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印度拥有的牲畜总数占世界1/3,皮革出口为国家挣得大量外汇,记林业上已发现300多种含单宁的植物,但提供的产量从来不是令人满意的,而且,这些植物的单宁含量大约只有10%～20%,和进口的原料如Quebracho,Valonia荆树相比,是相当低的.在第二次世界大战期间,印度和南非的贸易关系中断,制革工业因单宁原料不足而受到挫折.因此,便开始了大规模地种植荆树,为拷胶工业提供树皮,为当地群众提供燃料.商业上所说的荆树包括如下Acacia属的4个种:
India has about 1/3 of the world’s livestock and leather exports make a lot of foreign exchange for the country. More than 300 species of tannin plants have been found in the forestry industry, but the yields provided have never been satisfactory. Moreover, Tannin content of only about 10% to 20%, and imports of raw materials such as Quebracho, Valonia wattle compared to quite low during the Second World War, the trade relations between India and South Africa interrupted the tanning industry due to tannin raw materials Therefore, they started planting large-scale tree wattle, grafting industry to provide bark for the local people to provide fuel.The business said the king of Acacia include the following four species: