摘要
针对目前湖南部分地区水稻生产中氮肥施用过量的问题,以湘晚籼12号为试验材料,设置以施氮量为主区、抛栽密度为副区的裂区试验,分析两因素及其互作对晚稻生产的影响。结果表明:施氮量与抛栽密度的交互作用不显著,但对水稻产量有较大影响;在施氮量9 kg/667m^2、抛栽密度2.6万株/667m^2模式下,晚稻理论产量最高,为572.29 kg/667m^2;通过二次多项式回归分析施氮量、抛栽密度密度与产量间的关系可知,产量最高为562.26 kg/667m^2时,对应的施氮量为10.33 kg/667m^2、抛栽密度为2.6万株/667m^2,比常规施氮量节省13.92%。这说明合理减少氮肥用量、提高抛秧密度可实现水稻稳产、氮肥高效利用。
In order to solve the problem of excessive nitrogen application in rice production in some areas of Hunan Province,a split-plot design was conducted by using the late rice cultivar Xiangwanyan No.12 as the test material,nitrogen application level as the main factor,and planting density as the secondary factor,influences of two factors and their interactions on late rice production were analyzed.The results show that nitrogen application level and transplanting density have great influence on rice yield,but the interaction between nitrogen application level and transplanting density is not obvious.Under the nitrogen application rate of 135 kg/hm^2 and the planting density of 390000 plants/hm^2,the highest theoretical yield was 8584.35 kg/hm^2.Through the quadratic polynomial regression analysis of the relationship between nitrogen application rate,planting density and grain yield,it indicated that when the highest yield was 8433.9 kg/hm^2,the corresponding planting density was 390000 plants/hm^2 and nitrogen application rate was 154.95 kg/hm^2,13.92%less than the conventional nitrogen consumption.The above results show that reasonablely reducing nitrogen consumption and increasing planting density can not only achieve stable rice yield but also increase the nitrogen utilization rate.
作者
匡炜
方宝华
李超
刘洋
朱国奇
戴力
张玉烛
KUANG Wei;FANG Bao-hua;LI Chao;LIU Yang;ZHU Guo-qi;DAI Li;ZHANG Yu-zhu(Hunan Province Rice Research Institute,Changsha 410125,PRC;Key Laboratory of Indica Rice Genetics and Breeding in the Middle and Lower Reaches of Yangtze River Valley,Ministry of Agriculture,Changsha 410125,PRC;Hunan Province Soil and Fertilizer Research Institute,Changsha 410125,PRC;Hunan Hybrid Rice Research Center,Changsha 410125,PRC)
出处
《湖南农业科学》
2020年第3期14-16,19,共4页
Hunan Agricultural Sciences
基金
十三五粮食丰产增效科技创新项目(2016YFD0300507、2017YFD0301505)。
关键词
增苗节氮
互作效应
晚稻
生物学特性
产量
reducing nitrogen consumption and increasing planting density
interaction effect
late rice
biological characteristics
yield
