Multifunctional sustained-release fertilizer

Abstract

The invention relates to a multifunctional sustained-release fertilizer. The multifunctional sustained-release fertilizer is prepared by the following methods that screened urea and potassium sulfate are placed in a stirrer for fully stirring by the weight ratio, after the urea and the potassium sulfate are uniformly mixed, a fertilizer pelletizer is utilized to conduct pelleting, and polyurethane resin is utilized to coat particles after pelleting; screened ammonium dibasic phosphate, magnesium sulfate, zinc sulfate, sodium octaborate, ammonium molybdata, alpha- Naphthyl acetic acid , alginic acid, vitamin C, polyacrylamide, humic acid and BSAD are placed in the stirrer for fully stirring by the weight ratio, and after the components are uniformly mixed, the fertilizer pelletizer is utilized to conduct pelleting; particles coated by the polyurethane resin and particles which are not coated by the polyurethane resin are fully uniformly mixed to obtain the multifunctional sustained-release fertilizer. The multifunctional sustained-release fertilizer can provide multiple required elements for growth of crops; a coating technology is adopted, so that the sustained-release effect can be achieved, and the utilization rate of the fertilizer is high; the crops can be stimulated to take root, soil can be improved, moisture and fertility can be preserved, rich water seepage force can be improved, continuous cropping can be resisted, soil-borne diseases are reduced, labor and time are saved, and yield and quality of the crops are improved.

Description

technical field

[0001] The invention relates to a multifunctional slow and controlled release fertilizer. Background technique

[0002] In recent years, the amount of chemical fertilizers used in my country has been increasing significantly, but the total grain output has not increased significantly in the past 10 years. Comparing the period from 1977 to 2005, the use of chemical fertilizers in my country increased by 700%, while grain production increased by 71%, while the planting area decreased by 13%. Obviously, the amount of chemical fertilizers has increased greatly, but crop yields have not increased accordingly, nutrient benefits have continued to decline, resource and environmental problems have become more and more prominent, and environmental pollution is very serious. This is mainly due to improper fertilization for a long time, which makes the soil have a single nutrient concentration that is too high, and harmful substances are easily produced in the soil and ...