论文部分内容阅读
就杂交棉A-92生长发育特点、干物质生产与分配,产量形成规律及配套栽培技术等方面进行探讨。结果表明:杂交棉A-92干物质生产与积累、籽皮棉产量、单株成铃数、铃重、总果节数、节枝比、铃枝比、叶面积系数、根系活力等均高于对照种鄂荆1号,具有明显地竞争优势。杂种优势主要来源于单株叶面积扩大,特别是果枝叶叶面积增长速度较快;产量优势主要表现为早发明显、伏前桃增多和单铃重增加。结合多年示范、试验结果,栽培技术上在适当稀植、发挥单株生产潜力的条件下(密度一般为33000~35000株/hm2),着重抓好促早栽培并抓好苗期至初花期化调技术,防止前期封行过早和旺长;施肥技术上,苗蕾期酌情减少氮肥用量,增加花铃期氮肥用量,且氮磷钾配合施用,延长中后期叶片功能期,提高单株成铃率,增加单株铃数和铃重,发挥其群体增产优势。
The hybrid cotton A-92 growth and development characteristics, dry matter production and distribution, yield formation and supporting cultivation techniques and other aspects are discussed. The results showed that dry matter production and accumulation of hybrid cotton A-92, seed cotton yield, number of bolls per plant, boll weight, total number of nodes, ratio of shoots to branches, boll / shoot ratio, leaf area index and root vigor were all higher Equestrian Hubei Jing 1, with a clear competitive advantage. The main advantage of heterosis was the expansion of leaf area per plant, especially the rapid increase of fruit leaf area. The yield superiority was mainly manifested as early onset, increased peachiness and boll weight. Combined with years of demonstration, experimental results, cultivation techniques in the appropriate sparse planting, to exert the potential of individual production conditions (density is generally 33000 ~ 35000 plants / hm2), focus on early cultivation and grasp the seedling to early flowering Adjust the technology to prevent premature closure of the premature and Mongolian; fertilization technology, Miao Lei period, as appropriate, reduce the amount of nitrogen fertilizer, nitrogen and phosphorus to increase the amount of flower and nitrogen and phosphorus with the application to extend the functional period of leaves in the late to improve individual plant into The boll rate increased the number of bolls per plant and boll weight, giving play to the advantage of increasing their yield.