超级杂交晚稻丰源优299经济施氮量和生态施氮量研究

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。

Research of Economic Application Amount of Nitrogen Fertilizer and Ecological in Super Hybrid Late Rice Fengyuanyou 299

Super hybrid late rice Fengyuanyou 299 were used to investigate their effective of the numbers of tillers, the speeds of tillers, leaves area index, yields, ratios of grain to straw, nitrogen use efficiency and economic results under different slow-release nitrogen fertilizer. The results showed that: under 180.00 kg/hm² pure nitrogen, the speed of tillers after transplanted 8 days were 46.80×104/hm²·d, yield was 7.30 t/hm², the ratio of grain to straw was 1.34 and economic result was 4804.50 yuan/hm², their were all respectively extreme significantly highest than other treatments of super hybrid late rice Fengyuanyou 299. Under 135.00 kg/hm² pure nitrogen, percentage of ear bearing tiller and leaf area index of booting stage were 59.93% and 6.78, extreme significantly highest than other treatments; the leaf area index of maturation stage was 2.43, yield was 6.89 t/hm², economic result was 4637.70 yuan/hm², partial factor production of applied was 52.54 kg/kg N and agronomy efficiency was 22.94 kg/kg N, and their were higher. The results presented the economically and ecologically appropriate amount of nitrogen fertilizer of super hybrid late rice Fengyuanyou 299 were 180.00 kg/hm² and 135.00 kg/hm² of pure nitrogen.