The Effect Of Phosphate Fertilizer Operations On The Cotton Growth Phosphorus Uptake And Yield

We researched the effect of cotton growth and yield by field plot experiment method. The results showed that: phosphorus showed consistent accumulation activity of cotton dry matter. They showed a process of from slow to fast then slow again. That was, the seedling stage was slow, bud stage accelerated and flowering to boll stage attained to the peak of dry matter accumulation. They stabilized gradually after this, which consistent with "S" curve of crop growth. We analyzed dry matter accumulative regularity by logistic model and elucidated the biological significance of model patameters. Appropriate levels and ways of phosphate application can promote the total dry matter of cotton early growing stage accumulated, of amount growth and dry matter from vegetative growth to the transfer of cotton seed, dry matter transferred from vegetative body to fiber so that getting higher yield.Phosphorus absorption of each treatment and accumulation of dry matter of cotton were the same .The bud come out slow in every growth stage. In all the vegetate stages, accelerated gradually in Bub phase, attained to the peak from flower to bolling stage, then it gradually become steady, which meet the growing plants"S"curve. Logistic equation was used on the cotton phosphorus assimilation and accumulation, elicited that the maximum intensity of cotton absorbing phosphorus occurred at flowering stage to boll stage in a different amount and and applied styles of phosphorus of this period, so wet should focus on phosphorus application this time. The maximum phosphorus accumulation rates of the cotton emergence time t0 advanced as the content of phosphorus fertilizer increased under the extent of 0～150kg/hm~2 in all the different phosphate levels experiments. Phosphorus fertilizer drip application can promote the cotton phosphorus absorption in the early stage of cotton plant vegetate in all the different phosphate applied styles. but a lot of fertilizer drops was not conducive to cotton growth and P absorption later on in the whole growth period. Treatment P3(50% base application + 50% drip application) handled the largest accumulation of phosphorus which was higher than others. cotton on the phosphorus uptake rate showed a single peak curve, the absorption rate of cotton on the phosphorus was all greater than the P0 treatment. Cotton gave priority to vegetative growth 30d after emergence and the P absorption rate was low. The uptake rate began to increase gradually 77d after the seedlings come out. The maximum rate of absorption of phosphorus of all the treatments was emerged in flower and boll stage, namely 106d after the seedlings come out.Phosphorus had little effect on cotton lint percentage. the amount of different phosphorus can significantly influence boll number, boll weight and lint yield. Treatment P2 had the largest cotton yield, attaching to 1721.88 kg/hm~2. The different phosphorus applied methods can increase the cotton boll weight significantly. Treatment P3 had the highest yield in all the treatments, which was 1799.44kg/hm~2, 77.56kg/hm~2 excessived than treatment P1.Reasonable phosphorus fertilizer was beneficial to cotton phosphorus element uptake and enhance the phosphorus fertilizer apparent efficiency. The nutrient uptake content increased as phosphorus content increased in the phosphorus amount of 0～150kg/hm~2 among all the phosphorus experiment, treatment P2 handled a maximum phosphate apparent utilization, which was 21.30%. treatment P3 deal (50% base application + 50% drip application) can effectively promote the phosphorus nutrients absorption of the cotton, the phosphorus fertilizer apparent utilization ratio up to 23.88%, which was 12.13% higher than the base application.