摘要
以云南糯稻黄壳糯和杂交稻合系41间作为研究对象,通过田间试验,根据叶绿素适时测定结果确定氮肥施用量的方法,研究了氮优化施肥对黄壳糯和合系41间作的产量和稻瘟病发生的影响。结果表明,与传统施氮(180 kg N/hm2)相比,优化施氮用量仅为150 kg N/hm2,化学氮肥施用量减少了16.7%,无论是单作还是间作,杂交水稻合系41的产量基本保持不变,而黄壳糯产量显著增加。单作条件下两个试验点分别增产380%和59%;间作条件下2个试验点分别增产1.2%和69%。优化施氮降低了水稻黄壳糯穗瘟的病情指数和发病率,单作条件下两个试验点较传统施肥分别下降13.4%,0.4%和40.6%,6.1%;间作条件下两个试验点较传统施肥分别下降34.8%,15.5%和44.3%,27.7%。
Field experiments were carried out to investigate effects of N optimized application on rice yields and rice blast under different rice cuhivars （Huangkenuo -susceptible, and Hexi -41 -resistant） intercropping. The optimized N rate were determined and applied according to chlorophyll contents measured instantly in situation. The results showed that in comparison with traditional N application （180 kg/hm^2）, the amount of N with optimized application （150 kg/hm^2） was reduced by 16. 7%, while the same yield of Hexi -41 and significant higher yield of Huangkenuo were obtained under both monocropping and intercropping. The yields of Huangkenuo with optimized N application increased by 380% and 59% under monocropping, and 1.2% and 69% under intercropping, compared with traditional N application in 2 experimental sites. The disease index and incidence of panicle blast of Huangkenuo were also decreased by 13.4% and 0. 4% respectively at site 1 and 40.6% and 6. 1% respectively at site 2 with N optimized application under monocropping. With intercropping, the disease index and incidence of panicle blast decreased 34.8% and 15.5%, respectively at site 1, and 44. 3 % and 27.7 %, respectively at site 2.
出处
《云南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第1期82-86,共5页
Journal of Yunnan Agricultural University:Natural Science
基金
国家科技计划"973"前期研究专项(2008CB117011)
关键词
水稻间作
氮优化
产量
稻瘟病
rice intercropping
N optimized application
yield
rice blast
