The influence of mineral fertilizers on the productivity and quality of spring rape oilseeds
2008
Borovko, L., Latvia Univ. of Agriculture, Skriveri, Aizkraukle reg. (Latvia). Agency Research Institute of Agriculture
The field trials were aimed at both determining the role played by nitrogen and potassium fertilizers in the increase of the spring oilseed yields and seed quality. The effect of growing rates of potassium fertilizer (K0; K80; K120; K160) upon the yield and quality of spring rape was tested at two nitrogen levels (N80 and N80+40). The results of 2005-2007 show that nitrogen and potassium fertilizers on background P60 provided the seed yield 1.76 - 2.60 t haE-1. Introduction of nitrogen 80-120 kg ha 1 resulted the yield increase 0.49-1.09 t haE-1. On nitrogen and phosphorus background N80P60 when increasing the norms of potassium from K80 to K160 there was obtained essential yield increase - 0.49=0.911 haE-1. On the background of N120 P60 the changes within the variants were not essential, but in comparison with control there was obtained the yield increase 1.22 - 1.33 t haE-1. Applying NK fertilizer within spring rape sowings the oil content within seed depending on the applied fertilizer norm was 46,92-48,89% and protein content - 21.12-23.12%. On the backgrounds of nitrogen and phosphorus N80P60 and N120P60higher oil content 48.89% and 48.22% was provided by K160 norm.
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