Efficiency of some selected organic wastes as nitrogen fertilizer for sweet corn planted in Kamphaeng Saen soil series
1994
Jameekorn Srisumul
Four kinds of organic waste materials (OWM), namely; castor meal (CM), activated sludge cake (AS), rice straw compost (RSC), and effluent from biogas (EFB) production were tested as nitrogen fertilizer for sweet corn planted in Kamphaengsaen soil series. The field experiment was conducted three times. Ten treatments were tested in the randomized complete block design with 4 replications. The results showed that with continual application of the organic wastes, either sole apply or combined with the chemical fertilizer, the corn was proved better than the check and equal to chemical fertilizer (IF) in terms of plant height, tasseling and silking dates. Tasseling was found to be earliest in the 1/2AS+1/2IF. In terms of corn yield, 1/2RSC+1/2IF, 1/2CM+1/2IF, and 1/2AS+1/2IF were proved to be the best treatments and were equal to IF. Long-term application of the said combinations was superior to that of the chemical fertilizer. The contents of N in straw and grain was found highest in 1/2RSC+1/2IF. With three consecutive applications of the organic wastes, there was no change in the soil properties in terms of pH, Eh, Mg content and Na content. However, continual application of RSC, either single or combined with IF, slightly increased soil K and organic matter whereas those of the AS slightly increased soil P and Ca.
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