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根据品种遗传背景的差异、农艺性状和经济性状的不同 ,笔者选用了 2个汕型杂交稻品种 (汕优 6 3和汕优 2 2 )和 2个优质地方稻品种 (黄壳糯和紫谷 )进行了品种多样性混合间栽和不同品种净栽的田间试验。结果表明 ,汕型杂交稻与优质地方稻品种混合间栽比同一品种净栽对稻瘟病有极为显著的控制效果 ,尤其突出的是混合间栽中高度感病的优质地方稻品种对稻瘟病的发病率、病情指数均有极显著的下降 ,防治效果达 83%～ 98%。因此 ,合理的品种多样性混合间栽是水稻品种稻瘟病控制的有效途径。试验还证明 ,品种混合间栽与品种净栽相比具有明显的抗倒伏和增产效果 ,品种混合间栽比净栽杂交稻平均增产 6 .5 %～ 9.7%。
According to the difference of genetic background, agronomic traits and economic traits, the authors selected two Shantou hybrid rice varieties (Shanyou 63 and Shanyou 22) and two high-quality local rice varieties (Huanghuanuo and Zigu ) Conducted a field trial of mixed variety and intercropping and net cultivation of different varieties. The results showed that hybrid rice of Shantou type hybrid rice and high quality local hybrid rice had a significant control effect on rice blast than the same variety of net plant, especially the hybrid rice was highly susceptible to rice blast Incidence, disease index have a very significant decline in control effect of 83% to 98%. Therefore, reasonable species diversity interplanting is an effective way to control rice blast disease. The experiment also proves that the intercropping of cultivars has obviously lodging resistance and yield increasing effect compared with that of net cultivar. The intercropping of intercropping of cultivars increased by 6.5% ~ 9.7% on average compared with that of net hybrid rice.