Experimental layout
Three sites of pH9.7, 10.0, and 10.5 were selected for study. The soil characteristics of these sites are shown in Table 1. Three plots each of 0.1 ha at each site were selected by random sampling to study the productivity and change in soil characteristics. Growth data were recorded for up to 5 successive years in the month of January. The growth data for all three plots within one site were averaged to get the representative growth for that particular site. Only areas planted exclusively with Prosopis juliflora were selected for the study.