الفهرس 
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Abstract
Jatropha curcas is a multipurpose tree, which has potential as an alternative source for biodiesel. All of its parts can also be used for human food, animal feed, fertilizer, fuel and traditional medicine.
J. curcas seed cake is a low-value by-product obtained from biodiesel production. Increasing J. curcas production as a biofuel source will increase the quantity of its seed cake, which is a by-product. The seed cake left after extraction of oil provides high amounts of protein and all concentrations of essential amino acids. Jatropha curcas seedcake contained up to 58 % of crude protein by weight. The percentages of nitrogen (N), phosphorous (P), and potassium (K) were 3.2-4.5 %, 1.4-2.1 %, and 1.2-1.7 %, respectively. It also contains trace amounts of calcium, magnesium, sulphur, zinc, iron, copper, manganese and sodium. One ton of Jatropha press cake contains approximately 51 kg of nitrogen, 18 kg of phosphorus and 13 kg of potassium. It is equivalent to 153 kg of NPK industrial fertilizer having the composition ratio of 15:15:15, based on nitrogen content in press cake.