Organic fertilizer from neem cake
2000
Suriya Sassanarakkit | Janjarus Verasan | Arunsiri Kumlang | Jirawat Phumphet | Premsuda Saman | Thawal Meploy | Tawich Thumnamuang | Khanok-on Jarujareet | Surasit Chaisawat | Visha Tunvirachaisakul | Praphaisri Somchai | Poonsook Atthasampunna
This experiment was conducted to develop technology for utilization of organic waste from neem extract produced by Agricultural Toxic Substance Division, Department of Agriculture, as an organic fertilizer. The chemical analysis of neem cake showed that it contained several plant nutrients such as nitrogen 5.18 percent, phosphorus 0.46 percent, potassium 0.88 percent and some micro-elements and trace elements. In the laboratory, the mineralization rate of nitrogen from neem cake was studied in two conditions in the lowland (submerged soil) and upland soils. The results showed that the mineralization rate of neem cake released nitrogen about 44.1 percent of total nitrogen in the lowland condition, and 28.5 percent in the upland condition. The neem cake was developed into pellet for testing with various plants in the greenhouse and field trials. In the greenhouse, the effect of neem cake on plant growth and yield was studied with different kinds of plant such as sweet potato, rice, corn and chinese kale. The results showed that the direct application of neem cake at the rate of 20-40 gram/plant could enhance plant growth and increase the yield equivalent to the 16-16-16 chemical fertilizer at the rate of 6.6 gram/plant. In field trails, there were two experiments. The first experiment was conducted in Ayutthaya on the effect of neem cake on sweet potato and the second experiment in Nakhon Pathom on rice and chinese kale. The results showed that the neem cake at the rate of 500 kg/rai could enhance the growth and increase the yield of sweet potato, rice and chinese kale more than the chemical fertilizer formula 16-20-0 at the rate of 25 kg/rai. The feasibility study of neem cake was also conducted and it was concluded that neem cake could be sold at 3 bath/kg with 25 percent profit and the pay back period was 3.8 years.
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