Efficiency of some selected organic wastes as nitrogen fertilizer for Chinese kale (Brassica chinensis L.) and baby corn (Zea mays L.) planted in Kamphaeng Saen soil series
1995
Chaisit Thongjoo
Four kinds of organic waste materials (OWM), namely castor meal (CM), activated sludge cake (AS), compost (CP) and effluent from biogas (EFB) production were tested as nitrogen fertilizer for Baby corn and EFB for Chinese kale planting in Kamphaeng Saen soil series. The field trials were conducted by applying the same designed treatments to the same plots consecutively 3 crops for Baby corn and 5 crops for Chinese kale. In Chinese kale case, the EFB was proved to be an effective source of nitrogen for the crop equivalent to chemical fertilizer (IF) as much as 86-90 percent of 20 kg N/rai where as combination of EFB and IF (1/2EFB+1/2IF) could produce crop yield equivalent to the full dose of IF. In baby corn case, the OWMs either sole apply or combined with the IF, could be equivalent to 15 kg N/rai of IF in terms of plant height, harvesting time, pod yield, pod number per plant, undehusked per dehusked ratio and the contents of N in both straw and pod. EFB could replace irrigational water for the whole planting period of both crops. It could substitute irrigational water 280,000 L/rai for the Chinese kale and much as 196,000 L/rai for whole water consumption of Baby Corn. Long-term application of OWMs did not affect the soil chemical properties such as pH, salinity, N, P, K, Ca, Mg, Na, Zn and Cu. On the other hand, the soil physical properties, such as bulk density, state of aggregation, were likely improved.
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