论文部分内容阅读
1 选择适宜土质与茬口西瓜制种适宜前茬为谷子、玉米、小麦、大豆。以选用轻壤上、砂壤上产籽量高,特别要防止重茬。2 严格隔离,防止混杂退化西瓜的自然异交率在50%以上,当品种间有树林、山岳、房屋等屏障物时,隔离距离不能少于300m,制种安全隔离距离应为1000m 以上。3 制种技术与管理3.1 父母本行比试验证明父母本行比采用1:20,既可满足制种田对花粉的需求,又最大限度地减少父本占地,实现最佳经济效益.3.2 密度与整枝方式
1 Select appropriate soil and stubble watermelon Seed suitable for the former crop of millet, corn, wheat, soybeans. The selection of light soil, sandy soils on the high yield, in particular, to prevent cropping. 2 strict isolation to prevent hybrid degeneration Watermelon natural outgrowth rate of more than 50%, when there is a variety of trees, mountains, houses and other barriers, the isolation distance of not less than 300m, seed security isolation distance should be more than 1000m. 3 Seed Production Technology and Management 3.1 Parents and Relatives This experiment proves that the ratio between parents and parents is 1:20, which can meet the demand for pollen farming and minimize the area occupied by the father to achieve the best economic benefits. 3.2 Density And pruning way