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冬油菜的死苗问题,是我区油菜生产上一个急待解决的严重问题。平常年份死苗都在20—30%左右,严重年份,造成大量翻种。今年全区20万亩油菜,大量死苗,给农业生产造成很大损失。死苗原因:一是冻害,二是病虫为害。但冻害是导致油菜大量死苗的主要原因。冻害,根据发生的时期,又分为冬冻和春冻两种。冬冻是油菜越冬期间发生的冻害,群众叫“亢顶”。植株表现为地上部叶片、叶柄全部枯干,油菜根头顶上部1.0—1.5毫米发生脱水、凋萎、皱缩、绵软、有粘性。春冻是在冬春多雪年
Dead rapeseed winter seedlings problem, is our rapeseed production a serious problem to be solved. Dead seedlings are 20-30% in normal years, a serious year, resulting in a large number of seed. This year 200,000 mu of whole area rape, a large number of dead seedlings, to agricultural production caused great losses. Dead seedlings reasons: First, frost damage, and second, pests and diseases. However, the frost damage is the main reason for the large number of dead rapeseed rape. Frost damage, according to the time of occurrence, is divided into two types of winter frozen and spring frozen. Winter frozen is the cold damage occurred during the winter rape, the crowd called “hyperthyroidism.” Plants showed aboveground leaves, all withered petiole, rape root top 1.0-1.5 mm dehydration, wilting, shrinkage, soft, sticky. Spring is frozen in winter and spring snowy years