The field experiment was conducted in the years 2006–2008 at Plant Breeding and Acclimatization Institute, Division Jadwisin on the light and acid soil. The aim of the research was to compare tubers yield, their structure and some quality elements of tubers (content of nitrates and starch, percentage of de-formations, green tubers, common scab infection) different fertilization doses of solid and liquid nitrogen form (fertigation) applied to the soil. The objects were divided on: irrigated and non irrigated. Drip irrigation method was applied in this experiment. The nitrogen dose in fertigation form was established by using com-puter program DSS (Decision Support System). The nitrogen in fertigation form was applied in following doses: year of 2006 – 57,7 kg•ha-1, year of 2007 – 31,7 kg•ha-1, year of 2008 – 39,7 kg•ha-1. The doses of water (year of 2006 – 110,3 mm, year of 2007 – 20,0 mm, year of 2008 – 68,9 mm) and dates of their application were established by using tensjometer. The control was object without fertiliza-tion of NPK and without irrigation. The significant highest yield of tubers was obtained on the irrigated object where dose of 150 kg•ha-1N was applied. The yield of tubers on irrigated object ...
The experiment was conducted was in the years 2005-2007 on the very light soil in Kruszyn Krajeński near Bydgoszcz. The influence of sprinkler irrigation and the differentiated nitrogen fertilization on yields of early potato cv. ‘Dorota' was studied. This experiment was established as a two-factorial trial. The first-row factor was sprinkling irrigation applied in two variants: W0 - without irrigation (control), W1 - sprinkling irrigation. The second row factor - differentiated nitrogen fertilization, was used in the four following variants (doses): N0 = 0 kg N•ha-1, N1 = 40 kg N•ha-1, N2 = 80 kg N•ha-1, N3 = 120 kg N•ha-1. Potatoes were fertilized with the full dose of manure, the fertilization with P and K was uniform on all the plots, and it was applied in relation to the soil fertility. The mean yield harvested on control plots (without irrigation) amounted on average 14,41 t•ha-1. Smaller yields, in range 8,75-11,83 t•ha-1, were noted in the first two years of study which were characterized by lower rainfall (161-230 mm), higher yields (22,66 t•ha-1) - in year 2007 that was characterized by the highest rainfall (323 mm) in the vegetation period of the potatoes. The use of irrigation significantly increased ...
