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To compare methods for determining the onset of the growing season in the Sudan savanna of northern Nigeria.

A comparison of methods to determine the onset of the growing season in northern Nigeria

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To compare methods for determining the onset of the growing season in the Sudan savanna of northern Nigeria.
Comparison of five methods for determining rainfall onset: Ramadan, Walter's, Sivakumar's, Kowal's, and Benoit's methods.
Evaluation of their effectiveness spanning from 1961 to 1991.
Development of an improved technique by combining Kowal's and Sivakumar's criteria.
Walter's method predicted early onsets, while Sivakumar's predicted late onsets, compromising the growing season.
Kowal's and Benoit's methods fell between the performances of Walter's and Sivakumar's methods.
A combined method effectively determined onset dates, though some false starts persisted.

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Randomized trial compares methods for identifying growing season onset in northern Nigeria, suggesting improved prediction techniques.

Ati et al. (2002) studied this question.

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