lekkich. W rejonie Wrocławia natomiast były one wyższe i kształtowały się na poziomie odpowiednio: 67 mm, 84 mm i 101 mm. Stwierdzono statystycznie istotny trend zmienności czasowej potrzeb wodnych wiśni w okresie wegetacji (IV-VIII) w obu badanych rejonach, przy czym silniejsze zależności wystąpiły dla rejonu Wrocławia. Z przeprowadzonych analiz wynika, że w latach 1976-2015 potrzeby wodne wiśni w każdej dekadzie (dziesięciu latach) wzrastały o 3.9 ...
The aim of the study was to compare the water requirements and the precipitation deficiencies during cultivation of asparagus in the period from June to August in the regions of Bydgoszcz and Wroclaw. The water needs were calculated using the plant coefficient. The reference evapotranspiration was measured by Grabarczyk's method (1976). The coefficients kc, determined for the Polish conditions by Rolbiecki (2013), were used to estimate the water requirements considered as the crop evapotranspiration. In the studied period (from June to August, 1996-2015), higher water requirements of asparagus were noted in the Wroclaw region (366.1 mm) than in the Bydgoszcz region (288.5 mm). The monthly water needs in June, July and August were 69.8 mm, 128.8 mm and 167.5 mm, respectively, in the Wroclaw region, and 55.5 mm, 98.5 mm and 134.5 mm, respectively, in the Bydgoszcz region. In July, the tendency to increase the water requirements in both observed regions was noted. The monthly crop evapotranspiration in July rose in each decade by 12.3 mm in the Bydgoszcz region and by 21.2 mm in the Wroclaw region. In the 20-year study, the rainfall deficit in June and July during 11-13 years was noted. In August, the precipitation deficiencies were ...
The aim of the present research was an attempt to compare apple tree water requirements in the vegetation period in the Bydgoszcz region (Poland) and in the Isparta region (Turkey). The paper refers to the 1984-2014 temperature and precipitation values in the Bydgoszcz and Isparta regions. To determine the reference evapotranspiration (ET0), the calculation model by Hargreaves modified by Droogers and Allen was applied. Potential evapotranspiration, identified with apple tree water requirements, was determined using the method of plant coefficients proposed by Doorenbos and Pruitt. In each of the seven months considered (April-October) higher apple tree water requirements occurred in the Isparta region. The highest apple tree water requirements were noted in July and for that month during the thirty-year period they were 167.3 mm and 286 mm, on average, in the Bydgoszcz and Isparta regions, respectively. Daily water requirements of apple trees in July were more than 9.2 mm in the Isparta region and 5.4 mm in the Bydgoszcz region. Apple tree water requirements throughout the vegetation period (April-October) were much higher (by 120 %) in the Isparta region than in the Bydgoszcz region. The highest precipitation deficits occurred in July and amounted to 95.5 mm and 269.1 mm ...
The aim of the present research was to compare the water requirements of grapevine in the regions of Bydgoszcz and Wrocław in the forty-year period between 1976 and 2015. In the research the authors used the mean monthly temperature values (°C) and monthly precipitation (mm) for the May-September period in the years 1976-2015. The meteorological data for the Bydgoszcz region was derived from standard meteorological measurements performed at the Experiment Station at Mochełek, and analysed at the Department of Land Reclamation and Agrometeorology of the UTP University of Science and Technology in Bydgoszcz. The meteorological data for the Wrocław region were provided by the Swojec experiment station of the Wrocław University of Environmental and Life Sciences. The grapevine water requirements were determined as optimal precipitation assumed by Kemmer and Schulz. It has been found that the grapevine water requirements in 1976-2015, expressed as the optimal annual precipitation according to Kemmer and Schulz, were higher in the Wrocław region than in the Bydgoszcz region and they amounted to 469.3 mm and 435.8 mm, respectively. The grapevine water requirements in both regions in the forty-year period under study showed a growing tendency. A larger increase in grapevine water requirements (27.5-28.0 mm per ...
