1. Appropriate castration period
The forage yield per unit area and the content of various nutrients depends mainly on the harvest time of the forage. To determine the proper harvest time for forage grasses, it is necessary to consider grass species factors, which must be different depending on species, and should not be applied mechanically. For example, for the purpose of modulating hay, perennial legume forages are suitable from flower buds to flowering stages, and grass headings are suitable for heading stage. When grasshoppers are used, they should be harvested at the jointing stage. Annual one-year legumes are poorly regenerated and should be cast in the later stages of the scab.
2, cutting frequency and cutting interval
Harvesting through multiple harvests through timely harvesting techniques does not mean uncontrolled frequent cutting. In order to ensure long-term high yield and stable production of grassland, it is necessary to strictly control the number of cuttings for forage grass. Taking alfalfa as an example, the number and spacing of cuts in different regions are different. In Beijing, it can be cut 4 to 5 times a year, while in the northeast and Inner Mongolia, it can only be cut 2-3 times, in the southern part of North China. The Huaihe river basin in southern Henan and northern Jiangsu can be castrated 5 to 6 times. In addition, the last cut should be carried out at the time of 2-4 weeks before the winter solstice is stopped; most gramineous forage grasses are suitable for harvesting at the heading stage, and can be cut after 30-40 days.
3, the height of stay
The height of stubble left by castration also has a great influence on forage yield, quality, regeneration of forage grass, and growth in the following year. Different species of forage have inconsistent regenerative growth points and require different heights of stubble. In general, alfalfa germinating new shoots from rhizomes in legume forages generally has a height of 4 to 5 cm. Grass growing in grass. For example, bromegrass, ryegrass, cat's tail, and icegrass, etc., are generally 6 to 8 cm in height, and some grasses that sprout new shoots from stem buds and shoots are required to have a height of 20 cm or more in order to facilitate their restoration. regeneration.
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