Method for regulating and controlling limited downslope tillage of corroded slope farmland

Abstract

The invention discloses a method for regulating and controlling limited downslope tillage of a corroded slope farmland, which comprises the following steps of: firstly dividing each land block on the slope farmland into a plurality of small farming units along the contour direction; and then carrying out downslope tillage on each farming unit. The land blocks are respectively divided into a plurality of small farming units through horizontal ditches or ridges. In the invention, flow lines of sheet flows are cut by dividing the length of the slope; a runoff quantity hydrograph is smoother than that of the original slope surface; the water flow speed of the slope surface is reduced; the resistance time of the sheet flows on the slope surface is prolonged; infiltration is increased; the surface runoff is reduced; the sediment transport capacity of the flow is obviously reduced; soil losses are greatly reduced; and the water and soil conservation capacity of the slop farmland can be effectively improved. The method is simple, convenient and labor-saving to operate, can achieve the effect on soil and fertility conservation by adopting simple measures, has small investment and a low cost and has the characteristics of high efficiency, practicality, convenience for farmers to receive and the like.

Description

A limited down-slope farming method for controlling erosion on sloping farmland technical field The invention relates to an agricultural cultivation method, in particular to a method for regulating and controlling erosion on sloping farmland with limited slope along the slope, and belongs to the technical field of sloping farmland farming and soil erosion prevention and control. Background technique The sloping land is the main production carrier of commercial grain crops in the Three Gorges Reservoir area, and it is also the main source of soil erosion and sediment in the Three Gorges Reservoir area. The area of ​​sloping cultivated land in the reservoir area is about 686,000 hm2, which is one of the areas with the most concentrated sloping cultivated land in China. Nuclide tracers show that the purple soil slope farmland in the Three Gorges Reservoir area has strong water and soil loss, and the erosion rate is much higher than that of forest and grassland. More than 6...

AI Technical Summary

Problems solved by technology

In the past 20 years, the Three Gorges Reservoir area has adopted engineering measures such as "slope to terrace" and achieved remarkable soil and water conservation effects. However, the horizontal terraces have a large amount of engineering (earth volume 3000-6000m3 / hm2) and high cost (30,000-100,000 yuan) / hm2, which does not include supporting investment in slope water systems), the terraced ridge occupies a large area (7%-12%), and requires high-intensity manpower and material resources

Therefore, this farming method leads to serious loss of water, soil, and fertilizer in sloping farmland, and it is a farming model for sloping farmland that needs to be improved.

Cross-slope farming is a new slope farming method proposed for soil and water conservation. However, it is difficult to popularize and implement it when a large number of rural laborers are transferred and farmers are not aware of water and soil conservation. Moreover, complete cross-slope farming is easily affected by rainstorm runoff. Scrubbing doesn't look right

Therefore, there is currently a lack of a low-input, easy-to-operate, labor-saving, and effective method for preventing and controlling soil and water loss in sloping farmland.

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