| With SCRC 28 as material,Four treatments were conducted with N2K2, N2K1, N1K2 and N0K0,the difference of modality and physiology and biochemistry on cotton senescence he effects of nitrogen and potassium fertilizer on cotton senescence could be obtained by analysis of above results,to provide scientific reference for regulation of cotton premature senescence and high yield cultivation.The results as follows:1. The effect of function leaf chlorophyll content at different proportions of nitrogen and potassium fertilizer has a certain influence,N2K2 treatment was significantly higher than others in the later stage, while chlorophyll decreased rapidly N0K0. It can be concluded that lack of nitrogen and potassium nutrition of cotton growth accelerated chlorophyll degradation late.2. It was not significant that soluble protein and soluble sugar content of function leaf under different treatments;Soluble sugars in the fruit branches and boll in significantly different,N0K0 treatment fruit in the foliage of soluble sugar was significantly higher than other treatments,But the boll in the lower levels; Note lack of nitrogen and potassium in leaves is not conducive to fruit shipped nutrients for the growth of reproductive organs.3. The effect of SOD,POD,MDA, N0K0 treatment accelerated the accumulation of MDA content; SOD, POD activity showedNitrogen and potassium on the main stems and leaves of cotton SOD activity significantly affected the middle and late. Comparison of various treatments N2K2>N1K2>N2K1>N0K0, POD enzyme N2K2, N1K2 N2K1 treatment and no significant difference between, in the late N0K0 significantly lower than other treatments.4. Different nitrogen and potassium nutrition on the IAA, GA, ZR, ABA Hormones. IAA content was: N2K2>N1K2>N2K1>N0K0; GA content in all the treatments was not significant; N0K0 in ZR content was significantly lower than other treatments; and K on the ABA content of more significant, ABA content with the amount of K of increasing. 5. Different nitrogen and potassium nutrition on chlorophyll fluorescence in cotton feature on the main stem the impact of changes, Fv / Fm overall performance for the N2K1>N2K2>N1K2>N0K0; qP the overall performance of different treatments for the N2K1> N1K2> N2K2> N0K0; The results showed that high light intensity reduce the photochemical efficiency of PSâ…¡reaction center, the appropriate N and K nutrition can improve the efficiency of photosynthetic electron transport.6. Plant accumulation of nitrogen and potassium distribution, the whole growth process of the total cotton shoot dry matter accumulation can be fitted with a Logistic equation, each dealing with the rapid absorption of nutrition during the different absorption of the transition period and the significant difference between the absorption intensity. Nitrogen and potassium in different organs of nutritional treatment on the distribution of significant effects, N0K0 leaves and stems and branches high in nitrogen and potassium content, nutrient content can not be transferred timely to the reproductive organs.7. N and K nutrition affects different individuals and groups in situation of cotton, plant height, stem diameter and leaf area index showed no significant difference in pre-, mid-and late N2K2>N2K1,N1K2>N0K0.8. Root activity influenced by nitrogen and potassium, after flowering the overall performance of the N2K2>N2K1>N1K2>N0K0.In summary, nitrogen and potassium help to improve the main cotton leaf chlorophyll and soluble protein content, nitrogen and potassium deficiencies significantly accelerated the aging Cotton. The vegetative organs of plant nutrient transfer to the reproductive organs significantly affected by nitrogen and potassium, nitrogen and potassium deficiencies are not conducive to the transfer of nutrients to the leaves produce bolls, reducing quality and yield of cotton, cotton promote premature aging. Lack of nitrogen and potassium membrane lipid peroxidation strong peroxidation damage to the membranes increased, accelerated aging.
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