Efficiency of some selected organic wastes as fertilizer for upland crop planted in Kamphaeng Saen soil series
1992
Uaichai Bunyanupong
Four kinds of organic waste materials (OWM) namely activated sludge cake (AS), castor meal (CM), humus (HM) and rice straw compost (RSC) were tested as nitrogen fertilizer for rice planted under upland condition in Kamphaeng Saen Soil Series. There were laboratory and pot experiments. The results from the laboratory experiment were more or less the same as those from the pot one in the way that N mineralized for the OWMs and chemical fertilizer could be ranked in the decreasing order as: CM=HM=ASRSC and application of IF with OWM increased the mineralized N. Efficiency of the OWMs as N-fertilizer for rice could be ranked in the following decreasing order: CM=IF=RSC=HMAS. In terms of method of application, sole application of OWM proved to be the lowest efficient whereas there was not much different in yield between those treated with combined application 1/2 (OWM+IF) and split application 1/2 OWM+1/2IF. However, N-recovery of rice in the split application was remarkably the highest. Nitrogen content in the grain and straw could be ranked in decreasing order as: IFASCMRSCHMcheck. Long-term application of OWMs effected plant nutrient in soil and soil fertility. Continuous apply of RSC would increase soil Ca and Mg whereas application of AS would increase available P in the Kamphaeng Saen Soil.
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