Utilization of sludge compost from rural sewage system for vegetable cultivation in open field
2005
Morinaga, S. (Kochi-ken. Inst. of Agricultural and Forest Science, Ino (Japan)) | Kitamura, A.
In order to utilize sludge from rural sewage system in agricultural lands, chemical properties of sludge and rice husk compost (hereafter, compost) were clarified and its utilization for vegetable (sweet corn and potato) cultivation in open field was examined. 1. The compost contained moisture at 21.4-62.6%. Its fertilizer components were total nitrogen at 1.8-2.4%, total phosphates at 2.1-3.9%, and total potassium at 0.4-0.8%. The C/N ratio was 14.0-19.0. Arsenic, cadmium, and mercury were all below the levels permitted by the Fertilizer Regulation Law. 2. The compost is expected to be about 60% as efficient as a basal nitrogen fertilizer in replacing one third of chemical fertilizers for sweet corn (tunnel mulch cultivation) and about 40% as efficient in replacing one half of the chemical fertilizers for potato (autumn crop). 3. The compost applied tends to increase total carbon. CEC. and porosity in soil and is expected to function as a soil conditioner. 4. The continuous use of the compost was found to increase total zinc, available zinc, and available copper in soil The increased use of the compost raised zinc content markedly in the stems and leaves of sweet corn and potato. It also tended to increase zinc content in the edible parts of sweet corn and new potato tubers. Copper and cadmium contents were almost unchangeable in the edible parts of sweet corn and new potato tubers.
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