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The present study focused on utilization of the de-oiled Jatropha cake, a bio-waste from the bio diesel extraction process, as organic fertilizer. Tomato crop was sub-jected to different treatments comprising varying composition of the Jatropha cake fertilizer, applied at varying age of plant life-cycle. The impact on yield, morpho-logical and nutritional parameters was studied. Results revealed that an optimal (2-3 % by weight) dose applied on the soil at the time of onset of flowering (around 45 days), significantly enhanced the yield along with improvements in morphologi-cal parameters. There were significant improvements in key nutrients viz. protein, vitamin C and reducing sugars. High value of key nutrients like TSS (total soluble solid), vitamin C, proteins, reducing sugar and tomato fruit yield were obtained with soil + 3% cake mixed in 60 day transplant. These results indicate that composted de-oiled Jatropha cake has tremendous po-tential of being utilized in a cost effective way as tailored organic fertilizer, as a replacement of chemical fertilizers.

Bio-diesel waste as tailored organic fertilizer for improving yields and nutritive values of Lycopercicum esculatum (tomato) crop