Wastewater from monosodium glutamate industry as a low cost fertilizer source for corn (Zea mays L.)

Nitrogen rich wastewater from monosodium glutamate industry (MSG) and paper-mill wastewater were used in this study as low cost fertilizers for growing corn, a common fuel crop. Detailed characterization of the wastewaters and toxicity testes were conducted to assure the safety of these wastewaters. In a greenhouse pot experiment, effects of these wastewaters on corn growth and biomass yield along with the soil properties were evaluated. MSG-wastewater was applied at three rates i.e., zero, 5 m3 ha−1 and 7.5 m3 ha−1 and paper-mill wastewater was applied at and zero, 3.5 m3 ha−1 and 5 m3 ha−1 in a complete randomized blocks design experiment. Significant increase in the corn biomass yield was observed in all the wastewater treatments compared to the Control. Both these wastewaters did not show any adverse effects on plant. N-use efficiency from the MSG-wastewater was comparable to urea-N application. This study emphasizes on sustainable practices for energy crop production by utilizing wastewaters as fertilizer sources. Hence, we report for the first time that the MSG-wastewater can be used for growing corn as a low cost green practice without adverse affects on the soil properties.

► MSG-wastewater acidity neutralization with highly alkaline paper-mill effluent is sustainable practice.
► Growing fuel crops using wastewaters comprises multiple benefits on plant, soil, and environment.
► Organic rich wastewaters improve SOC.
► Co-application of MSG and paper-mill wastewaters stimulates humification.