The work presents the results of investigations conducted in 2004-2007 to evaluate the residual effect of summer catch crops ploughed as green manures on productive-economic effects of sweet corn cultivation. The experiment was carried out in east-central Poland (52°03'N, 22°33'E). The following summer catch crops were grown: phacelia, amaranth, sunflower, serradella and faba bean. The catch crop seeds were sown in 2004-2006 at three dates: on the 21stJuly, 4th and 18th August. The effect of summer catch crops was compared to FYM applied at the rate of 40 t•ha-1. The catch crops biomass (roots + above ground parts) and FYM were incorporated in the third decade of October. Sweet corn seeds (6 kg•ha-1) were sown in mid-May, in the years 2005-2007, at the between- and inter-row spacing of 65 × 20 cm. Sweet corn ears were hand-harvested at the stage of milk maturity of kernels, at the turn of August and September. During the harvest marketable yield of ears (t•ha-1) and number of marketable ears per 1 ha were determined. Economic evaluation of sweet corn cultivation under diversified organic fertilization was conducted according to the standard gross margin method. The calculation was based on the 2014 prices. The highest yield ...
A field experiment was carried out from 2007-2009 at the University of Natural Sciences and Humanities greenhouse complex in Siedlce. The trial was set up as randomized blocks with three replications. In the experiment was investigated the effect of method of AgroHydroGel application (control, AgroHydroGel applied under seedlings, AgroHydroGel applied under plants in the field, half of the AgroHydroGel rate applied under seedlings, the other half under plants in the field) and cultivar (‘Gabi', ‘Delikates Biała', ‘Wiedeńska Biała') on the yield level and quality of kohlrabi grown in the field under the weather conditions of central-eastern Poland. Kohlrabi seedlings were grown in a non-heated greenhouse. The seeds each cultivars were sown in late March to seedling containers with peat substrate amended with AgroHydroGel or peat substrate only. The kohlrabi was harvested two times at 7-10 days intervals, at a minimum bulb diameter of 3 cm. The beginning of harvest was after 50-51 days from the planting of seedlings. There was found that weather conditions in the study years had significant influence on the yield level, average weight and bulb diameter as well as on the nutrient contents in the kohlrabi bulb. The most favourable on the increase of yield of ...
