Effect of Organic Manure on Crop Yield in Long term Field Experiments

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Date
1987
Authors
Wadman W.P.
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Abstract
The effect of organic manure (OM) on sugar beet and potato yield was examined in long-term field experiments with different nitrogen (N) fertilization rates. A method is given for calculating the confidence interval for maximum yield in these experiments. It was found that this confidence interval could be very high, caused by heterogeneity in the field and a too narrow range of N fertilization rates tested. In some experiments, the effect of OM may be attributed to nutritional effects. Slow release of N from organic matter did not always increase crop yield. It is suggested that slow release of N from OM may raise yields considerably under conditions when a substantial part of the inorganic N applied at the start of the growing season would be lost. For a better understanding of the effect of OM on crop yield, the processes involved require more study.
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Bulletin, 15, p. 83-89
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