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近年来春性较强的大小麦品种种植面积逐年增加,在大小麦生产中占有很大比重。由于温室效应所引起的冬季气温明显增高,大小麦发育加快,齐穗期普遍明显提早。1996年～1997年稻田三熟制大麦于3月10日～15日齐穗、比正常齐穗期提早半个月以上,稻田三熟制小麦一般也于3月20日～25日齐穗,比正常齐穗期提早10天以上。由于气温偏低特别是强寒潮袭击,大小麦齐穗后半个月左右才工花。这时花粉粒和柱头活力受到严重影响,受精率和结实率严重降低。 为了解决近年来大小麦结实率普遍偏低的问题,1997年冬播时,新邵县普遍推迟播种期5天～10天,收到了明显的效果。据抽
In recent years, spring and spring wheat varieties of planting area increased year by year, accounting for a large proportion of wheat production. Due to the greenhouse effect caused by the winter temperature was significantly increased, the development of wheat and wheat to speed up, heading generally generally earlier. From 1996 to 1997, the three-cropping barley in paddy field got full heading from March 10 to 15, which was more than half a month earlier than the normal heading stage. The three-cropping paddy field was also full heading from March 20 to 25, More than 10 days earlier than normal heading stage. Due to the low temperature, especially the strong cold wave attack, wheat and wheat ears after about half a month or so workers. Pollen grains and stigma activity were severely affected at this time, resulting in a severe decrease in fertilization rate and seed setting rate. In order to solve the problem of generally low seedling rate of wheat in recent years, winter sowing in 1997, Xinshao County, generally delayed sowing period of 5 days to 10 days, received a significant effect. According to pumping