Studies On Population Quality Characters And Cultivating Countermeasures For High Yied Of Sea Island Cotton

Adoption three quarters×three levels orthogonal design and using fuzzy mathematics evaluation.Study on Population Quality Characters and density ,nitrogenous fertilizer, tip pruning times on sea island cotton yield and fiber quality.for high yied of Sea Island Cotton.Expound cultivated of high yield and eximious fiber quality for Sea Island Cotton in Xin Jiang. The main results were as follows:1. It is faster-grown for high yield level colony. Dry substance of plant and procreant apparatus were accumulated faster. The maximal speed was presented to postemergence 87～91d and 89～95d , the amount of accumulation was arrived 11980～15721 kg/hm~2 and 6335～7149kg/hm~2, in proportion with plant weight rate of procreant apparatus is 45.47～52.87%.2. The amount of fruit branch, boll and weighe of procreant apparatus is 91.74～124.57branchs/m~2, 59.98～77.44 bolls/m~2, 0.0116～0.0135 kg/m~2.3. The regression model between cultation factors and yield was established. The cultation factors restricted degree of cultivation measure was confirmed. The result that highest yield y=0.2415×10~4kg/ hm~2 can be obtained is density at 0.3×10~6plants/hm~2 , dressing carbamide 0.585×10~3kg/hm~2, tip pruning July 23th.4. The measure of fiber quality factors and subject equations were established. Using fuzzy mathematics evaluation obtain the regression model between cultation factors and fiber quality. The fiber quality factors restricted degree of cultivation measure was confirmed. The result that highest fiber quality y=1.6117 can be obtained is density at 0.1632×10~6plants/hm~2 , dressing carbamide 0.126×10~4kg/hm~2, tip pruning July 25th.5. Density is present negative correlate between fiber length lot limite, strength, elongation, SCI and present positive correlate between micronaire. Dressing carbamide amount is present negative correlate between fiber strength, micronaire and present positive correlate between fiber length lot limite, elongation, SCI. Tip pruning times is present positive correlate between fiber length lot limite, strength, micronaire, elongation and SCI.6. Yield and fiber quality optimal combination can be obtained is is density at 0.21×10~6 plants/hm~2 , dressing carbamide 0.525×10~3kg/hm~2, tip pruning July 25th.