Corn straw granular fertilizer and preparation method thereof

The invention provides a corn straw granular fertilizer and belongs to the technical field of straw fertilizer preparation. The granular fertilizer comprises the following raw materials in parts by weight: 77-90 parts of corn straw, 20-36 parts of urea, 4-8 parts of powdered rock phosphate, 10-25 parts of potassium sulfate, 4-10 parts of monopotassium phosphate, 1-5 parts of limestone flour, 1-5 parts of magnesium chloride, 1-5 parts of sulfur powder, 1-4 parts of chelated trace elements, 0.3-0.8 part of an adhesive, 0.1-0.5 part of a slow-release agent and 10-20 parts of water. By adopting the corn straw granular fertilizer provided by the invention, the yield can be increased by 7.2-19.8%, and the quality of vegetables can be also improved. 本发明提供了种玉米秸秆颗粒肥，属于秸秆肥料制备技术领域。本发明所述颗粒肥包括以下重量份的原料：玉米秸秆77～90份、尿素20～36份、磷矿粉4～8份、硫酸钾10～25份、磷酸二氢钾4～10份、石灰石粉1～5份、氯化镁1～5份、硫磺粉1～5份、螯合态微量元素1～4份、粘合剂0.3～0.8份、缓释剂0.1～0.5份和水10～20份。利用本发明的玉米秸秆颗粒肥，可增产7.2～19.8％，还能提高蔬菜品质。