Special slow/controlled-release fertilizer for ratoon rice and preparation method thereof

Abstract

The invention belongs to the field of fertilizers, and particularly relates to a special slow / controlled-release fertilizer for ratoon rice and a preparation method thereof; the special slow / controlled-release fertilizer comprises an inner layer, a slow-release layer, a middle layer and a coating layer; the inner layer is prepared from urea powder, calcium superphosphate, potassium chloride and agranulation binder; the slow-release layer is prepared from hydroxymethyl cellulose and bentonite; the middle layer is prepared from urea powder, calcium superphosphate, potassium chloride and a granulation binder; the coating layer is prepared from polyurethane and paraffin; according to the invention, the characteristics of nutrients required by ratoon rice first-season rice in different periodsare utilized, nitrogen, phosphorus and potassium nutrients are accurately proportioned, applied in one time, and released in a staged manner, on the basis of meeting the nutrient requirements of theratoon rice first-season rice, the application frequency of the fertilizer in the whole growth period of the first season of the ratoon rice is reduced to only one time of fertilizer application before rice transplanting from five times at present, ratoon rice simplified fertilization is achieved, the labor cost input in the fertilization link is obviously reduced, meanwhile, the tiller number andyield of the ratoon rice can be remarkably increased, and cost saving and efficiency increasing are achieved.

Description

technical field [0001] The invention belongs to the field of fertilizers, and in particular relates to a special slow-controlled release fertilizer for ratooning rice and a preparation method thereof. [0002] technical background [0003] Raisoning rice is a resource-saving rice farming model that adopts certain cultivation and management measures to make the dormant buds on the rice piles of the first season of rice germinate and grow into ears and then harvest for one season. Insufficient and "double-to-single" rice areas are an important rice farming system to increase rice planting area, stabilize total rice production, adjust grain structure, and improve grain production efficiency. Due to the different growth and development stages, the required nutrients are also different. The nutrient absorption of nitrogen, phosphorus, and potassium at the tillering-booting stage respectively accounts for about 10% of the total absorption. 50%, 60% and 55%, the nutrient uptake of ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of special slow and controlled release fertilizer for ratooning rice and its preparation method, in order to solve the problems such as high fertilization frequency, time-consuming and laborious, high fertilization cost existing in traditional fertilizer and fertilization method, the present invention is based on the first season of ratooned rice The law of demand for fertilizers in each growth period, providing a slow-control fertilizer that can be applied at one time, can meet the nutrient requirements of the first, middle and late seasons of ratooning rice

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