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在施用等量厩肥、磷肥和钾肥的基础上,每小区1公斤尿素(相当于每公顷300公斤)按照由不同生育期分次施肥的四种组合形式施用于杂交稻。其中以70％尿素为基肥,30％为保花肥的处理稻谷产量最高,每公斤尿素氮增产稻谷11.35公斤。杂交稻分蘖阶段和孕穗后期土壤供氮低于作物需氮量,上述配比形式能弥补这两个阶段土壤供氮之不足,适合杂交稻分蘖成穗能力强和穗分化力强的特点。对杂交稻和常规稻的某些氮素营养特点进行比较:(1)两者生产1000公斤稻谷的需氮量相近;(2)杂交稻吸收氮素总量中约35％来自化肥氮,与双季早稻相近而高于单季晚稻;(3)杂交稻生育期内吸收的土壤氮量与单季晚稻相近而比双季早稻高得多。
On the basis of using the same amount of manure, phosphate fertilizer and potash fertilizer, 1 kg of urea per plot (equivalent to 300 kg per hectare) is applied to the hybrid rice in four combinations of different fertilization stages. Among them, 70% of urea was the base fertilizer, 30% of the flower fertilizer treatment of the highest yield of rice, urea nitrogen yield of 11.35 kg per kg. The nitrogen supply at the tillering stage and the booting stage of hybrid rice was lower than the nitrogen requirement of the crop. The above-mentioned compounding forms could make up for the lack of nitrogen supply in these two stages and was suitable for tillering ability and spike differentiation of hybrid rice. Some characteristics of nitrogen nutrition of hybrid rice and conventional rice were compared: (1) Nitrogen demand of 1000 kg rice was similar; (2) About 35% of the total N uptake by hybrid rice came from fertilizer nitrogen, The double-crop early rice is similar to and higher than the single-crop late rice. (3) The soil nitrogen uptake during the hybrid rice growth period is similar to single-crop late rice but much higher than that of double-crop early rice.