Abstract
Animal manure is of vital importance in maintaining soil fertility in semiarid west Africa due to the low level of use of inorganic fertilizer. Using data from Niger however, it is shown that insufficient animals are available to provide the manure needed to sustain crop yields on a long-term basis. The limitations posed by animal numbers and feed availability imply that with the increasing intensity of land use in Niger and other countries In the region, manure alone will not provide the key to attaining sustainable yield levels. External Inputs in the form of inorganic fertilizers are needed. However, the gap between present fertilizer use and the required level is wide. To ensure the availability and increased use of fertilizers at the farm level, appropriate public policies are needed to ease the constraints that have inhibited the widespread use of fertilizers in semiarid west Africa.
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