The present research has aimed at estimating the water requirements of grapevine in 2016-2050 in the Bydgoszcz region based on the anticipated temperature changes. . The paper draws on the forecasting of mean monthly temperature for the Bydgoszcz region in 2011-2050 according to the climate change scenario for Poland SRES: A1B (Bąk, Łabędzki 2014). The water requirements of the grapevine have been determined based on the indispensable precipitation determined by Kemmer and Schulz. The water requirements were calculated for the period January through December and May through September for each year in the 35-year period (2016-2050). The reference period was made up by a 35-year period immediately preceding it (1981-2015). In the 2016-2050 period in the Bydgoszcz region, in the light of the anticipated temperature change scenarios, one can expect increased grapevine water requirements. Determined with the Kemmer and Schulz method, the required optimal annual (January-December) precipitation will increase for the grapevine from 440 mm to 576 mm (by 136 mm, namely by 31 %). The optimal precipitation trend equations demonstrate that in the reference period (1981-2015), calculated with the Kemmer and Schulz, the optimal annual precipitation was increasing in grapevine in each pentad by 2.2-2.6 mm. In the forecast ...
The aim of the present research has been an attempt at evaluating the water requirements of pear trees over 2016-2050 in the Bydgoszcz region drawing on the forecast changes in temperature. The paper draws on the forecasting of mean monthly temperature for the Bydgoszcz region in 2011-2050 according to the climate change scenario for Poland SRES: A1B (Bąk, Łabędzki 2014). The water requirements of the pear tree have been determined based on the indispensable precipitation determined by Kemmer and Schulz. The water requirements were calculated for the period January through December and May through September for each year in the 35-year period (2016-2050). The reference period was made up by a 35-year period immediately preceding it (1981-2015). In the period 2016-2050 in the Bydgoszcz region, in the light of the temperature change scenarios made, one should expect an increase in the water requirements of the pear tree. Determined with the Kemmer and Schulz method, the required optimal annual (January-December) precipitation will increase for the pear tree from 624 mm to 771 mm (by 147 mm, namely by 24 %). The optimal precipitation trend equations show that in the reference period (1981-2015), calculated with the Kemmer and Schulz numbers, the optimal ...
The aim of the present research has been an attempt at evaluating the water requirements of apple trees over 2016-2050 in the Bydgoszcz region drawing on the forecast changes in temperature. The paper draws on the forecasting of mean monthly temperature for the Bydgoszcz region in 2011-2050 according to the climate change scenario for Poland SRES: A1B (Bąk, Łabędzki 2014). The water requirements of the apple tree have been determined based on the indispensable precipitation determined by Kemmer and Schulz. The water requirements were calculated for the period January through December and May through September for each year in the 35-year period (2016-2050). The reference period was made up by a 35-year period immediately preceding it (1981-2015). In the 2016-2050 period in the Bydgoszcz region, in the light of the temperature change scenarios, one could expect increased apple-tree water requirements. Determined with the Kemmer and Schulz method, the required annual (January-December) optimal precipitation will increase for the apple tree from 681 mm to 849 mm (by 168 mm, namely by 25 %). The optimal precipitation trend equations show that in the reference period (1981-2015), calculated with the Kemmer and Schulz numbers, the optimal annual precipitation for the apple tree was ...
The aim of the present research has been an attempt at evaluating the water requirements of plum trees over 2016-2050 in the Bydgoszcz region drawing on the forecast changes in temperature. The paper draws on the forecasting of mean monthly temperature for the Bydgoszcz region in 2011-2050 according to the climate change scenario for Poland SRES: A1B (Bąk, Łabędzki 2014). The water requirements of the plum tree have been determined based on the indispensable precipitation determined by Kemmer and Schulz. The water requirements were calculated for the period January through December and May through September for each year in the 35-year period (2016-2050). The reference period was made up by a 35-year period immediately preceding it (1981-2015). In 2016-2050 in the Bydgoszcz region, in the light of the forecast temperature change scenarios, one should expect an increase in the water requirements of the plum tree. The annual (January-December) optimal total precipitation determined according to the Kemmer and Schulz method will increase for the plum tree from 712 mm to 807 mm (by 95 mm, which accounts for 13%). The optimal precipitation trend equations show that in the reference period (1981-2015), calculated, drawing on the Kemmer and Schulz number, the optimal ...
