Properties and the effect on the growth of leafy vegetables of the livestock waste pellet fertilizer with chemical fertilizer added
2007
Miyazaki, N.(Tochigi Prefectural Coll. of Agriculture, Utsunomiya (Japan)) | Yoshida, T.
We developed pellet fertilizer from livestock waste by adding chemical fertilizer and clarified the properties and its effect on the growth of leafy vegetables. The water content of raw livestock waste was reduced to about 15% using a dryer and formed into a pellet shape with a pressurizing machine after adding urea, fused magnesium phosphate fertilizer and potassium chloride. By further drying, the dry livestock waste fertilizer was made. The chemical component of the fertilizer was adjusted to the desirable value by analyzing the chemical component of the raw livestock waste and adding the necessary amount of chemical elements. The fertilizer was uniform in quality and the contents of nitrogen, phosphoric acid and potassium were approximately 5%, 5% and 5%, respectively. When sealed in resinous bags, it could be stored for a long time without quality change. The product weight of the fertilizer was one-third of the raw material. The heavy-metal content was low and the total coliform was less than the limit of detection. During incubation at 30 deg C, the livestock waste fertilizer maintained almost the same nitrogen mineralization rate as the commercial organic pellet fertilizer. Pot experiments showed that the livestock-waste fertilizer had no negative effect on the germination and the growth of komatsuna (Brassica rapa var. peruviridis). The yield of komatsuna and spinach cultivated by applying the livestock waste fertilizer was the same as that cultivated by applying the organic fertilizer in the market.
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