Dynamics of spatial variability growth and yields of three sites in Niger, West-Africa, and applications for precision agriculture research

M. Grandah, A. Stein, J. Brouwer, J. Bouma

Research output: Contribution to journalArticleAcademicpeer-review

16 Citations (Scopus)

Abstract

This paper focuses on possibilities for using a simple scoring technique to make estimates of millet yield. Estimates are intended to be used for defining application rates of manure in the context of low-tech precision agriculture. Yields from 1995 and 1996 at three locations were related to scoring, soil data and elevation. Kriging was used to interpolate point data to areas. Several procedures for pattern comparison were applied. Because scoring data were available at a much higher density than yield data a sensitivity analysis was made to compare scoring and yield. Correlations between scoring and yield ranged from 0.42 to 0.91. During a separate experiment the optimal time for scoring turned out to be approximately 3 months after seeding for the local varieties of 120 days, but 2 months is convenient for farmers to locally apply chemical fertilizer. R2 values ranging from 0.15 to 0.60 were observed for soil data and yield, subject to local conditions and changes in weather. We conclude that scoring is a cheap and reliable procedure to identify field patterns which can form the basis for precision agriculture.
Original languageEnglish
Pages (from-to)123-140
JournalAgricultural Systems
Volume63
DOIs
Publication statusPublished - 2000

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