The aim of the present research has been an attempt at estimating the water requirements of sweet cherry tree in 2016-2050 in the Bydgoszcz region drawing on the forecast temperature changes. The paper draws on the forecasting of mean monthly temperature for the Bydgoszcz region in 2011-2050 according to the climate change scenario for Poland SRES: A1B (Bąk, Łabędzki 2014). The water requirements of the sweet cherry tree have been determined based on the indispensable precipitation determined by Kemmer and Schulz. The water requirements were calculated for the period January through December and May through September for each year in the 35-year period (2016-2050). The reference period was made up by a 35-year period immediately preceding it (1981-2015). In 2016-2050 in the Bydgoszcz region, in the light of the forecast temperature change scenarios, one can expect an increase in the water requirements of the sweet cherry tree. Determined with the Kemmer and Schulz method, the required annual (January-December) optimal total precipitation will increase for the sweet cherry tree from 532 mm to 746 mm (by 214 mm, which accounts for 40%). The optimal precipitation trend equations show that in the reference period (1981-2015), calculated with the Kemmer and Schulz number, ...
The aim of the present research has been an attempt at evaluating the water requirements of peach trees over 2016-2050 in the Bydgoszcz region drawing on the forecast changes in temperature. The paper draws on the forecasting of mean monthly temperature for the Bydgoszcz region in 2011-2050 according to the climate change scenario for Poland SRES: A1B (Bąk, Łabędzki 2014). The water requirements of the peach tree have been determined based on the indispensable precipitation determined by Kemmer and Schulz. The water requirements were calculated for the period January through December and May through September for each year in the 35-year period (2016-2050). The reference period was made up by a 35-year period immediately preceding it (1981-2015). In 2016-2050 in the Bydgoszcz region, in the light of the forecast scenarios of changes in temperature, one should expect an increase in water requirements of the peach tree. Determined according to the Kemmer and Schulz method, the required optimal annual (January-December) precipitation will increase for peach from 486 mm to 612 mm (by 126 mm, which accounts for 26%). The optimal precipitation time variation trend equations show that in the reference period (1981-2015), calculated based on the Kemmer and Schulz number, the ...
This study examined the effect of fertilisation with compost prepared from hygienised sludge with an addition of pine-tree bark and mulching with fresh forest ectohumus on selected growth parameters for two- and three-year-old Scots pine trees and on the incidence of mites (Acari) in the soil. The experiment was carried out in 2009-2010 in the Białe Błota forest nursery (Bydgoszcz Forest District) on proper rusty soil. The entire area of the experiment was irrigated with a stationary sprinkler.Organic fertilisation with compost prepared from hygienised sludge with an addition of pine-tree bark resulted in a significant increase in the plant height and the diameter of the root neck in two-year-old pine trees. The effect of mulching on these parameters was not significant. The synergistic effect of the factors on the plant height and the diameter of the root neck was not significant. Organic fertilisation significantly increased the height of 3-year-old pine trees, whereas it did not have a significant effect on the root neck diameter. Mulching increased the plant height significantly, but no statistical effect on the diameter of the root neck was demonstrated. Although no significant interaction of either experimental factors in their effect on the plant height and the ...
This study examined the effect of fertilisation with compost prepared from hygienised sludge with an addition of pine-tree bark and mulching with fresh forest ectohumus on selected growth parameters in two- and three-year seedlings of common beech and the occurrence of mites (Acari) in soil. The experiment was carried out in 2009-2010 in the Białe Błota forest nursery (Bydgoszcz Forest District) on proper rusty soil. The entire area of the experiment was irrigated with a stationary sprinkler. The beech seedlings on the plots where compost had been used as fertiliser were significantly taller than those growing on the plots where mineral fertilisers had been applied. Mulching increased the height of the seedlings significantly only in the last, third year of the study. The tallest three-year-old seedlings were found on the plots in which both of the tested procedures had been carried out. Neither of the factors under study had a significant effect on the diameter of the root neck in the second year of the nursery cultivation, but they increased it significantly in the third year. Fertilisation with compost with an addition of pine-tree bark increased the number of leaves per plant and the leaf area in two- and three-year-old ...
