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在落叶松育苗生产中,常常出现幼苗早期封顶现象,影响苗木的产量和质量,降低经济效益。落叶松幼苗早期封顶是当幼苗长出2～4轮真叶时,顶端长出圆形芽苞,初呈绿色,后变褐色而停止生长。引起封顶的原因,根据我场多年观察实验主要有以下几点: 1.落叶松种子适宜在低温下催芽处理,由于低温处理的种子呼吸弱,养分消耗少,为发芽出土保存了充足的营养物质。与此相反,高温催芽处理的种子养分消耗多,育出的苗往往后期长势较弱,出现早期封顶。
In the larch seedling production, seedlings often appear early cap phenomenon, affecting seedling yield and quality, reduce economic benefits. Early larch seedling cap is when the seedlings grow 2 to 4 rounds of true leaves, the top grow round buds, the first green, brown and then stop growing. Causing the cause of capping, according to my field for many years to observe the experiment mainly the following points: 1. Larix seeds suitable for germination at low temperatures, due to low temperature treatment of the breath of the weaker, less nutrient consumption, for the preservation of the germination of adequate nutrients . In contrast, high-temperature germination treatment of seed nutrient consumption, nurtured seedlings tend to be late growth is weak, early cap.