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红优2号西瓜往年表现不错,但1990年收成不佳,全县瓜田座瓜率为50％的较为普遍,座瓜率为30％左右的仍为数不少。其原因有气候因素,也有栽培技术问题。一、气候因素阳高北部西瓜的农事物候是,5月播种出苗,6月抽蔓孕蕾,7月开花座瓜,8月瓜熟蒂落。1990年西瓜出苗期的5月下旬和放条期的6月上旬,平均气温比历年值低了2.62℃,为18.9～16.28℃;抽蔓孕蕾期的6月份平均气温比历年值低1.4℃,为20.4～19.0℃。苗期和蔓期的低温冷凉,使得西
Hongyou No. 2 watermelon performed well in previous years, but poor harvest in 1990, the county melon rate of 50% is more common, seat melon rate of about 30% is still a large number. The reasons for climate factors, but also cultivation techniques. First, the climatic factor Yang agricultural north watermelon phenology is May, sowing seedlings in May, pumping sucking buds in July blossom seat melon, August ripened. In 1990, the average temperature in early May and the early June in the emergence period of watermelon was 2.62 ℃ and 18.9-16.28 ℃ respectively lower than the historical value. The average temperature in June of pumping and breeding buds was 1.4 ℃ lower than the historical value , 20.4 ~ 19.0 ℃. Seedling and Manchu cold, making the West