海岛棉与陆地棉干物质积累与氮素吸收分配的特点

Dry matter and nitrogen accumulation distribution on Island cotton and upland cotton

以新陆中75号、新陆中54号、新海35号和新海48号为材料,研究陆地棉与海岛棉在相同管理条件下干物质积累与氮素吸收分配的特点。结果表明:陆地棉干物质积累总量在全生育期内均高于海岛棉,生殖器官干物质所占比例在生育前期小于海岛棉,后期逐渐大于海岛棉;氮素积累总量在全生育期内陆地棉均大于海岛棉,生殖器官氮素积累比例在生育前期为陆地棉小于海岛棉,后期逐渐大于海岛棉。与陆地棉相比海岛棉营养器官干物质以及氮素积累比例较大,不利于生育后期生殖器官干物质的积累与分配,从而影响棉花产量。因此,在大田管理中应注意在生育后期加强对海岛棉的水肥管理。

The Xinluzhong No. 75, Xinluzhong No. 54, Xinhai No. 35 and Xinhai No. 48 were used as material in study on upland cotton and island cotton under the same management conditions to investigate the dry matter accumula-tion, nitrogen absorption and distribution characteristics. The results showed that the upland cotton dry matter accumula-tion amount in the whole growth period was higher than that of sea island cotton, reproductive organ dry matter percentage in the early growth period was less than that of sea island cotton, later became larger than that of the sea island cotton; nitrogen accumulation amount in the whole growth period of upland cotton were greater than that of sea island cotton, re-productive organ dry matter and nitrogen accumulation ratios in early growth stage for upland cotton is smaller than that of sea island cotton, later becoming larger than sea island cotton. Compared with vegetative organs of upland cotton, dry matter and nitrogen accumulation of the sea island cotton which is not conducive to the growth stage of reproductive organ dry matter accumulation and distribution, thus affecting the yield of cotton. Therefore, in the field management, attention need to be paid on the management of water and fertilizers of island cotton during the late growth stage.