Study On Slow Release Effect And Mechanism Of Palygorskite Coated Fertilizer

A pot experiments was adopted to study the slow release effect and mechanism of palygorskite coated fertilizer on Spring wheat. The results showed are as follows:(1)Palygorskite coated phosphorus had advantage of making the fertilize release slowly, 1000-grain weight, economic coefficients, economic yield and biomass of spring wheat increased at different degree. Compared with the treatment of non-coated phosphorus, the grain number per spike, 1000-grain weight and economic coefficients of spring wheat under the treatment of palygorskite coated phosphorus all increased by 3.3%, 0.8% and 5.1 % respectively. Palygorskite coated urea can effectively improve the yield of spring wheat. Three kinds of Palygorskite coated urea with different coating thickness compared with CK, the economic yield, biomass of spring wheat, economic coefficient, 1000-grain weight and grain number per spike all increased obviously, and increase range are 18.21%～25.32%, 19.6%～23.47%, 0.58%～3.89%, 7.08%～8.68% and 6.82%～10.45% respectively, and It's showed larger production potential than non-coated urea.(2)To see with the different quantity of fertilizer, the 1000-grain weight, economic yield, biomass and economic coefficients increase gradually with the incresse of fertilizer quantity. Palygorskite coated phosphorus have the highest economic coefficient and economic yield at 2.59g/pot, which reached 49.2% and 36.9g/pot. Palygorskite coated phosphorus got the highest 1000-grain weight and biomass at 3.46g/pot, which reached 46.3g/pot and 75.8g/pot. Palygorskite coated urea has the highest economic yield and biomass by 20% thickness coat, and the economic yield is highest at 2.59g/pot, which reached 36.75 g/pot.(3) The variety trend of chlorophyll, MDA, soluble sugar content and soluble protein and the bio-chemical reaction of physiology inside the plant body and mutual influence, and it is good for yield formation and delay the aging process of spring wheat under the palygorskite coated fertilizer treatment.So it can be known that palygorskite coated phosphorus and Palygorskite coated urea both has the ability to slowly release and control fertilizer, prolong the growth period of spring wheat, postpone aging process, increase yield and raise fertilizer utilization. So it suggests that Palygorskite can be used as a new type of slow-release fertilizer coating materials applied in production.