Slow-release water-retaining fertilizer and preparation method thereof

Abstract

The invention relates to a slow-release water-retaining fertilizer and a preparation method thereof. The slow-release water-retaining fertilizer is prepared from following components in parts by weight: 100 parts of a compound fertilizer, 10-20 parts of a water-retaining slow-release agent, 2-5 parts of an adhesive and 0.01-0.5 part of a plant growth regulator; wherein the water-retaining slow-release agent is modified montmorillonite nano powder; the preparation method of the modified montmorillonite nano powder comprises the following steps: step 1, activating montmorillonite to obtain activated montmorillonite nano powder; step 2, preparing a barbituric acid reactant; step 3, preparing an acrylic acid cross-linked barbituric acid reactant; and step 4, preparing the modified montmorillonite nano powder. The slow-release water-retaining fertilizer prepared by the invention not only has strong water absorption performance and strong water-retaining performance, but also has the effects of adsorbing heavy metals and purifying soil, greatly improves the nutrient utilization rate of the fertilizer and the utilization rate of water resources, reduces agricultural heavy metal pollution, and meets the requirements of national sustainable development strategies.

Description

technical field

[0001] The invention relates to the field of slow-release water-retaining fertilizers, in particular to a slow-release water-retaining fertilizer and a preparation method thereof. Background technique

[0002] China is a large agricultural country, and the development of agriculture is inseparable from water and fertilizers. China is the world's largest producer and consumer of chemical fertilizers, and at the same time, it is a country that is very short of water resources. According to statistics, my country's per capita water resource occupancy rate is only a quarter of the world's average. At the same time, my country's fertilizer use has shown a substantial growth pattern, but the increase rate of grain production has not reached the same level. There are many reasons for this phenomenon, and the decrease of fertilizer and water utilization rate is an important reason for the decrease of yield increase effect. It is particularly important to improve wat...

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