Method of reorganizing soil layer to fertilize low-yield purple sand slope cultivated land

Abstract

The invention relates to a method for fertility improvement of low-yielding purple-sandy-soil sloping cultivated land through soil layer reconstruction. The method mainly comprises the following steps: laying out excavation lines in selected low-yielding purple-sandy-soil sloping cultivated land in a purple-sandstone hilly region along contour lines from the top of a slope to the bottom of the slope; taking every three excavation lines as one group, firstly, moving surface soil above first and third excavation lines to be between the first excavation lines and second excavation lines so as to form surface soil zones through forting, then, deeply excavating a pit with the depth of 15-25cm between every corresponding second excavation line and every corresponding third excavation line, moving subsoil above the first excavation lines to be above dug-up subsoil so as to construct subsoil zones, forming subsoil ditches above the first excavation lines, and so on; after the beginning of spring, applying a base fertilizer to the subsoil ditches and the subsoil zones, carrying out land preparation, and sowing forage grass; and carrying out watering before and after forage grass seedling emergence, carrying out seedling inspection and replanting, carrying out weeding, carrying out topdressing and carrying out cutting. By using the method, runoff and sand can be reduced, temperature adjustment and moisture preserving can be achieved, and the physicochemical properties of soil can be improved; and grain and oil crops and good-economic-benefit vegetables can be planted instead of the forage grass, and the rate of contribution of the land is increased greatly.

Description

technical field [0001] The invention relates to a method for fertilizing slope farmland, in particular to a method for fertilizing slope farmland with low-yield purple sand soil. Background technique [0002] Zisha soil is developed on purple sandstone and purple conglomerate weathered materials, and is widely distributed in areas where purple sandstone and conglomerate are mainly interbedded with sandstone and shale, so the area is relatively large, with 59.44×10 in Hunan Province alone. 4 h㎡, accounting for 45.4% of the total area of ​​purple soil, of which the slope cultivated land of purple sand soil is about 2.0X10 4 h㎡, 1 / 3 of the area is low-yield purple sand soil. [0003] The main characteristics of the soil fertility of the low-yield purple sand slope cultivated land are: the pH value of the cultivated layer is about 0.2 lower than that of the core soil layer, and the acidity is low; The maturation effect is weak; the sand content of the plow layer is 2.25% highe...

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Problems solved by technology

[0004] Many methods have been adopted to improve low-yield purple sand sloping farmland, including contour tillage (horizontal tillage), contour tillage + bamboo groove, straw mulching, no-tillage and less tillage, and spraying soil protective agents. The effects of these methods are reflected in In terms of reducing water and soil loss (annual runoff is reduced by 21.4%-78.9%, and annual soil erosion is reduced by 30.1%-87.4%), moisture retention (the moisture content of the plow layer is increased by 4.2%-5.7%), temperature control (the temperature is lowered by 2.8-3.4% when the temperature is high ℃, when the temperature is low, the temperature rises 1.7-2.4 ℃), but in terms of fertilization, the effect is very small

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