Effect Of Long-term Fertilization On Rice Growth And Soil Fertility In Red Paddy Soil

This study is based on the long-term fertilization on red paddy soil in Jiangxi instituteof red soil, the impact of soil fertility, the rice growth and the change of soil fertility, whichwere caused by the long-term fertilization of N, P, K, NP, NK, NPK, NPK2, NPKM, CKand PK10treatments, were stdudied. In purpose to the reasonable fertilization andSustainable increassing of yield on Red paddy soil. The results are as follows:1. The influence of the long-term fertilization on rice growth and developmentThe rice leaf area index, sword leaf SPAD value, the photosynthetic rate of Nprocessing treatments is significantly higher than N deficiency treatments.Chemicalfertilizer coorprated with organic fertilizer improved the leaf area index of different growthstage, leaf SPAD values and the photosynthetic rate of sword leaf significantly.Application of N, P, K fertilizer could promote the absorption efficiency of each other,increase the rice yield. Nitrogen promote tillering, increase the effective panicles of ricesignificantly; Phosphorus can improve the effect of rice seed setting rate, increasing theThousand seed weight significantly; Potassium has important impact on the size of ricegrain; Single or partial chemical fertilizztion will lead to a fall in production; Balancedfertilization could increase production significantly, and optimizing the yield components;Deficiency of phosphorus affect the reproductive growth of rice significantly, the treatmentwhich is deficient of P is later from spike differentiation to mature period, the latest Ntreatment is8-9days later than the earliest P treatment. Chemical fertilizer cooprated withorganic fertilizer could increase rice yield and biological yield significantly and continous.The yield of NPK treatment is42%higher than CK treament, the yield of NPKM treatmentis96%higher than CK treament,29%higher than NPK treatment, the yield of singlechemical fertilizer treatment is flat or slightly lower than CK.2. The influence of long-term fertilization on soil physical、chemical properties andfertility.Long-term chemical fertilization or no fertilizer, soil bulk density increased, there isno significant difference between each other;Chemical fertilizer coorporated with organicfertilizer for a long time, reduce the soil bulk density significantly. Long-term no fertilizeror fertilizer, the content of NPK nutrient and soil organic carbon is flat or slightly lowerthan contrast, chemical fertilizer cooprated with organic fertilizer, soil organic carbon andcontent of NPK nutrient increase in different degree;N, P and K element promote theabsorption of each other obviously, application of partial fertilizers, cause serious depletionof the elements which wasn’t applied, the depletion of nutrients becomes to obstacle factorof the rice growth.Long-term partial application of fertilizer cause serious imbalance ofsoil nutrients, the soil fertility and productivity is even lower than long-term no fertilizertreament. Under this fertilization levels, regardless of the long-term fertilizer, organicfertilizer, or no fertilizer, the change of soil pH isn’t obvious.Longitudinal, the long time fertilization model-NPK chemical fertilizer corrpratedwith organic fertilizer, which can increase rice yield significantly, maitain at higherproduction levels, improve the soil physical and chemical properties,increase soil fertilitysignificantly, is the best fertilization model in red paddy soil.