氮优化措施对间作水稻(黄壳糯、合系41)产量和稻瘟病发生的影响

 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（180kg N/hm²）相比，优化施氮用量仅为150kg 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%。

Effects of Optimized Nitrogen Application on Rice (Huang Kenuo and Hexi 41 ) Yield and Rice Blast under Intercropping

Field experiments were carried out to investigate effects of N optimized application on rice yields and rice blast under different rice cultivars (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/hm²), the amount of N with optimized application (150kg/hm²) 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.