The aim of the study was to determine the effect of supplementary irrigation and nitrogen fertilization and storage on chosen parameters of chemical composi-tion of early potato cultivars. Field experiment was carried out at Kruszyn Krajeń-ski nar. Bydgoszcz in 2005-2007 on the very light soil. The experiment was estab-lished as the three-factorial trial with three replications. The first order factor were cultivars – ‘Dorota’ and ‘Gracja’, the second order factor was sprinkler ir-rigation applied in two variants: W0- without irrigation (control), W1 - sprinkler irrigation according to indications of tensiometers (the soil water potential higher than -0,03 MPa). The third order factor was differentiated nitrogen fertilization: N0 = 0 kg N∙ ha-1 , N1 = 40 kg N∙ ha-1, N2 = 80 kg N∙ ha-1 , N3 = 120 kg N ∙ha-1. It was found that the dry matter and starch content was significantly differ-entiated for the investigated cultivars, irrigation and nitrogen doses, after harvest and after storage. Irrigation decreased significantly the content of dry matter and starch as well as this factor increased slightly the content of vitamin C, reduc-ing sugars and total sugars. Increasing nitrogen doses (to 80 kg N∙ ha-1) caused the significant increase of ...
The purpose of the study was to determine of influence of irrigation and ni-trogen fertilization on the amount of losses after the storage of early potato culti-vars during 6 months. Investigations were carried out in 2005–2007 in Kruszyn Krajeński near Bydgoszcz on the soil included to the weak rye complex of agricultural suitability. The experiment was conducted as 3-factorial trial, with three rep-lications. The first row factor was early potato cultivar: ‘Dorota’, ‘Gracja’. The second row factor was sprinkler irrigation applied in two variants: Wo – without irrigation (control), (kontrola), W1 – sprinkler irrigation according to indications of tensiometers (irrigation was started when the soil water potential achieved -0,03 MPa). The three row factor was differentiated nitrogen fertilization: N0 = 0 kg N•ha -1, N1 = 40 kg N•ha -1, N2 = 80 kg N•ha -1, N3 = 120 kg N•ha -1. The studied cultivars were characterized by differentiated susceptibility to losses total during the storage. cv. ‘Dorota’ was characterized by the higher losses during the long storage. Irrigation during the vegetation period increased in tubers the amount of natural losses, decrements and the losses caused by sprouting. Nitrogen fertilization of the higher doses as well as in control ...
The aim of the study was to determine the effect of drip irrigation and microsprinkler irrigation on the content of starch, total sugars (including reducing sugars) in tubers of chosen potato cultivars after harvest and after storage during 6 months. Experiments were carried out in 2001–2003 at Kruszyn Krajeński near Bydgoszcz on the soil include to VI – quality class and 7 – complex of agricultural suitability (very weak rye complex). The soil was characterized by the very low silt and clay fraction content in topsoil (7%) and subsoil horizon (3–5%). The value of pH in 1n KCl was slightly acidic, and the abundance of basic macroelements was on the average level. The experiment included three factors: A – irrigation (with-out irrigation – control plots, drip irrigation, micro-sprinkler irrigation), B – cuti-var (‘Barycz’, ‘Mors’, ‘Triada’), C – storage (after harvest – control, after storage during 6 months). Three replications were applied. Drip irrigation was applied using ‘T-Tape’ drip lines (in-line emitters spaced 20 cm apart). The single drip line was located between two neighbouring rows of potatoes. The single emitter’s output amounted on average 0,6 l h-1. Micro-jet irrigation was done with the use of micro-jets ...
The aim of this study was to analyze the effect of the use of an agent inhibiting ethylene release - 1-Methylcyclopropene in the storage of selected apple varieties 'Szampion', 'Gloster', 'Elstar', 'Ligol', 'Idared', 'Jonagold', and 'Honeygold' originating from orchards of the Fruit Plant in Wtelno and stored in chambers with a controlled atmosphere. Laboratory analyzes were performed immediately after harvest and after 6 months of storage in chambers under ULO conditions (<2% O2, <2% CO2) at a tem-perature of 1.5-2.0°C and relative air humidity of 95-96%. Fruits treated with 1-MCP were characterized by significantly lower losses of bioactive compounds, especially vitamin C, compared to untreated apples. The contents of total polyphenols and chlorogenic acid remained at a similar level as after harvest in untreated apple samples. After the storage peri-od, the 'Szampion' variety contained significantly the most polyphenolic compounds, and the least - the 'Honeygold' variety, where the highest de-crease was also recorded during storage (26.7%) in fruits not treated with 1-MCP. After storage, the 'Ligol' and 'Elstar' cultivars had the significant-ly highest content of chlorogenic acid. The highest losses of chlorogenic acid during apple storage (32.4%) were observed in the 'Honeygold' vari-ety. The lowest loss of ascorbic acid during ...
