[Waste utilization for agricultural production]: 2. Application of effluent from biogas production as nitrogen source for mungbean (Vigna radiata (L.) Wilczek) planted after guinea grass (Panicum maximum Jacq.)
1996
Prayoon Peertanain | Supamard Panichsakpatana (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soil Science)
Mungbean was planted after harvesting guinea grass in which the first 3 treatments, th Check (Ch), the effluent from biogas production (EFB), and the chemical fertilizer (IF), were the same plots as before only that the rate of N calculated for mungbean was equivalent to 3 kg N/rai (18.75 kg N/ha). The old 1/2EFB +1/2IF plot was treated with EFB at 3 kg N/rai (designed as EFB2) in order to check the residual effect of the old treatment. The last treatment was EFB3 in which the EFB was used as irrigated water for the whole growing period. The results from the first planting indicated that there was no effect of all treatments to the dry matter of mungbean excluding root part and grain yield. All of the yields of mungbean those treaed with the EFBs and IF were significantly higher than that of the control one. There was no inhibition effect of biological nitrogen fixation (BNF) of mungbean when EFB was applied at the rate equivalent to 3 kg N/rai. The suppression effect of N application as agro-waste on BNF was observed when the EFB was used at high dose as irrigated water.
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