Environmental variability and multiple site-multiple season trials
1984
Somel, K. (ICARDA, Aleppo (Syria). Farming Systems Program)
An approach is proposed whereby information from multiple season-multiple site experiments can be used efficiently towards the objective of taking environmental variability into consideration. Results pertaining to drilled barley (cv Beecher) from the trials conducted by the Farming Systems Program, across the rainfall transect in Aleppo province, Syria between 1979 and 1983, are used to illustrate the approach. The indications are that (a) economically optimal fertilizer recommendations for average environmental conditions would pay off around 80% of the time, (b) environmental information would have a positive value in increased net returns and increased production, and (c) increases in marginal rates of return would cause fairly rapid decreases in fertilizer use
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