Application quantity of multi-nutrient and long-effect special fertilizer for rapeseed.

Field trials in two sites were conducted to study the effect of special fertilizer for rapeseed on the growth, yield, nutrient uptake and nutrient recovery efficiency. Results showed that application of multi - nutrient and long - effect special fertilizer for rapeseed promoted growth significantly. Plant height, stem diameter, SPAD value, branch number and dry weight of individual plant increased by 30. 1%, 72.7%, 162.2%, 31.0% and 130. 1% respectively, compared to that of no fertilizer control. Significant linear and platform correlations had been shown between yield and fertilizer quantity. Proper fertilizer increased yield significantly, for it promoted branch number and - number. Results also showed that dry matter and N, P₂O₅ and K₂O uptake by rapeseed were all improved significantly after using the special fertilizer, although the nutrient recovery efficiency decreased gradually when fertilizer quantity increased. The average N, P₂O₅ and K₂O recovery efficiency on two experimental sites were 37.0%, 33.5% and 75.6% respectively when fertilizer quantity was 1 125kg/hm². It could be calculated that the appropriate quantity of multi - nutrient and long - effect special fertilizer for rapeseed was 1 200 to 1 275 kg/hm² to target yield of 2 700 to 3 000kg/hm². [ABSTRACT FROM AUTHOR]