Method for retaining soil nutrients by constructing composite grass strips in red soil slope field

Abstract

A method for intercepting soil nutrients by constructing composite grass strips in a red soil slope field comprises the following steps: (1), grass variety constitution and selection: seeds of at least two grass varieties having different functions and being capable of remaining rapidly available nitrogen, rapidly available phosphorus and rapidly available potassium nutrients in soil simultaneously and respectively are selected; (2), land preparation and fertilization: drilling strips are formed, and fertilization is performed in the strips; (3), presowing treatment of the seeds: the grass seeds are dressed before sowing; (4), sowing: the grass seeds after dressing are spread in the strips and covered with a fine soil layer or a fine sand layer; (5), field management: watering is performed before and after seedling emergence, seedling checking and reseeding are performed, weeds are removed, dressing of a hole applied fertilizer is performed, and cutting is performed. When the method is used, the nutrients of the red soil slope field can be retained substantially, nutrient loss is reduced, the soil fertility is improved, a water eutrophication process is slowed down, and environmental protection is facilitated.

Description

technical field [0001] The invention relates to a method for building a composite grass belt on a red soil sloping farmland, in particular to a method for building a composite grass belt to intercept soil nutrients. Background technique [0002] The red soil is distributed in the hilly land below 300m above sea level and the lower part of the low mountain below 500m above sea level, with a large area, as many as 863.72×10 4 h㎡, accounting for 40.77% of the area of ​​Hunan Province, of which the red soil slope farmland is 17.15×10 4 h㎡, accounting for 1.98% of the total area of ​​red soil, including red soil economic forest (fruit) land and dry farmland, is one of the main land types in southern China. [0003] However, the red soil sloping cultivated land has a relatively large slope, generally >5°, and some even >25°. In order to avoid regular drought, only one season of early spring crops is planted on dry soil, and the ground cover is extremely limited; in additio...

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Problems solved by technology

[0005] However, for the red soil sloping cultivated land with ladder + mulch + grass belt, although the annual sediment loss is close to the allowable erosion value, the loss of soil nutrients is still relatively large

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