The objective of the study was the comparison of optimal precipitation and deficits of atmospheric precipitation in relation to millet cultivated in the region of Bydgoszcz and Wrocław in the period 1975-2014. In the region of Wrocław water needs in millet cultivation were larger than in the region of Bydgoszcz. In the growing season (from May to August) they amounted to 253 mm and 242 mm respectively. July was the month when the largest water needs were observed - 74 and 72 mm respectively. It was also discovered that in the region of Wrocław the optimal amount of precipitation in the millet growing season (from May to August) systematically increased in subsequent decades, from 234 mm in the period 1975-1984 to 266 mm in the period 2005-2014. The correlation and regression analysis showed that the increasing trend of changes of that index in time was significant. Monthly deficits of precipitation in the millet growing season - both maximum and average - were in each case larger in the region of Bydgoszcz. The largest maximum and average insufficiencies of precipitation occurred in July. The frequency of occurrence of years with insufficient precipitation was also larger in each month in the region ...
Based on available literature, we collected and presented in tables the values of optimal precipitation (for some field-cultivated vegetables) which are still sometimes used in Poland. We also included a short summary of how they are defined and how the necessary corrections are introduced. Included optimal precipitation values have been developed by: Dzieżycet al., Grabarczyk, Klatt and Press. Therefore, it is possible to define (estimate) precipitation deficits for specific species of vegetables depending on the temperature or soil weight classification (light, medium, heavy) in various regions of Poland. By recognising optimal precipitation, we can plan, design or introduce irrigation and manage it. The formulas developed by Grabarczyk offer an additional possibility of calculating expected average increase (growth) of vegetable crops as a result of irrigation within various precipitation zones in Poland. ...
The paper describes the first attempts at the sprinkler irrigation of plants in Poland which took place in the Kujawy and Wielkopolska Region more than a hundred years ago - at the early 20th century. The first original sprinkler irrigation machine was designed and the used by Mr Władysław Szczepkowski. The sprinkler irrigation machine he constructed in 1911, after earlier a few year trials (at Łęg, the Śrem county, the Poznań Province) was the first sprinkler irrigation machine built at such a large scale in Europe. The system developed by Szczepkowski found many followers in Germany, France, England and the USA. Szczepkowski's sprinkler irrigation machine became a prototype for many later designs, e.g. the irrigation machines applied today rolled sprinkling pipelines. ...
The aim of the research has been to determine the effect of the inoculum (forest litter containing living edaphon mixed with peat) on selected plant growth parameters of white birch (Betula pendula Roth) seedlings growing with a covered root system, the mycorrhizal status as well as the abundance of the Acari in the root clump. The research was performed in 2013 at the container nursery of Bielawy (53°01'37.3"N 18°42'55.3"E), in the Forest Inspectorate of Dobrzejewice. The experiment started on May 10, seedlings were growing in containers placed on steel pallets in 2 treatments: C -control, L - 10% of additive of inoculate shredded pine forest litter. Seedlings of white birch cultivated in the treatment with addition of litter were significantly higher than those from control treatment. There were no significant differences between the diameter and the fresh mass of the the seedlings in the two treatments. The percentage of vital mycorrhizae increased slightly in the treatment with the addition of litter. The proportion of non-vital mycorrhizas was lower in the control treatment. Our results indicate that forest litter might improve environmental conditions rather by changing moisture-temperature relationships than by changing the availability ...
