Fertilizer use on barley in northern Syria: the value of soil nutrient information
1988
Somel, K. | Matar, A. (ICARDA, Aleppo (Syria)) | El-Hajj, K. (Ministry of Agriculture and Agrarian Reform, Damascus (Syria). Div. of Soil Fertility and Plant Nutrition)
Response surfaces are estimated employing pooled analysis with soil nutrient and rainfall varieties along with the experimental factors N and P fertilizer. Response surfaces are predicted from the pooled analysis for 15 different levels of soil nutrients at two levels of the rainfall and the characteristics of economic optima are calculated. Subsequently, the analysis is repeated without the soil nutrient variables. The comparison of the results gives an indication about the value of collecting information on soil nutrients. With current prices this value is around $ 1.3 million per year for zone 2 and 3 in Syria
显示更多 [+] 显示较少 [-]