论文部分内容阅读
冬油莱是延安南部地区的主要油料作物,近几年来种植面积迅速扩大,但冻害死苗是油菜生产上的一个严重问题。近几年我们试验推广宽窄行种植冬油菜的方法,对防止油菜冻害死苗有显著效果。根据油菜在我区发生冻害的时期和受冻害植株的表现,可分为冬冻和春冻两种。群众把冬冻叫“亢顶”,把春冻叫“冰闷”。冬冻比春冻危害严重。在秋冬雨雪多的年份,种植油菜时若以大量速效性化肥做种肥,容易形成旺苗。旺苗植株体内含水量高,汁液浓度小,冰点高,油菜体内易结冰,顶部幼嫩部分更易冻冰。由于雨雪多的年份土壤含水量大,结冰层致密坚实,土壤透气性能降低,造成冰闷环境,对油菜极为不利,使生理机能减退,甚至死亡。油菜的根颈越粗,体内含水量越高,根颈头越
Winter oil Lai is the southern part of Yan’an, the main oil crops, planting area has rapidly expanded in recent years, but frost damage dead seedling is a serious problem in rapeseed production. In recent years, we experimented with the promotion of wide and narrow row planting winter rapeseed method, to prevent rape cold frozen seedlings have a significant effect. According to rape in my area occurred during the freeze injury and the performance of the plants were frozen, can be divided into two kinds of winter and spring frozen. The masses called the winter cold called “hyperthyroidism”, the spring freeze called “ice stuffy.” Winter freeze harms more serious than spring freeze. Rain and snow in many years of autumn and winter, when planting rapeseed fertilizer to a large number of quick-acting fertilizer, easy to form Wang seedlings. Wang seedlings high body water content in the body, the juice concentration is small, high freezing point, easy to freeze the rape body, the top of the tender part of the more easily frozen ice. Due to the large amount of soil moisture in the snowy and snowy years, dense and firm icing layers, the lower permeability of the soil, resulting in an ice-borne environment, which is extremely detrimental to the rapeseed, which leads to diminished physiological functions and even death. Rape roots of the more coarse, the higher the water content in the body, the more the root neck