Saline-alkali land improving agent and method by using same to improve land for rice planting

Abstract

The invention discloses a soda type saline-alkali land improving agent for rice planting, and a method by using the same to improve land and plant rice after land improving. The saline-alkali soil improving agent is prepared from the following raw materials in parts by weight: filtered mud of a sugar refinery, sulfamic acid, ferrous sulfate, aluminum sulfate, zinc sulfate and glucurolactone. The saline-alkali soil improving agent has the advantages that the soda type saline-alkali land for the rice planting is improved by the multiple components at multiple aspects, the proper pH (potential ofhydrogen) value and degree of alkalization are provided for the rice growth, the rice can be planted after the saline-alkali land is improved, and the output of the rice per mu can reach the medium and high output after the improving agent is used for two to three years; by containing the filtered mud of the sugar refinery, the sodium ions in soil sol are replaced by calcium ions in the filteredmud of the sugar refinery, so that the purpose of decreasing the degree of alkalization is realized, and the filtered mud of the sugar refinery contains about 45 to 55% of calcium carbonate and 20% oforganic matter.

Description

technical field [0001] The invention relates to the technical field of saline-alkali soil improvement, in particular to a saline-alkali soil improvement agent and a method for planting rice after improving land using the improvement agent. Background technique [0002] Due to the poor physical and chemical properties of the soil and the high content of water-soluble anions and cations, saline-alkali land is not easy to be used beyond the tolerance limit of crops. Therefore, the improvement of saline-alkali land should be comprehensively considered from the perspective of improving soil physical and chemical properties, reducing the content of water-soluble anions and cations, and planting management. Specific improvement methods. [0003] At present, the methods of improving saline-alkali land in China are roughly summarized as follows: (1) chemical improvement: application of desulfurized gypsum, phosphogypsum, superphosphate, various organic acids, etc.; (2) physical impro...

AI Technical Summary

Problems solved by technology

For example, desulfurization gypsum improves saline-alkali land, which can reduce soil pH and alkalinity, but desulfurization gypsum itself has low solubility and requires a large amount of water as a medium, which may further increase soil salinization in areas with high groundwater levels; underground pipe drainage Salt technology has little effect on alkaline soil, and cannot improve soil structure, reduce soil alkalinity and salinity; planting saline-alkali-tolerant plants is only effective for salinity within a certain threshold, and climate and planting habits must also be considered , supporting machinery, economy and other factors

At present, the methods of improving soda-type saline-alkali land mainly adopt desulfurization gypsum or various organic and inorganic acids, but the effect is not good.

Soda-type saline-alkali land has high alkalinity, fine soil particles, poor dispersion in water, easy to form a water-repellent layer, and it is difficult to react with water media; and desulfurization gypsum has low solubility in water, resulting in slow onset of action and easy drainage drain

The cost of organic acid and inorganic acid is high, the improvement process is difficult and difficult to operate, and it has little effect on reducing the degree of alkalization and improving the properties of soil particles

[0004] Chinese patent application 201610542432.3 discloses a method for improving saline-alkali land based on rice planting, mainly for saline-alkali land with a salt content of 2-5g / kg and a pH value of 7.5-8.5. This method has an improvement effect on limited saline-alkali land, but the improvement cycle is long, the amount of improver is not based, and the applicability of the saline-alkali land beyond the limit is poor

[0005] Chinese patent application 201610450531.X discloses a saline-alkali land improver, which can reduce soil alkalinity to a certain extent and increase soil salt discharge rate, but the preparation process is cumbersome, and chrysanthemum, saponin, and mulberry leaves need to be added The cost of medicinal plants such as Radix isatidis is high, and it is only limited to soil salinization and soil improvement in the northeast region, and its applicability is also poor

[0006] Chinese patent application 201310069798.0 discloses a saline-alkali land improvement method, which can improve soil properties to a certain extent, but is poor in reducing soil pH, reducing carbonate and bicarbonate ions, and may increase soil salinity