Comparison between slow-release nitrogen fertilizers and sulphate of ammonia for use in rain-fed rice cultivation in northern Ghana

Carson, A.G., AGC: Crops Research Institute, P.O. Box 52, Nyankpala, Tamale,Ghana; JEQ: Grains Department Board, P.O.Box400,Kumasi,Ghana

Comparison between slow-release nitrogen fertilizers and sulphate of ammonia for use in rain-fed rice cultivation in northern Ghana

1977

Carson, A.G., AGC: Crops Research Institute, P.O. Box 52, Nyankpala, Tamale,Ghana; JEQ: Grains Department Board, P.O.Box400,Kumasi,Ghana

The efficiency of slow-release N fertilizers which are applied once at planting was compared with the standard practice of applying sulphate of ammonia split at planting and at maximum tillering stage in field trials from 1973 to 1975. Split application of sulphate of ammonia (SA) gave higher yields than either the sulphur coated urea (SCU) or the isobutylidendiurea (IBDU) fertilizer under non-permanent flooded conditions, although differences were not significant. However, SCU was more efficient under permanent flooded conditions than under non-permanent flooded conditions. There were also no significant differences in the response to the rice cultivars to the various N sources The trend was for SCU to provide optimum grain yields when applied at time of planting.

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