Understanding variability in soybean yield response to rhizobium inoculants and P-fertilizer on farmers’ fields in Northern-Nigeria

This paper aims to understand the variability in soybean grain yield and soybean’s response to inoculants and P-fertilizer on farmers’ fields in Kano and Northern and Southern Kaduna in Nigeria. It will be based on the data collected with the field books in the rainy seasons of 2011 and 2012, and soil fertility analyses. Main research questions are: - Which factors explain variability in soybean yield and response to inoculants and P-fertilizer? - What is the yield increase that can be achieved with inoculants and P-fertilizer, with which probability and under which circumstances? - To what extent are inoculants and P-fertilizer profitable and for which types of farmers? Methodologies applied: cumulative probability, correlation, multivariate statistics (to be determined; input needed at science meeting)