摘要
通过设置4个不同氮肥水平的田间试验,结合室内分析,研究了不同施氮量条件下湘南地区双季稻的农艺性状以及氮肥利用率。结果表明:增施氮肥可提高早稻的有效穗数和每穗的总粒数,而实粒数、结实率、千粒重有降低的趋势;晚稻增施氮肥使得有效穗数、结实率和千粒重有所降低,每穗的总粒数增加。增施氮肥可提高早稻产量和纯收入,早稻最高产量施氮量和最高经济施氮量分别为240.7 kg/hm2、220.1 kg/hm2。晚稻则随着氮肥用量的增加而逐渐降低,以减氮处理最高,晚稻最高产量施氮量和最高经济施氮量分别为122.3 kg/hm2、104.2 kg/hm2。增施氮肥可提高早稻的氮肥吸收利用率,对晚稻的氮肥吸收利用率影响不明显。
By setting four different nitrogen levels for field trials and combining with laboratory analysis,the agronomic traits and nitrogen use efficiency of double-cropping rice under different nitrogen fertilizer rates in southern Hunan were researched.The results showed that increasing nitrogen fertilizer rate for early rice can increase effective panicle number and total grain number per panicle,but filled grain number,seed setting rate,1 000 grains weight had the decreasing tendency;increasing nitrogen fertilizer rate for late rice decreased effective panicle number,seed setting rate and 1 000 grains weight,but increased total grain number per panicle.Increasing nitrogen fertilizer rate can increase yield and net income of early rice,of which the highest yield and economical nitrogen fertilizer rate were 240.7 kg/hm^2 and 220.1 kg/hm^2 respectively;the yield and net income of late rice decreased with increasing nitrogen fertilizer rate,of which the highest in nitrogen reducing treatment,and the highest yield and economical nitrogen fertilizer rate were 122.3 kg/hm^2 and 104.2 kg/hm^2 respectively.Increasing nitrogen fertilizer rate also can increase nitrogen absorption and use efficiency of early rice,but had no significant effect on nitrogen absorption and use efficiency of late rice.
出处
《湖南农业科学》
2011年第7期70-73,共4页
Hunan Agricultural Sciences
基金
国家水稻产业体系专项(NYCYTX-01)
关键词
施氮量
水稻
农艺性状
氮肥利用率
nitrogen fertilizer rate
rice
agronomic traits
nitrogen use efficiency
