Study Of Regulating Effect Of The Key Cultivation Technique Of High-yield On Hybrid Cotton

Hybrid cotton with individual characteristics of growth advantage obviously, strong resistance, potential to increase production.There fore, which makes full use of cotton heterosis, proven hybrid cotton high yield and key technology of controlling effect, building cotton high-yield cultivation techniques in Xinjiang, which for further developing cotton high-yield potential, promoting the sustainable production of cotton production in Xinjiang has important theoretical significance and application prospects. Zhaofengl and Lumianyan30were taken as the material in kashgar region of Yuepuhu county by the field experiment of three consecutive years to study the planting density of hybrid cotton canopy structure and the effect of photosynthetic production, and discuss spraying the mepiquant chloride on physiological regulation effect of hybrid cotton yield formation, which has been clear the nitrogen the ratios of base and topdressing nitrogen fertilizer of the effects of biomass, nitrogen absorption and yield of hybrid cotton, providing a theoretical basis of cotton high-yield cultivation. The main results were as follows:1. To investigate the change of hybrid cotton canopy structure, photosynthetic characteristics and yield forming under different densities level. The result showed that the maximum leaf area index (LAI) trend to decrease with reproductive process, which was the maximum at the flowering stage and11.25x104plants/hm2significantly smaller than18.75×1O4plants/hm2,26.25×104plants/hm2. Canopy structure first trend to decrease and then increase, which was minimum at the boll stage. The law of light transmittance at the boll stage was11.25×104<18.75×104<26.25×104(plants/hm2). The transpiration rate of opposite leaf boll showed first decreased and increased, but the SPAD and Pn showed first increased and then decreased, and both law were18.75×104>11.25×104>26.25×104(plants/hm2). From yield components, with density increasing the number of bolls per plant decreased. The total boll number showed the law of18.75×104>26.25×104>11.25×104(plants/hm2), lint was no difference. Yield was9800kg/hm2under the condition of the18.75×104plants/hm2. Hybrid cotton was not only express individual, but also had the group advantage with the18.75×104plants/hm2density treatment in the southern of Xinjiang. There was no difference on variety. 2. To clear the spray mepiquat chloride of physiological regulation effect on cotton yield formation. Spaying mepiquat chloride has not changed the regular of the main physiological indicators on hybrid cotton, but which had improved the peak and duration. Using mepiquat chloride3-4frequencies was conducive to compact of plant to hybrid cotton, which the number of fruit branch was9-10, a higher number of bolls, the total bolls was approximately175x104pers·hm-2, the boll weight was over5.5g."Three bolls" was priority to before summer bolls and summer bolls, and the supplementary of autumn bolls, bolls mainly distributed close to stem in horizontal, constitute the bolls and surround the boll in the highest proportion was the close to stem, bolls mainly vertical distribution was the middle and the upper bolls.There was a higher and slower decline in SPAD value, a higher photosynthetic(Pn) rate with longer duration; the increasing obvious of soluble sugar content (SS) and soluble protein content (SP) of the function leaves; a significant increase in lint yield. There was no difference of variety.3. To clear the ratios of base and topdressing nitrogen fertilizer the influence of biomass, nitrogen absorption and yield Hybrid cotton dry matter weights and nitrogen accumulations in different treatments accumulation were first increasing after then descending under the equal amounts of nitrogen. Further analysis that0:10treatment had hindered seriously the accumulation of photosynthesis product and the accumulation rate of plant and advanced of the period and accelerated the senescence process;2:8treatment had increased quickly of the dry matter accumulation and the rapid accumulation of the duration and increased the biomass and the amounts of nitrogen accumulation at after the appearing flower stage and increased the photosynthetic product accumulation of transferring to the reproductive organs; because of the lower fertilizer proportion of the4:6treatment had reduced the amounts of the dry matter and nitrogen accumulation of after the flowering stage and lessened the allocation proportion of the dry matter and nutrient to the reproductive organs during the blooming stage. The parameters of the dry matter and the amounts of nitrogen accumulation were the most coordination and balanced the biomass accumulation and the nutrient adsoiption under the base fertilizer to topdressing fertilizer was2:8in this experimental condition, and via adding the boll and boll weight to realize high-yield. There was no difference between different varieties in the same treatment.