Grown for its seeds, mustard, as fodder crop or as a green manure, it is now widespread worldwide, although it probably originated in the Mediterranean region.
42.
Often, green manure crops are grown for a specific period, and then plowed under before reaching full maturity in order to improve soil fertility and quality.
43.
*Leguminous green manures such as clover and vetch contain nitrogen-fixing symbiotic bacteria in root nodules that fix atmospheric nitrogen in a form that plants can use.
44.
L�hnis was the first to discover the priming effect phenomenon in 1926 through his studies of green manure decomposition and its effects on legume plants in soil.
45.
In an organic system, which relies on crop rotations, animal manures, green manures and biological pest control, the soil grows richer and richer, more and more fertile.
46.
It often is applied as mulch or green manure in local gardens, which however, must be grown beyond the shade of the extremely dense canopy of the tree.
47.
Limitations to consider in the use of green manure are time, energy, and resources ( monetary and natural ) required to successfully grow and utilize these cover crops.
48.
For example, common vetch or hairy vetch is planted together with rye or winter wheat to make a good cover crop or green manure ( or both ).
49.
Organic farming relies heavily on the natural breakdown of organic matter, using techniques like green manure and composting, to replace nutrients taken from the soil by previous crops.
50.
For example, green manure from legumes can lead to an invasion of snails or slugs and the decay from green manure can occasionally suppress the growth of other crops.
