Study On The Effect Of Controlled Release Fertilizer On The Different Kinds Of Phosphorus Fertilizers Absorption Of Hybrid Rice

This research mainly focus on: the effect of CRF on the phosphorus absorption ofhybrid rice and soil-fixed P; the effect of different amount of CRF on thephosphorus absorption and yield of hybrid rice; the effect of CRF and differentkinds of phosphate fertilizers on the growth, phosphorus balance and yield ofhybrid rice by using ³²P tracer technique in hybrid rice (8820s/R29). The mainresults are showed as following:1.Experimental results of ³²P used to trace phosphate fertilizer showed that: thetrend of phosphorus absorption of hybrid rice in the whole growth stages is "S"curve. Compared with urea, CRF could significantly increase the absorption oftotal phosphorus, phosphate fertilizer and phosphorus in soil of hybrid rice inmaximum tillering stage, booting stage and ripening stage. The rate of release ofnitrogen nutrient from CRF is identical to the requirement of crop plants so CRFcould significantly improve the phosphate fertilizer utilization indexes of hybridrice and make the phosphorus transfer from stems and leafs to seeds. And finally,CRF increased the yield of hybrid rice. the application of CRF could enhance theefficiency of phosphorous fertilizer of crops that were in season, reclamationradio of phosphorous fertilizer and the recycled phosphorous fertilizer that wasfrom the residuum of phosphorous fertilizer while decreased the fixation ofphosphorous fertilizer in soil.2. Experiment was conducted to study the effect of different amount of CRF onthe phosphorus absorption and yield of hybrid rice. The result showed that, theapplication of CRF could improve the no. of tillers and spike, the chlorophyllcontent and dry matter weight during growth stages and the yield of hybrid rice.When the amount of nitrogen nutrient of CRF was decreased by 30ï¼…, the no. oftillers and spike, the chlorophyllâ…¡content, the dry matter weight and the yield ofhybrid rice could not be decreased compared by urea, respectively. Meanwhile,there were no apparent difference between CRF (70ï¼…N) and urea treatment for the absorption of phosphorus and the accumulation amount of phosphorus inseeds of hybrid rice. The effect of CRF (70ï¼…N) on the efficiency, availablepercentage, reclamation radio and soil fixation of phosphate fertilizer was sameas that of urea.3. Experiment was conducted to study the effect of CRF and different kinds ofphosphate fertilizers on the growth, balance of phosphorus and yield of hybridrice. The result showed that, within 3 phosphate fertilizers, AP had best improvethe dry matter weight, the yield, the efficiency, reclamation radio and availablepercentage of phosphate fertilizer and decrease the soil fixation. However CMPand SSP had better improve the phosphate fertilizer utilization indexes. 3 differentphosphate fertilizers had different effect on phosphorus efficiency of hybrid rice.SSP was good at improving phosphorus uptake efficiency, and AP at utilizationefficiency.