Study on properties of coated slow release fertilizer prepared by modified polyacrylate
In order to prepare a slow release fertilizer that can be used for rice sowing and fertilization together in the experiment,methyl methacrylate(MMA)and butyl acrylate(BA)were used as the main materials,small amount of carboxymethylcellulose(CMC)and nano-SiO2 were added as modified materials to prepare modified polyacrylate emulsion to wrap the fertilizer to achieve the slow release effect.The 25 ℃ hydrostatic dissolution rate method was adopted,combined with infrared,electron microscopy and other analytical techniques,the nutrient release law of modified polyacrylate slow release fertilizer prepared with different raw material ratio and three coating amount(10％,15％,20％)in water was explored.The results showed that the sustained release effect was the best when the mass of CMC accounted for 5％of solid content(BA+MMA)and the coating amount was 20％,and the cumulative nutrient release rates on 1 and 28 days were 0.5％and 63.8％,which were lower than 15％and 80％,respectively.In addition,the potting experiment was carried out using this specification of self-made slow release fertilizer,the content of total nitrogen and total phosphorus in potted surface water and the growth status of rice were compared under different fertilization rates and fertilization methods.The results showed that when the slow release fertilizer application rate was 70％of the traditional fertilization amount,compared with the traditional fertilization method,the total nitrogen and total phosphorus losses were reduced by about 56.4％and 88.9％,respectively,and the rice production was effectively increased.
万方数据
维普
