论文部分内容阅读
棉花采用密植化学除草不中耕是当前棉花栽培另一种方法。它比早播、稀植、中耕多次的播种期晚30—40天,但提早拔秆15天左右,前后作物可以不套种。为了发挥群体增产作用,每亩密度为15000—20000株。早打顶,每株留3—4个果枝,主攻伏挑。前期用除草剂灭草,中、后期以密植控草,整个生育期不中耕。经我省连续5年多点试验和大面积示范证实,它可以克服我省3—4月播种时,低温多雨,烂种死苗和深秋低温多雨烂桃或不吐絮等不良气候的影响,能一播全苗,提高棉花品质;能避开前期棉蚜、地老虎和后期第四代棉铃虫的为害;还能调节棉花与小麦、油菜等春收作物及插早稻争季节、争劳力、争土地的矛盾,从而提高了土地利用率,争取粮棉、油棉双丰收。在同一品种,土、肥、水相当的条件下,棉花采用密植与化学除草不中耕相结合,除草效果达75—95%,其产量,一般比当地早播、稀植、多次中耕的增产两成左右。高的每亩产皮棉150—200斤。省工50%左右,降低成本20—30%。
Cotton with close planting chemical weeding is not the current cultivation of cotton is another method. It is 30 to 40 days later than the sowing date, sparse planting and cultivating multiple times. However, the crop can be planted for 15 days before and after the stalk. In order to play a role of group production, the density per acre 15000-20000. Early topping, leaving 3-4 fruit branch per plant, the main volt pick. Pre-weeding herbicide, in the late planting to control the density, the entire growing period does not cultivate. By the province for more than five years of trial and large area demonstration confirmed that it can be overcome when the province sowing from March to April, low temperature rainy, dead and dead seedlings in late autumn, cold and rotten peach or no catfish and other adverse climate effects, can A broadcast seedlings, improve the quality of cotton; Aphids can be avoided in the early stage, the tiger and the fourth generation of the late generation of cotton bollworm damage; but also to regulate cotton and wheat, rapeseed and other spring crops and plug the season of early rice fight, fight for labor, fight Land conflicts, thereby increasing the utilization rate of land for grain and cotton, cotton double harvest. In the same species, soil, fertilizer, water under the conditions of the close planting of cotton and chemical weeding without tillage combined herbicidal effect of 75-95%, its output, generally higher than the local early sowing, thin planting, cultivating a number of times About two percent. High per acre lint 150-200 kg. Provincial labor about 50%, reduce costs by 20-30%.