Water-retaining and slowly-release compound fertilizer and preparation method thereof

Abstract

The invention discloses a water-retaining and slowly-release compound fertilizer and a preparation method thereof. The water-retaining and slowly-release compound fertilizer is prepared from the following components in parts by weight: 60-75 parts of chemical fertilizers, 1-6 parts of a water-retaining agent and 19-39 parts of filler, wherein the chemical fertilizers are at least two of a nitrogen source fertilizer, a phosphorus source fertilizer and a potassium source fertilizer; the water-retaining agent is at least one of polyacrylamide, sodium polyacrylate and sodium carboxymethylcellulose; the filler is at least one of bentonite, attapulgite, kaolin, talcum powder and gypsum powder. The preparation method comprises the following steps: 1) mixing the chemical fertilizers, the water-retaining agent and the filler to obtain a mixture; 2) adding water in the mixture and granulating; stopping adding water when small particles are formed, then adding the filler powder, granulating, and finally drying to obtain the water-retaining and slowly-release compound fertilizer. The water-retaining and slowly-release compound fertilizer disclosed by the invention has a water-retaining property and a slowly-release property, and is capable of reinforcing the water-retaining and water-holding capacities of soil, increasing the utilization rate of water resources, increasing utilization rate of the fertilizers, reducing nutrient loss, resisting drought, and reducing the pollution of fertilization to an ecological environment; the preparation method is simple and easy to process and produce.

Description

technical field [0001] The invention belongs to the field of agricultural fertilizers, and relates to a compound fertilizer and a preparation method thereof, in particular to a water-retaining slow-release compound fertilizer and a preparation method thereof. Background technique [0002] Compound fertilizers are basic fertilizers based on simple fertilizers and (or) compound fertilizers, and are chemically or physically formulated into binary or ternary compound fertilizers with different nitrogen, phosphorus, and potassium nutrient compositions. Due to the joint application of nitrogen, phosphorus, potassium and other nutrients, the compound fertilizer can produce the effect of joint application and effectively improve the fertilizer effect. The compound fertilizer can be formulated into a variety of compound fertilizers containing various nutrients, economical and reasonable nutrient distribution ratio, and strong pertinence according to the needs of crops and soil condit...

AI Technical Summary

Problems solved by technology

However, during the application of compound fertilizers, there are still problems such as fast dissolution of fertilizers, easy leaching of nutrients, and low utilization rate of fertilizers.

Especially in the tropical to subtropical regions of my country, affected by the monsoon climate, the rainfall distribution is uneven, the dry and wet seasons are obvious, and the precipitation variability is large, which makes seasonal droughts often occur, and the lack of water leads to inefficient use of fertilizers after they are applied to the soil; In the rainy season, heavy rains are concentrated, nutrients are easily leached, and soil erosion is serious, so that most of the fertilizers applied to the soil are leached, resulting in waste of fertilizers and polluting the environment.

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