How much salinity level these plant can tolerate and under what specific conditions of soil; texture and drainage as well as climatic conditions e.g. temperature, evaporation and rainfall?
Both the trees will grow well upto pH of 8.5 or even more. I have seen these trees growing well where soil is affected with salinity. However water stagnation will affect the growth neem trees. Drainage is very much required for getting good growth of these trees. climatic conditions wise arid and semi arid are more suitable than temperate climate. Sandy clay loam to sandy loam soils are very much suitable for these trees