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1.在晋中特早熟棉区肥力中等偏高(全氮为0.12 0o)的土地上,以每亩6000-8000株,7月中旬摘心较为适宜。密度偏高应早摘心,密度较低可偏晚摘心。 2.叶面积在始花期以前,应有较快的增长速度,而始花期到盛花期间以增长较慢为宜。叶面积动态,初步认为盛花期叶面积系数为0.5-0.7,花铃期为1. 5-2 . 0,盛铃期·为2 .7-3 .7。娜3.营养生长与生殖生长的比值,盛花期以3.2-3.4,花令期以2.4-2.8,盛铃期以1.I-i.5较为适宜。一4.从1962年气候和棉株生育特点来看,可将8月IO日算作有效花期的终点。5.在晋中自然条件一「,棉株第1、2锥休一般成铃较高,发育较好,确保这部份棉铃的成长,并争取第3锥体多座棉铃乃是获得高产的基础’6.闪的脱落与产量天系不大。有效铃的脱落才是限制产量的决定因素。i.密植与旱熟的一致关系有一定的幅度。过高的密度(10000株/亩)井没有促进棉株发育,提早成熟的作用,反而导致晚熟,阶此箱前花的收早U
1. In Jinzhai precocious cotton area, with medium fertility (total N = 0.12 0o), it is more suitable for topping at 6000-8000 plants per acre and mid-July. High density should be early topping, lower density can be late topping. 2. Leaf area in the beginning of the flowering period, should have a faster growth rate, and the beginning of the flowering period to slow growth is appropriate. Leaf area dynamic, initially that the full-flowering leaf area coefficient of 0.5-0.7, flowering period of 1.5-2.0, Shengling period of 2. 7-3 .7. Na 3. The ratio of vegetative growth and reproductive growth, flowering to 3.2-3.4, anthesis to 2.4-2.8, Shengling 1.I-i.5 more appropriate. A 4. From the 1962 climate and cotton plant characteristics point of view, August 10 can be counted as the end of effective flowering. 5. In Jinzhong, a natural condition, "the first and second cones in cotton plants generally have higher bolls and better development to ensure the growth of this part of the bolls and obtain the third conch bolls with high yield Based ’6. The fall of flashes and the yield of a small natural system. Effective bell shedding is the limiting factor of yield .i. Close relationship between planting and drought have a certain range. Too high density (10000 / mu) Well did not promote the development of cotton plants, the role of early maturity, but lead to late maturity, order this box before the early harvest of flowers U