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只要土壤中的氮磷钾含量丰富,就能获得棉花高产。在乌兹别克喷四次矮壮素的土壤农化调查结果表明,棉花必须施用钾肥。这种土壤的有效态钾的含量极低,其播种面积比喷三次矮壮素的大。这就要靠土壤的消耗适量,并提高该元素的含量。在这种土壤上,虽然施用氮肥和磷肥,但得到的棉花产量就是比较低。棉花、玉米、苜蓿长期栽培在不施钾肥或年施钾量低(50 kg/ha)时,导致植株有效态含量的降低。在这种条件下,破坏了棉花子房和棉铃形成时的碳水化合物代谢。因而形成的铃小,纤维和种子的品质差。试验(1980—1981年)在塔什干省扬基尤利地区“国际”集体农庄进行。供试品种
As long as the soil is rich in nitrogen, phosphorus and potassium, you can get high yields of cotton. The results of a soil agrochemical survey of the four chlormequans in Uzbekistan show that cotton must be potash fertilized. This soil has an extremely low level of available potassium and its sowing area is larger than that of three CCC. This depends on the amount of soil consumed, and increase the content of the element. In this soil, although the application of nitrogen and phosphate fertilizer, but the resulting cotton yield is relatively low. Long-term cultivation of cotton, maize and alfalfa resulted in a decrease of plant effective content when no potassium was applied or annual potassium application was low (50 kg / ha). Under these conditions, the metabolism of carbohydrates in cotton ovaries and bolls was destroyed. The resulting bell is small and the quality of the fiber and seeds is poor. The experiment (1980-1981) was conducted at an “international” collective farm in the Yanikyu area of Tashkent province. Test varieties