| Autor: |
CHATER, MARGARET, GASSER, J. K. R. |
| Zdroj: |
Journal of Soil Science; 1970, Vol. 21 Issue 1, p127-137, 11p |
| Abstrakt: |
In an experiment on green manuring started at Woburn in 1936, farmyard manure (FYM) was applied in alternate years until 1954 and straw similarly from then until 1963. Various green manures were grown from 1936 to 1953. From 1954 to 1963 ryegrass and trefoil were grown either each year or in alternate years; in 1964 and 1965 they were grown each year. After annual cropping without organic manuring the organic-C and total-N decreased from 0·86 per cent and 0·091 per cent respectively in 1936 to 0·76 percent and 0·082 per cent in 1966. Ploughing in straw alone approximately halved the loss. FYM and green manures both maintained the original percentages of soil C and N. The effect of FYM and straw applied together was approximately the sum of the effects of FYM and straw applied separately. Of the green manures ploughed in, trefoil returned the most nitrogen to the soil. Trefoil increased and ryegrass decreased the mineralizable-N in the soil. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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