Abstract:

The study researched the effect of fertilization and the proportion of nitrogenous fertilizer on the nutrient absorption and output of the hybrid rape by field experiments and analytical testing. The research revealed that fertilization can promote nutrient and potassic absorption of the hybrid rape’s straw, seeds and plants, most of which was taken up by seeds. The proportional application of nitrogenous, phosphatic, potassic and boron fertilizers (dealt with NPK) led to the average output of 1851.7 kg/hm2 and the increase rate was 34.81%, 25.40%, 17.91% and 9.34% compared with the way dealt with PKB、NKB、NPB and the peasants’ tradition, increasing the net benefit by 1797.39 yuan/hm2, 1550.00 yuan/hm2, 966.60 yuan/hm2, 1486.74 yuan/hm2. The efficiency of fertilizers were in order of nitrogen＞phorsphor＞potass, while the effect of zinc fertilizer was invisible. The dosage of nitrogenous fertilizer was positively connected with the output of rape seeds which increased by 26.52%-68.10% with nitrogenous fertilizer. While with the increase in the usage of nitrongenous fertilizer, the utilization ratio of which and agricultural benefit would decrease. The economical consumption of nitrogenous fertilizer was N 180.0 kg/hm2, where the utilization rate of nitrogenous fertilizer was 29.19% and the agricultural benefit was 3.58 kg/kg.