Special granular fertilizer suitable for saline-alkali land, and preparation method thereof

Abstract

The invention discloses a special granular fertilizer suitable for saline-alkali land, and a preparation method thereof, wherein the special granular fertilizer is prepared sequentially from a core material layer, a sustained-release layer, a soil action layer and a coating layer according to a certain ratio from inside to outside, and the granular fertilizer having the four-layer coated structureis obtained through multiple granulation. According to the present invention, the coating layer in the granular fertilizer can prevent the granular fertilizer from deliquescene before the applicationinto the soil so as to maintain the high fertilizer efficiency; after the special granular fertilizer is applied into the saline-alkali land soil, the added coating layer is dissolved under the action of the water of the soil layer, and the fertilizer in the soil action layer is gradually released into the peripheral saline-alkali land, such that the saline-alkali land soil is subjected to targeted improvement to the maximum extent; when the saline-alkali land is repaired to a suitable planting state, the core material layer mainly for nourishing crops is slowly released under the action of the sustained-release layer, such that the fertilizer in the core material layer is not affected by the saline-alkali land soil so as to act on the crop growth to the maximum extent; and various layerrespectively provide the effects in the targeted manner so as to achieve the optimal effect of the granular fertilizer.

Description

technical field

[0001] The invention belongs to the field of fertilizers, in particular to a special granular fertilizer suitable for saline-alkali land and a preparation method thereof. Background technique

[0002] Throughout the history of agricultural development at home and abroad, the history of improvement and utilization of saline-alkali land is accompanied by the development of agriculture. With the rapid development of human civilization and science and technology, the research work on the improvement and utilization of saline-alkali land is also advancing with the times. The improvement and utilization of saline-alkali land is a complex systematic project, and there are different effective improvement methods for different types of saline-alkali land, but they can be summarized into three categories, namely physical improvement, chemical improvement and biological improvement.

[0003] Among the many saline-alkali soil improvement methods, the plant improvement t...