Publication Date:
1957-02-01
Description:
Green manure crops were ploughed down in the fallow year of a fallow, wheat, corn, wheat rotation to determine their effect on total organic carbon and nitrogen in the soil and on crop yields.An average decrease of 27.9 per cent of the organic carbon and 15.9 per cent of the nitrogen in the soil occurred over a 25-year period. Under sweet clover and farm manure the levels of organic carbon and nitrogen were significantly higher than the levels of these constituents under fallow treatment. The levels of organic carbon and nitrogen were not significantly affected by weeds, buckwheat, corn, rye, peas and red clover green crop treatments.There was little crop yield response to nitrogen-supplying green crops the first year after fallow. However, during recent years there was a gradual increase in yield response to nitrogen-supplying treatments in the second and third crops after fallow. This increased response to nitrogen probably reflected the gradual decline in the ability of the soil to supply nitrogen as total soil organic matter declined.
Print ISSN:
0008-4271
Electronic ISSN:
1918-1841
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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