不同总氮占比穗肥对水稻产量的影响

在黔东南地区进行水稻增产氮肥施用技术的田间试验,对不同总氮占比穗肥对水稻产量的影响进行了研究。结果表明,水稻孕穗期施用氮肥能使植株生长旺盛,有效穗和成穗率增加,总粒数增多,产量增加19.9-47.9kg/667m^2,增幅达3.5%-8.4%。施氮占比为15%和20%时,增产效果较好,与不施氮对照相比,差异达显著水平。但与对照相比,各处理病虫害发生略有加重,结实率略为减少,生育期稍有延长,并随着穗肥施氮占比的增加而有所加重。应根据不同气候、土壤以及产量水平,确定最佳氮肥施用总量,在孕穗期选择适宜的总氮施用比例,适当提早施用氮肥。

Influence of Panicle Fertilizer at Different Total Nitrogen Ratio on Rice Yield

In order to explore the rice N fertilizer application technology, guide the agricultural production, it designs tests under purified N as 7.5kg/667m2 and panicle fertilizer with Total N ratio as 6 factors of 0%, 5%, 10%, 15%, 20%, 25%. The result shows that： During Rice Booting Stage implying N fertilizer the rice grows strongly, effective panicles and Earbearing Tiller Rate increase and grains increase. It shows that in area of 667m2 the yield increases 19.9kg to 47.9kg with growth of 3.5% to 8.4%. During the results, ratios of N as 15% and 20% have the better yield. They have significance levels than contract as N ratio of 0%. However during implying panicle fertilizer, the pest situation went worse, Seed setting rate slightly reduced and Growth period extend slightly with increase of N ratios. It considers it as the key factors of technology for rice yield to verify the optimum quantity of N fertilizer and during Rice Booting Stage to grasp the quantity and ratio of N fertilizer and to imply N fertilizer earlier and properly.