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(一)党的十一届三中全会以后,党的方针政策调动了广大棉农的植棉积极性,推广了科学种棉技术,特别是灌溉抗旱技术,使棉花增产效果较为显著。棉花通过强大的根系,从土壤中不断地吸收水分,同时又通过叶面蒸腾向空间散失大量的水分,因此,棉株的生命活动需要大量水分不停地流动运转,但实际上保留在棉株内的水分和被棉株合成而利用的水分是极少数,通常被同化形成干物质的水分只有0.02—0.03%。棉花从开花到成铃是营养生长转入生殖生长最旺盛时期,也是棉花需水最敏感的时期,棉株根深叶茂,蕾铃并增,对水分的需要量最大。这个时期正是七、八月伏旱,时间长,温度高,如果水分状况失调,将使磷素进入棉株的数量和叶片内有机态磷化合物的形成减少,会在某种程度上影响棉株的生育。过于干旱,容易造成蕾铃脱
(1) After the Third Plenary Session of the 11th CPC Central Committee, the party’s principles and policies have mobilized cotton farmers’ enthusiasm for cotton-planting and promoted scientific cotton-growing technologies, especially irrigation and drought-resistance technologies, which have made the cotton yield more remarkable. Cotton through a strong root system, constantly absorbing water from the soil, but also through the foliage to evaporate a lot of space to the water, therefore, cotton plant life activities require a lot of water constantly running, but in fact remain in the cotton plant Moisture and the moisture that is used by the cotton plant synthesis are very few, usually only 0.02-0.03% of the moisture assimilated to dry matter. Cotton flowering from into the bell is the vegetative growth into the most productive period of reproductive growth, but also the most sensitive period of cotton water, cotton plants deep leaves, buds and increased, the greatest demand for water. This is the period of July and August, when the drought is over for a long time and the temperature is high. If the water condition is out of balance, the amount of phosphorus entering the cotton plant and the formation of organic phosphorus compounds in the leaves will be reduced, which will affect the cotton plant to some extent Birth. Too dry, easily lead to off the bud