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日本长崎试验农场采用浸泡法从苦楝树的叶和果实中提出了一种苦楝生长素,对水稻有大幅度的增产效果,其作法是:将苦楝树的叶子和果实铡碎,然后按重量比1:50加水浸泡24小时,过滤其渣;将渣加第一次水量的1/5作第二次浸泡;两次滤液混合后煮沸待自然冷却后即可用。在水稻生长期的第45天和抽穗期间各喷雾一次这种浸泡液,每公顷水稻的产量比对照组增加了1050公斤。苦楝生长素制作方法简便,农户自己可就地取材制作,值得推广。
Japan Nagasaki experiment farm by soaking from the neem tree leaves and fruits put forward a kind of neem growth hormone, has a significant yield increase effect on rice, its practice is: neem tree leaves and fruits broken, and then by weight Than 1:50 water soak for 24 hours, the filter residue; the first increase of slag plus one fifth of the amount of water for the second immersion; twice the filtrate after boiling to be used after the natural cooling. This soaking solution, sprayed once on the 45th day of rice growing season and heading stage, increased the yield of rice by 1050 kg per hectare compared with the control group. Neem auxin production method is simple, farmers themselves can make local materials, it is worth promoting.