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从当前棉花产量水平来看,亩产籽棉600斤,则生物学总产量可达1500斤左右,其光能利用率只有1.5%左右。如果将其光能利用率提高一步,则棉花增产潜力是相当大的。为了提高棉花对光能的利用,于1978年在江西共大总校农学系红壤棉花高产试验田中,进行了“前促”不徒长和“中缓”防脱落两方面生理的研究,以探索棉花高产、稳产的有效途径。“前促”,先在棉籽播种前用微量元素(如硫酸铜和硼酸)浸种和进行干湿锻炼,促使棉花出苗早、全、齐、快、壮;后在苗期和初蕾期采用尿素、蔗糖和“九二○”等进行根外追肥,节节促进,以壮大营养体,加快真叶生长,缩短子叶期,扩大叶面积和延长其叶片光合时间,增加干物质的积累。
From the current level of cotton production point of view, 600 kg of seed cotton per mu, the total biological output of up to 1,500 pounds, the light energy utilization rate of only 1.5%. If you increase the utilization rate of its light energy, cotton yield potential is considerable. In order to improve the utilization of light energy of cotton, in 1978, Jiangxi Agricultural University, Department of Agronomy red soil cotton yield test field, conducted a “before promoting” unscrupulous and “moderate” anti-drop two aspects of physiological studies to explore the cotton High yield, stable production of effective ways. Before the cottonseed is sowed, the seedlings are soaked with trace elements (such as copper sulfate and boric acid) and wet and dry before cottonseed, which promotes early, full, uniform, rapid and strong cotton emergence. At the seedling and early budding stages, urea , Sucrose and “920” for root top dressing, promote steadily, in order to strengthen nutrition body, accelerate true leaf growth, shorten the period of cotyledon, expand leaf area and prolong the photosynthetic time of leaves, and increase the accumulation of dry matter.