Special controlled release fertilizer for selenium-rich sweet potatoes and preparation method thereof

Abstract

The invention relates to a special controlled release fertilizer for selenium-rich sweet potatoes and a preparation method thereof. The special controlled release fertilizer for selenium-rich sweet potatoes comprises core fertilizers and a coating layer, wherein the core fertilizers include nitrogen fertilizers, phosphorus fertilizers, potassium fertilizers and selenium fertilizers; the total content of nitrogen phosphorus and potassium nutrients is 30-50%; the selenium fertilizers account for 0.4-0.9% of the total core fertilizers by weight; the weight ratio of N to P2O5 to K2O is (1-2.5) to (0.6-1) to (2-3.5); the coating layer comprises polycaprolactone and an additive starch. The invention also provides a preparation method of the special controlled release fertilizer for selenium-rich sweet potatoes. The fertilizer is applied to the bottoms of planting furrows once before sweet potato transplantation and top application is unnecessary. The application amount of the fertilizer per mu is 40-60kg. The special controlled release fertilizer for producing selenium-rich sweet potatoes has the effects that the nutrients of the fertilizer meet the requirements of the whole growing periods of the sweet potatoes and have controlled release effects; fixation of selenium by soil can be reduced and the effective period can be prolonged.

Description

technical field [0001] The invention relates to a special controlled-release fertilizer for selenium-enriched sweet potatoes and a preparation method thereof, belonging to the technical field of slow / controlled release fertilizers. Background technique [0002] Selenium is an essential nutrient element for human beings, and has various functions such as anti-aging and anti-oxidation. 72% of my country's regions are in selenium-deficient and low-selenium belts, and selenium deficiency in the environment will lead to various diseases in humans and animals. Due to the toxicity of inorganic selenate, selenium is often applied to the soil or sprayed on the leaves of crops to convert inorganic selenium into organic selenium, which enters the food chain through food crops and vegetables for human or animal utilization. [0003] Sweet potato is the fourth largest crop after rice, wheat and corn in my country. Sweet potatoes have a long growth period, high yield, and require a larg...

AI Technical Summary

Problems solved by technology

This fertilizer is mainly suitable for water-deficient dry farming areas, and the fertilizer production process is complicated and the cost is high

Although the existing special fertilizers for sweet potatoes are more beneficial to the growth of sweet potatoes than general-purpose fertilizers, there are still some shortcomings. For example, the nutrient release of fertilizers cannot well meet the needs of sweet potatoes, and the sweet potatoes are easy to defertilize in the later stage of growth, and fertilizers cannot be realized. Synchronized Nutrition with Sweet Potato Growth