Method for improving lime concretion black soil by using crop straw biochar

Abstract

The invention relates to a farmland soil improvement method, particularly to a method for improving lime concretion black soil by using crop straw biochar, and solves the problems of heavy viscosity, poor tilth and the like in the lime concretion black soil. In farmland soil with low productivity of the lime concretion black soil, crop straw biochar is applied into field ditches, and covered and buried with soil. The farmland is firstly ditched, and the biochar is applied into the field ditches, thereby improving the physical behaviors of the soil, enhancing the water retaining capacity of the soil, and increasing the absorbing capacity of crops for water and fertilizers in the soil. The biochar is additionally applied on the basis of the traditional farmland soil tillage mode, thereby fundamentally achieving the goal of improving the lime concretion black soil; and the method has the advantages of wide raw material sources, low cost and simple application process, is capable of reducing the air pollution caused by straw incineration and increasing the fixed carbon content in soil, and has huge popularization and application values.

Description

technical field [0001] The present invention relates to a method for improving soil, in particular to a method for improving sandy ginger black soil by using crop straw biochar. Background technique [0002] With the advancement of urbanization, the area of ​​cultivated land has been continuously reduced, coupled with the extensive use of chemical fertilizers, the soil structure has been damaged to varying degrees, and the soil quality has declined significantly, which has seriously affected my country's food self-sufficiency and food security. The reduction directly caused a net loss of about 2.7037 million tons of grain production [Hong Shuman, Hao Jinmin, Zhou Ning, et al. The change of cultivated land in the Huanghuaihai Plain and its impact on the change of grain production pattern. Journal of Agricultural Engineering, 2014(21):268-277] . Therefore, it has certain practical significance for soil improvement in middle and low-yield fields. Shajiang black soil is an impor...

AI Technical Summary

Problems solved by technology

The specific performance is that the soil texture is sticky and heavy, shrinking when dry and swelling when wet, prone to drought and waterlogging, and poor soil tillability, which is not conducive to the growth of crops and seriously restricts the increase of grain production.

In recent years, the straw returning technology has been widely used in various regions of my country. The returning method mainly relies on direct returning to the field. A large amount of wheat and corn straw returning to the field has shown many benefits, such as increasing soil organic matter and reducing soil bulk density. However, due to the straw decomposition rate Slow, the rotation interval of wheat and corn is short, and the amount of straw returned to the field is huge every year. In addition, the sandy ginger black soil is sticky and heavy. It affects the growth of crops and aggravates the pests and diseases of farmland, so it cannot fundamentally overcome the obstacle of low quality of Shajiang black soil

[0004] In recent years, the utilization of straw resources has attracted people's attention. According to statistics, my country produces about 700 million tons of crop straw every year. Due to the low economic benefits of straw utilization, farmers often burn straw directly on the spot in order to save costs, causing serious air pollution.