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以超级杂交晚稻丰源优299为材料,研究不同施氮量处理对超级杂交晚稻丰源优299分蘖动态、分蘖速率、叶面积指数、产量、谷草比、氮肥利用率和经济效益的影响,从而得出经济施氮量和生态施氮量。结果表明超级杂交晚稻丰源优299在施纯氮180.00 kg/hm2时,在移栽后8d分蘖速率46.80万/hm2.d、产量7.30 t/hm2、谷草比1.34、纯收入4804.50元/hm2,以上指标均最高,均显著高于其他处理;在施纯氮量为135.00 kg/hm2时,成穗率和孕穗期叶面积指数分别为59.93%和6.78,均显著高于其他处理,成熟期叶面积指数2.43、产量6.89 t/hm2、纯收入4637.70元/hm2、氮肥偏生产力52.54 kg/kg N、氮肥农学利用率22.94 kg/kgN,表现均较高,因此,超级杂交晚稻丰源优299最佳施氮量是农民习惯施氮量纯氮180.00 kg/hm2,也是最经济施氮量,而最生态施氮量为农民习惯施氮量减少25%,为135.00 kg/hm2纯氮。
The effect of different nitrogen application rates on tillering dynamics, tillering rate, leaf area index, yield, grain-straw ratio, nitrogen use efficiency and economic benefit of super-hybrid late-maturing Fengyouyou 299 was studied with Fengyou 299, a super hybrid late rice variety. Obtained economic nitrogen fertilizer and ecological nitrogen. The results showed that when the super hybrid late rice Fengyuanyou 299 applied pure nitrogen 180.00 kg / hm2, the tillering rate was 46800 / hm2, the yield was 7.30 t / hm2, the ratio of straw to straw was 1.34 and the net income was 4804.50 yuan / hm2 at 8 days after transplanting. The above indexes were the highest, which were significantly higher than other treatments. The leaf area index of spike rate and booting stage were 59.93% and 6.78, respectively, at the nitrogen level of 135.00 kg / hm2, which were significantly higher than those of other treatments The area index was 2.43, the yield was 6.89 t / hm2, and the net income was 4637.70 yuan / hm2. The partial productivity of nitrogen fertilizer was 52.54 kg / kg N, and the utilization rate of nitrogen fertilizer was 22.94 kg / kgN. The best nitrogen rate was 180.00 kg / hm2 for peasants who habitually applied nitrogen and the most economical nitrogen, while the most applied nitrogen was reduced by 25% for peasants’ habit of applying nitrogen and 135.00 kg / hm2 of pure nitrogen.