氮、钾施用量对中粳稻群体质量和产量的影响

以中粳品种"皖稻68"为材料,研究氮、钾施用量对单季中稻群体质量和产量的影响.结果表明,在施氮量为262.5 kg/hm2和施钾为375.0 kg/hm2时产量最高,达11211.1 kg/hm2.水稻的总茎蘖数、叶面积指数、干物质积累量、有效穗数和每穗粒数随着施氮量的增加而增高,而分蘖成穗率、有效和高效叶面积率、抽穗后干物质生产积累量和总颖花量以施氮量为262.5 kg/hm2为最高,进一步增施氮肥则下降,不利于群体质量的提高.钾肥对水稻的有效穗和穗粒数影响不大,但能提高结实率和千粒重,随着施钾量的增加,穗下节间长度占株高的比例增加,有利于提高植株抗倒性,而抽穗后干物质生产积累量也随着施钾量的增加而增加,水稻的群体质量得到优化,产量有增高的趋势,但是不显著.

Effect of Nitrogen and Potassium Fertilizer Application Amount on the Population Quality and the Yield of Single Cropping Medium Rice

Effect of N and K fertilizer application amount on the population quality and the yield of single cropping medium rice were studied using medium japonica wandao 68 as materials and establishing different N and K fertilizer application amount.The results show that when the grain output of amount of N and Kcl applied was262.5kg/hm2 and 375.0kg/hm2,the yield was 11211.1kg/hm2 was tiptop.The total tillers ,LAI, dry matter accumulation and the yield components were very significantly increased in pace with increasing N application amount,but the grain output of amount of nitrogen applied was262.5kg/hm2 was tiptop on spiking rate of tillers,percentage of effective and high effective LAI,dry matter after heading and total spikelets. K fertilizer on rice panicle and grain per spike few little effect on the firm can increase the seed-setting rate and 1000-grain weight,with the increase in K application amount, Percentage of the toppest joint and panicle lengh to plant height and production on dry matter after heading were increased and was conductive to raising lodging of plants,the population quality of the rice and yield were increased ,but not significant.