Method for constructing mixed sowing grassland by reseeding alfalfa in slightly degraded leymus chinensis meadow

Abstract

The invention discloses a method for constructing a mixed sowing grassland by reseeding alfalfa in a slightly degraded leymus chinensis meadow, and relates to a method for constructing an artificial grassland in a degraded leymus chinensis meadow. The invention aims to improve the community structure of the leymus chinensis meadow and improve the yield and quality of forage grass. The method comprises the following steps that 1, in early July, the slightly degraded leymus chinensis meadow is cut, stubbles of 3-5 cm are reserved, and light raking operation is conducted; 2, after light raking operation, alfalfa seeds are sown, the sowing rate is 10 kg / hectare, and after sowing, a compacting machine is used for slight compacting; 3, in the current year of alfalfa sowing, the grassland is forbidden to be cut, the grassland is cut twice every year from the next year, the cutting time is selected at the initial flowering stage of alfalfa each time, and after the first cutting, the grassland is fertilized. According to the method, the yield of high-quality forage grass can be increased by 1.5-2 tons / hectare per hectare, the price of the forage grass is 1000 yuan / ton, the income can be increased by at least 1500 yuan / hectare every year, and the economic benefit in the later period is very considerable. The invention belongs to the field of degraded grassland recovery.

Description

technical field [0001] The invention relates to a method for establishing a mixed sowing grassland in a mildly degraded Leymus chinensis meadow. Background technique [0002] Leymus chinensis meadow in Songnen Plain is the production base of high-quality grass products and animal husbandry in northern China. According to literature records, in the 1960s, the output of meadow grass in this area could reach 3-4 tons / ha. However, after more than half a century of grazing and mowing, grassland degradation has gradually intensified, and the forage yield of natural mowing fields has dropped to about 1 ton / ha; the grassland community structure is single, and the proportion of high-quality pasture is less than 2%. Serious decline, Leymus chinensis meadow in Songnen Plain needs to be improved urgently. [0003] Alfalfa (Medicago Sativa) is a leguminous plant with high crude protein content and biological nitrogen fixation function. It is an excellent forage grass and grassland fert...

AI Technical Summary

Problems solved by technology

However, after more than half a century of grazing and mowing, grassland degradation has gradually intensified, and the forage yield of natural mowing fields has dropped to about 1 ton / ha; the grassland community structure is single, and the proportion of high-quality pasture is less than 2%. Serious decline, Leymus chinensis meadow in Songnen Plain needs to be improved urgently

There have been some limited technical research and development reports on alfalfa re-seeding on grasslands in northern China. For example, Zhang Yingjun and Zhou Jiqiong developed the technology of re-seeding yellow alfalfa in northern meadow grasslands. , less competitive pressure on alfalfa seedlings), it is not suitable for mildly degraded Leymus chinensis meadows (higher plant density, higher competitive pressure on alfalfa seedlings); in addition, this technology does not involve the design of alfalfa re-seeding time, which needs to be further improved Furthermore, the differences in the environmental characteristics of different grasslands determine that the management method after reseeding alfalfa should also be adjusted