Special controlled-release fertilizer for lotus roots and preparation method thereof

Abstract

The invention discloses a special controlled-release fertilizer for lotus roots and a preparation method thereof. The preparation method comprises the following steps of preparing a fertilizer core by urea, potassium chloride, calcium phosphate, a trace element fertilizer, an inhibitor and a dispersant; performing inner coating treatment on the fertilizer core by an inner coating film agent which is prepared from polylactic acid, polyethylene glycol and ethyl alcohol; performing outer coating treatment on the fertilizer core by an outer coating film agent which is prepared from polyacrylate, ethylene propylene diene monomer, modified starch, acetone and water, so as to obtain the special controlled-release fertilizer for the lotus roots. Compared with the prior art, the special controlled-release fertilizer has the advantages that the nutrient elements in the fertilizer are rich, the utilization rate of a nitrogen fertilizer is high, the controlled-release property is good, and the nutrient requirement of the lotus root in each growth period is met; the outer coating can be recycled, so that the environment-friendly effect is realized; the inner coating can be completely degraded, so that the danger to surrounding environment is avoided.

Description

technical field [0001] The invention relates to the field of controlled-release fertilizers, in particular to a special controlled-release fertilizer for lotus roots and a preparation method thereof. Background technique [0002] The nutrients needed by the lotus root during its growth and development come from the photosynthesis of the lotus leaves on the one hand; Although the feces and residual bait of the fish can provide a certain amount of nutrients for the lotus root, it is very little compared with the growth demand of the lotus root, so it must be topdressed in time. The growth period of lotus root is long, and it is generally topdressed 2-3 times. Let off the field water before each fertilization, so that the fertilizer can be absorbed into the water, and then irrigate to the original depth. In deep-water lotus root fields, fertilizers are easy to lose, and liquid fertilizers cannot be applied directly. The method of solid fertilizer application should be adopted...

AI Technical Summary

Problems solved by technology

At present, the controlled-release fertilizers commonly used in the market are mostly developed for terrestrial plants. Since aquatic plants such as lotus roots grow in water, the use of controlled-release fertilizers is not only affected by water, light, temperature, but also by ions and microorganisms in the water. The degree of complexity larger than land plants