一、减产原因1 .基本苗不足　塑盘旱育秧易发生高温灼芽、失水青枯和病害死苗现象 ,空穴率较高 ;秧苗营养面积和空间窄小 ,单株分蘖较少。大田抛植面积又以盘计数 ,造成基本苗不足 ,够苗期推后 ,烤田相应推迟 ,产生大量的迟生分蘖 ,小穗增多 ,中大穗比例减少。据调查 ,抛植田比 First, the reasons for the reduction 1. The lack of basic seedlings Plastic disc dry nursery seedlings prone to high temperature burning buds, dehydration and the phenomenon of withered seedling dead blight, a higher porosity; seedling nutrient area and space is narrow, fewer tillers per plant. In addition, the area planted in the field was counted by disk, resulting in lack of basic seedlings. After the seedling stage was delayed, the amount of seedling delayed correspondingly, resulting in a large number of late-growing tillers, spikelets increased, and the ratio of middle-big ear decreased. According to the survey, throwing Tian than