Alkaline land soil repair agent

Abstract

The invention relates to a restoration agent for saline-alkali land soil, which consists of free gypsum dehydration, nature organic substance, microbial fertilizer and inorganic nutrient with weight ratio of 60-70:25-35:1-4:3-6; the content of dihydrate calcium sulfate in the free gypsum dehydration is over 80 percent; the nature organic substance consists of weathered coal and grass carbon with weight ratio of 1.0:0.93; the content of effective bacteria in the microbial fertilizer is 2.0 hundred millions / g; and the inorganic nutrient consists of urea, ordinary superphosphate and potassium chloride with weight ratio of 1.0:2.42:075. The restoration agent can utilize calcium ions in the free gypsum dehydration for replacing sodium ions in the soil so as to lower the alkalinity in the soil and provide calcium and sulfur elements for crops, while the nature organic substance can lower and regulate the slat content and the alkalinity in the soil. In addition, the nature organic substance, the microbial fertilizer and the inorganic nutrient can supply large amount of nutrient elements such as nitrogen, phosphorus, potassium and the like to the crop for normal growth, thereby being capable of improving the yield of the crop.

Description

technical field [0001] The invention relates to a soil restoration agent, in particular to a saline-alkali soil restoration agent. Background technique [0002] Soil salinization has become a worldwide problem. At present, the area of ​​saline soil in the world is about 10 million km 2 , our country is 991,300 km 2 . There are large areas of coastal saline soil along the Bohai Sea, Yellow Sea, and East Coastal Plain along the coastline of more than 18,000 kilometers in my country, about 80% of which have not been utilized. Therefore, the improvement and restoration of saline-alkali land is a very important task. [0003] At present, one of the chemical methods used to control saline-alkali land is to apply amendments to the soil. There are many kinds of existing soil conditioners, which are mainly divided into two categories: solid and liquid. Wherein the production process of the liquid soil conditioner is relatively complicated, the cost is high, the use is also relati...

AI Technical Summary

Problems solved by technology

Among them, the production process of the liquid soil conditioner is relatively complicated, the cost is high, the use is also relatively troublesome, and the aftereffect is short.

The composition of inorganic solid soil conditioner is relatively single, the effect is poor, and most of them are used to improve alkaline soil, but the effect of improving and repairing saline soil mainly containing salt is poor. When the by-product, desulfurized gypsum, is used as a soil improver, it is mainly used to reduce the alkalinity of alkaline soil, but it has little effect on reducing the salinity content of the soil, and cannot provide the crops with the required nitrogen, phosphorus, Potassium and other nutrients and organic matter cannot increase the biological activity of the soil (see "Application Effect of Flue Gas Desulfurization Waste in Alkaline Soil Improvement" 2005 / 04 "Sino-Japanese Cooperation on Alkaline Soil in Shanxi Province Improve on-site municipal survey" 2002 / 03)