摘要:随着机插秧、稻麦两熟在长江中下游地区的推广,农民为了追求高产,增加经济效益,不断扩种偏晚熟品种,间接的导致长江中下游地区水稻生育期推迟,随着近年来后期低温冷害天气频发,导致灌浆不足,影响水稻产量。本文以镇稻18为实验材料,设置不同的氮素和播期处理,考察了氮素对播期推迟下水稻的生长发育及产量的影响。结果表明正常播期施氮产量最高,相同播期下,氮素可以提高有效穗数和穗粒数,但施氮处理的结实率会显著低于不施氮处理;施氮对正常播期和迟播处理的产量作用相反,晚播施氮导致灌浆严重不足,结实率显著下降,产量较低。28123 毕业论文关键词:水稻;氮素;播期;灌浆
Effects of Nitrogen on Grain Filling of Late Japonica Rice and Its Mechanism
Abstract:As the machine planting, rice cooked in the middle and lower reaches of the Yangtze river region, two farmers in pursuit of high yield, increase economic efficiency, late varieties plant expanding unceasingly, rice growth period delay indirectly lead to the middle and lower reaches of the Yangtze river region, with frequent late low-temperature chilling injury weather in recent years, causing shortages of grouting affect rice yield.Based on the town 18 rice as experiment material, set different nitrogen and sowing date processing, examines the sowing date delaying of n under the influence of the growth and yield of rice.Results show that the normal sowing time n the highest yield, under the same sowing date, nitrogen can improve the effective number of ears and grains, but nitrogen treatment of seed setting rate will be significantly less nitrogen;Nitrogen for normal sowing date and late planting processing production function, in contrast, late time n application led to a serious shortage of grouting, seed setting rate dropped significantly, yield is low.
Key words: Rice;Nitrogen;Date of seeding;Grain filling
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