关键词: 水稻, 水稻, 氮素含量, 氮素积累量, 组织器官, 氮素利用效率

Abstract:

Based on the systematic survey and disease investigation of Rape Sclerotinia stem rot from 1998 to 2008 in Nanchong, the single-year prevalence could be caused by the cardinal number of sclerotia from Sclerotinia sclerotiorum , and the optimum infection period of ascospore was 18~25days. The suitable weather conditions were the decisive factors of the serious disease. According to the meteorological factors in the past eleven years from February to April , three mathematical models had been established and achieved good test results. The mathematical models respectively related to the area ratio of ultimate incidence in stem, the diseased plant rate of stem disease and the final disease index. Utilizing lightened and simplified disease-control cultivation measures such as straw mulching, appropriate adjustment of sowing and transplanting period, the effect of integrated control on Rape Sclerotinia stem rot could reach more than 50%. The drug-resistance of Sclerotinia sclerotiorum to carbendazim wasn’t obvious yet on local. When applied with 50% carbendazim at 100g/667m2 twice in field, the control effect was over 85%.