green manure

noun Agriculture.
1.
a crop of growing plants, as clover and other nitrogen-fixing plants, plowed under to enrich the soil.
2.
manure that has not undergone decay.

Origin:
1835–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
green manure
 
n
1.  a growing crop that is ploughed under to enrich the soil
2.  manure that has not yet decomposed

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
green manure  
A growing crop, such as clover or grass, that is plowed under the soil to improve fertility. Green manure can also reduce erosion and, if the crop is leguminous, add nitrogen to the soil.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Its ability to grow rapidly and fix nitrogen made it an ideal green manure.
White mustard is also grown as a salad plant, as a forage plant for sheep, and as green manure to be plowed under.
Land managers can greatly improve mine soils by growing green manure crops.
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