How to improve the saline soil?

1, chemical improvement:

Chemical improvement of saline and alkaline land chemical improvement mainly refers to the addition of chemical substances to the soil, in order to achieve the purpose of lowering soil pH, alkalinity, and improve the soil structure.

The main chemical amendments include gypsum, phosphogypsum, desulfurization gypsum, sulfur, humic acid, furfural residue and other substances. A large number of research practices have proved that on heavy saline and alkaline land, the use of chemical improvement combined with other improvement measures can achieve extremely significant improvement effects.

2, physical improvement

Physical improvement through the leveling of the land, guest soil, sand pressure, loosening the soil, lifting the field and other measures to destroy the soil capillary action, blocking salt to the surface of the further aggregation. The large amount of work and high cost of the guest soil method, and the uneconomical economic cost is an important reason that restricts its popularization and application.

3, biological improvement

Biological improvement of saline soil is poor, poor soil fertility. Therefore, in the process of improvement, through the planting of paddy fields, planting saline-tolerant crops, increase soil organic matter content, is an important measure to improve saline.

4, water conservancy improvement

Water conservancy improvement according to the "water and salt movement" law, through the underground seepage pipe salt drainage, combined with ditch, deep well drainage, to prevent the return of salt.

Expanded

Harms of saline and alkaline land:

1, jeopardizing the growth of crops, hindering the development of agricultural production

The soil organic matter content is relatively low. Due to soil salinization, inhibit the process of soil herbivory and soil organic matter accumulation process, thus the soil organic matter content is relatively reduced, thus affecting the physical and chemical properties of the soil.

2, the soil solution directly toxic crop cells

Because of the high concentration of saline soil solution, the osmotic pressure is large, so that the crop absorbs water and nutrient absorption capacity is reduced, at the same time the plant root selective absorption of nutrient ions is also correspondingly reduced.

So non-nutrient ions enter the body in large quantities, and nutrient ion absorption is reduced or not absorbed, thus disturbing the normal ion balance in the body, interfering with the normal metabolic functions of the crop, destroying the synthesis and hydrolysis of proteins, and causing ammonia and soluble salts ions in the body of the accumulation of ion toxicity, jeopardizing the growth and development of the crop, and even death.

3, poor crop growth caused by seedling shortage, yield reduction, death

According to general statistics, non-salted soil crops are not seedling shortage, normal yield, light salted soil seedling shortage to reduce 10-20% (average 15%), in salted soil seedling shortage to reduce 20-50% (average 35%), heavy salted soil seedling shortage to reduce 50-80% (average 65%), salted soil can only be individually viable. No harvest.

According to the irrigation area salinization surface area of arable land and the current annual crop planting ratio, roughly estimated agricultural division of the annual crop yield loss: 44 million kg of cotton, about 500 million yuan, the planting industry due to saline losses amounted to 700 million yuan, accounting for about 26% of the total value of the whole agricultural output.

People's Daily Online - Methods and Measures for Saline and Alkaline Land Improvement

Baidu Encyclopedia - Saline and Alkaline Land