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棉苗营自养生活后,光合积累大于呼吸消耗。由于棉花苗期较长,叶面积小,又加前作荫蔽、病虫为害,机械损伤等而使叶面积更小,至使光合效能很低,抗逆性差。故头五片真叶对棉苗生育至为重要。但有关棉花1至5片真叶对棉苗生育影响的报道尚不多见,本试验旨在探讨1—5片真叶对棉苗生育的影响,以有助于农业生产。材料与方法本试验于1983年4—6月在本院试验地进行。试验地为粘土,肥力中等。选取肥力一致的地段,于4月25日播种,待出苗后,选取生长一致的棉苗挂牌标记,待真叶刚现时,
Cotton seedlings self-supporting life, photosynthetic accumulation is greater than the respiratory consumption. As the cotton seedling longer, leaf area is small, but also as a former shade, pest damage, mechanical damage, leaving the leaf area smaller, so that photosynthetic efficiency is low, poor resistance. So the first five true leaves of cotton seedling is very important. However, there are few reports on the effects of 1 to 5 true leaves of cotton on the growth of cotton seedlings. The purpose of this experiment is to investigate the effect of 1 to 5 true leaves on the growth of cotton seedlings in order to contribute to agricultural production. Materials and Methods This test was conducted in our hospital from April to June 1983. Test for the clay, medium fertility. Select the same fertile lot, sown on April 25, after emergence, select the same growth of cotton seedling tag, to be true leaf just now,