The study of drip fertigation of winter squash ‘Gomez' was conducted on the very light soil on the experimental field in Kruszyn Krajeński near Bydgoszcz in the years 2007 and 2008. The research was established as one-factorial, using the method of drawn blocks, in four replications. Drip fertigation (DF) as the liquid fertilization supplied nitrogen, potassium and phosphorus to the plants three times during growing season. As the control (DP), the drip irrigation combined with broadcast application was used. The potassium and phosphorus fertilization of control plots was applied before seed sawing. The nitrogen fertilization of control plots was provided in three single doses during vegetation. The liquid and powder fertilizations were performed at the same time. The complex fertilizer 'Universol Blue' (N:P:K = 18:11:18) was used. The dose of fertilizer was 3:2:3 (187.5:125:187.5 kg of NPK per ha). The irrigation was conducted using the drip line 'T-Tape'. The liquid fertilizer was mixed by the 'Dosatron' dispenser. The irrigation started when the soil water pressure, measured with the tensiometers, was near -0.04 MPa. In comparison to the control (powder fertilization), the drip fertigation (liquid fertilization) significantly increased marketable fruit yield, single fruit weight and fruit number. Most of the tested ...
The aim of the study was to determine the effect of drip irrigation on yielding of summer squash ‘White Bush' grown under conditions of two localities: Lipnik near Stargard Szczeciński (soil of quality class IVb, and of good-rye-soil-complex) and Kruszyn Krajeński near Bydgoszcz (soil of quality class V, and of weak-rye-soil-complex). The study was designed as one-factorial trial: drip irrigation as the experimental factor was considered. Drip irrigation was conducted according to soil tensiometer indications (-0.04 MPa). Both, in Lipnik as well as in Kruszyn Krajeński, drip irrigation significantly increased marketable yield of summer squash ‘White Bush'. A higher rise in yields due to irrigation was obtained in Kruszyn Krajeński than in Lipnik. Mean marketable yield of summer squash fruits in Lipnik was higher than that obtained in Kruszyn Krajeński. Drip irrigation significantly increased the single fruit weight in relation to the control, in both crop localities. The system of drip irrigation significantly affected the number of fruits per plant. Summer squash plants grown in Lipnik produced higher number of fruits, than in Kruszyn Krajeński. In addition, essential influence of drip irrigation was affirmed on chemical composition of fruits, i.e. dry matter, vitamin C, monosaccharides, saccharose, content of total sugars ...
The study was conducted in 2011-2012 by using litter bags on microplots in a forest soil under a canopy of trees, in optimal environmental conditions for most mites. The aim of the study was to analyze the colonization by mites of wood chips after application of two biopreparations containing cellulose-degrading bacteria. The experiment was conducted in the following variants: WC - control wood chips, WB I - chips after application of bacterial inoculum I (an unidentified G(-) rod-bacterium, Bacillus sp.) and WB II - chips after application of bacterial inoculum II (Streptomyces sp.). To maintain the optimum moisture level, the microplots were irrigated by means of microsprinklers. The highest average population density of mites in the two-year series of tests was found in the control chips: 42.28 individuals per 50 cm3. In the chips treated with the biopreparations, the density of these arthropods was lower, but the differences were not statistically significant. Dominant among the mites were mostly oribatid mites. Altogether, 34 species of oribatid mites were found in all the experimental variants. The most species (30) were found in the control variant, and fewer in the chips treated with the biopreparations - 27-26. Among the oribatid mites, Tectocepheus velatus ...
The aim of the study was to estimate the variability of biometric parameters in the second year of cultivation of Scots pine on the post arable ground. Planting were carried out on the basis of post arable ground located in the Faculty Agro and Hydrometeorology Observatory of the Wrocław University of Environmental and Life Sciences. Scots pine plants in the second year of cultivation increased in height from 43.1 cm to 53.39 cm, 10,29 cm, i.e. 24 % ie. The growth rate of pine was the highest in the first part of the growing season (until June 14), when the plant height increased by 7.69 cm, accounting for about 75% of the total, the annual increment in height. The second biometric parameters studied - the diameter of the trunk - increased in the second year of growing pine from 13.16 mm to 23.36 mm (by 10. 2 mm, ie. about 77 %). ...
