Preparation method of special controlled-release organic fertilizer for eucalyptus

Abstract

The invention discloses a preparation method of a controlled release organic fertilizer special for eucalyptus, which comprises the following steps: uniformly mixing decomposed farmyard manure, compound fertilizer, clay, borax and zinc sulfate according to the nutritional requirements of the eucalyptus in different growth stages to obtain a base fertilizer; the preparation method comprises the following steps: mixing urea, monoammonium phosphate, calcium superphosphate, potassium chloride, clay, manganese sulfate, diammonium phosphate, potassium sulfate, magnesium potassium sulfate, borax, zinc sulfate and other raw materials according to different proportions, granulating, and respectively spraying with a polyurethane coating liquid and an epoxy resin coating liquid, polyurethane coating layers and epoxy resin coating layers with different thicknesses are sprayed on the through holes to obtain slow release fertilizers with different slow release periods, the slow release fertilizers with different slow release periods are mixed in proportion and then applied to planting holes at one time when eucalyptus is planted, and the slow release fertilizers are released in different growth periods of the eucalyptus; the proportion of various nutrient substances is regulated and controlled to meet the nutritional requirements of the eucalyptus in different growth stages, so that the fertilization frequency is greatly reduced, and the problem that the fertilization cost is relatively high is solved.