Green manure seed
Green manures are particular plants which are grown to improve the structure and/or the fertility of the soil. They break up heavy soils and improve drainage. They can help light soils hold more water. Different green manures have roots of differing depths. These can mine for different minerals in the soil, bring them to the surface and keep them there. Green manures of the Legume family increase Nitrogen in the soil which will benefit the following crop. Some, such as Alfalfa, root down very deep and bring up minerals to the top layer of the soil. The green tops, when dug in, add humus and nutrients.
Turn the plants into the soil at the appropriate time for each variety. Some Green Manures can be clipped during their season and these clippings can be left on the soil to be dug in eventually to improve the tilth still further.
Overwintered Green Manures, such as Clover, Alfalfa, Vetch, Field Beans and Ryegrass, will keep the ground covered and so protect the soil and help prevent the leaching of nutrients.
If used in a rotation system, check the family of plants being used. Red Clover, for example, being a Legume would fit into a rotation in place of beans, and would be followed by a leafy vegetable such as spinach or lettuce.
MAIN GROWING SEASON
Sow a quick-growing Green manure (such as Mustard, Buckwheat or Fenugreek), fitted in before sowing a second vegetable crop on that patch of ground.
Sow a Green manure that will keep the ground covered and protected over the winter (such as Red Clover, Field Beans, Alfalfa, Vetch (Tares), Annual Ryegrass or Phacelia)
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