The aim of the study was to determine the influence of drip irrigation on the nutritive value of winter squash ‘Rouge vif d'Etampes' fruits analyzed directly after the harvest and after the storage. The plants were grown on the very light soil in the region of decreased rainfall amounts during the vegetation period. The field experiment was conducted in 2007-2008 at Kruszyn Krajeński near Bydgoszcz on the soil of quality class V-VI (very weak and weak-rye-soil-complex). The field water capacity in the soil layer 0-50 cm was 57.5 mm, while the effective useful retention amounted 29.3 mm. The experiment was designed as one-factorial trial in four replications; drip irrigation as the experiment factor was applied. As the control the plots without irrigation were considered. The single plot area was 11.2 m2. The drip irrigation was conducted according to the soil tensiometer indications ( 0.04 MPa). The research material was the eatable parts of fresh fruits that were analyzed directly after the harvest and after the storage for six months at the temperature 10°C and the relative air humidity 75%. The drip irrigation performed during the cultivation of winter squash increased the content of vitamin C, total carotenoids including ß-carotene, as ...
Celem badań była ocena dynamiki wzrostu sosny zwyczajnej na gruncie porolnym w warunkach mulczowania w trzecim roku uprawy. Nasadzenie polowe przeprowadzono na gruncie porolnym zlokalizowanym na terenie Wydziałowego Obserwatorium Agro i Hydrometeorologii Uniwersytetu Przyrodniczego we Wrocławiu. Rośliny sosny zwyczajnej na gruncie porolnym w trzecim roku uprawy zwiększyły swą wysokość z 68,8 cm do 102,5 cm, tj. o 33,7 cm czyli o 49%. Dynamika wzrostu sosny była największa w pierwszej części wegetacji (do 10 czerwca), kiedy to wysokość roślin zwiększyła się o 30 cm, stanowiąc około 90 % całego, rocznego przyrostu wysokości. Drugi z badanych parametrów biometrycznych - średnica pnia - zwiększyła się w trzecim roku uprawy sosny z 28,0 mm do 39,9 mm (o 11, 9 mm, tj. o 42 %). Dynamika przyrostu średnicy pnia była odmienna od zanotowanej w przypadku wysokości roślin, bowiem w pierwszej części wegetacji sosny, w której najbardziej wzrosła jej wysokość, średnica pnia zwiększyła się tylko o 29 % rocznego przyrostu (tj. o 3,4 mm). ...
Celem badań było potwierdzenie konieczności stosowania nawadniania jako podstawowego zabiegu plonotwórczego w uprawie kukurydzy na obszarze szczególnie deficytowym w wodę, charakteryzującym się glebą bardzo lekką o podłożu przepuszczalnym oraz określenie efektywności fertygacji, w porównaniu z posypową metodą nawożenia azotem. Ścisłe doświadczenie polowe przeprowadzono w latach 2008-2010 na polu doświadczalnym Katedry Melioracji i Agrometeorologii UTP zlokalizowanym w Kruszynie Krajeńskim koło Bydgoszczy. W okresie badań wystąpiły duże potrzeby nawadniania kukurydzy, wynikające z niedostatecznej ilości i nierównomiernego rozkładu opadów atmosferycznych w poszczególnych sezonach wegetacji. Sezonowa dawka nawodnieniowa wyniosła średnio 194 mm. Wyniki badań wykazały, że uprawa kukurydzy na ziarno na obiekcie szczególnie deficytowym w wodę jest celowa tylko pod warunkiem stosowania nawadniania. Na stanowiskach nie nawadnianych plon suchej masy ziarna wyniósł zaledwie 0,87 t.ha-1, nie przekraczając w żadnym roku badań granicy 1 t.ha-1. W warunkach nawadniania kukurydza plonowała na średnim poziomie 6,55 t suchej masy ziarna z 1 ha. Systemem nawadniającym godnym polecenia w uprawie kukurydzy na ziarno jest nawadnianie kroplowe, którego jednostkowy efekt produkcyjny okazał się wyższy, w porównaniu do uzyskanego we wcześniejszych badaniach z deszczowaniem, prowadzonych na tym samym obiekcie. Ponadto system ten umożliwia fertygację, czyli zastosowanie nawozów w formie płynnej razem z nawadnianiem. Zastosowanie fertygacji kroplowej azotem, w porównaniu ...
