The influence of fertilization, site and year on the yield and qualitative parameters of potatoes
1990
Lahky, J. (Ustredny Kontrolny a Skusobny Ustav Polnohospodarsky, Bratislava (CSFR))
Three-year trials were performed at three sites to study the effect of gradated and divided nitrogen application rates (0, 60, 120, 180, 240, 90 + 37 kg per ha) and fertilizers with microelements (Mn-humate, Foli-potatoes - Mg, S, Mn, Cu, B) on the potato yield, their starch content and size classification. The influence of soil and weather conditions on the evaluated parameters was also studied. The potato yield formation is affected by nitrogen ferilization to the highest degree. The effect of soil conditions is mediocre, and the influences of the year is the lowest. On the average of the set, the optimum nitrogen application rate taged between 120 and 180 kg per ha, applied on a single date before planting. The differences in starch formation are most significantly affected by different conditions of the year and site. The effect of fertilization is of lower importance. The optimum nitrogen application rate is 60 kg per ha form the view point of the starch content. Higher rates reduce its content. The size classification of potatoes is largely affected by soil and climatic conditions. The effect of nitrogen application rate is significantly lower and gradated nitrogen application rates produced a smaller proportion of small-size tubers. The effectiveness of nitrogen fertilization as well as supplementary nitrogen dressing, and the effectiveness of the tested fertilizers with microelements on the evaluted parameters, significantly depends on the soil conditions and the climatic conditions of the year. The nutrition measurements, therefore, cannot be generalized.
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