By Azadirachta Indica Hardman
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CULTIVATION 43 to act as a wind-breakers; flanking them were two rows of other trees and six rows of shrubs to act as a protective barrier against browsing damage. Desh Raj (1990) developed land which was without any vegetation but had large patches of white salts. Neem did not grow well on this soil. Mohan et al. (1990) observed that neem grew best in clay soil. To confirm this, the authors used various potting mixtures by using different doses of soil and fertilizers. The mixture of sand-clay-farmyard manure with 30ppm nitrogen and 20ppm phosphorus was found to be the best.
It cannot bear frost or high humidity or water-logged conditions. It is light demanding and is often cultivated near human habitation for its multifarious uses and also as an avenue or roadside tree. Champion and Seth (1968) mentioned its occurrence in tropical dry deciduous thorn forest and in tropical dry evergreen forest as follows: • • • • Southern tropical dry deciduous forest Southern tropical thorn forest Tropical dry evergreen forest Northern tropical thorn forest DISTRIBUTION ALL OVER THE WORLD The naturalization of A.
1995). Isolation of azadirachtins On a small scale, azadirachtin may be isolated from the seed by the method given in Figure 7. The seed, after extraction with hexane, yields oil and a paste. This paste is first extracted with ethanol and then with chloroform to get crude azadirachtin, which may be about 20 gm from one kg of seed in some samples from India, but the yield varies from sample to sample. Variation in azadirachtin in different samples Twenty-one samples of neem seed, representing eight agro-ecological zones of India, were tested for azadirachtin and biological activity (Ketkar and Ketkar, 1993).