ISSN : 2663-2187

Evaluating the effect of neem cake and urea to enhance the nitrogen content during food waste composting

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Thankaraj Anishla, Ammaiyappan Selvam, Jonathan W.C. Wong
» doi: 10.33472/AFJBS.6.Si3.2024.352-364

Abstract

Low nutrient content, especially nitrogen, often reduces the market value of the compost products. This study aimed at composting food waste (FW) with neem cake (NC) as co-substrate and urea (UR) to achieve a high-nutrient compost. The food waste and sawdust mixed at 1:1 ratio (on a dry basis) were mixed with 30% of NC and this mix was added with urea at 1.5% and 3% individually, while the FW and FW+NC served as controls to evaluate the influence of NC and added urea, respectively. The substrates were composted in 20-L in-vessel composters with aeration for 42 days. Addition of 30% NC resulted in a decrease in the EC from 2.60 mS/cm to 2.25 mS/cm. Total Kjeldahl nitrogen (TKN) content gradually decreased at the beginning of the composting and gradually increased thereafter. The TKN contents were 2.33 ± 0.17% in FW+NC30, 2.84 ± 0.50% in FW+NC30+UR1.5, 3.11± 0.30% in FW+NC30+UR3 and 1.89±0.01% in control treatments. The results indicate addition of 3% urea showed maximum N content; however, the compost products exerted phytotoxicity as evidenced from the very low seed germination index. Addition of 1.5% urea alongwith 30% neem cake is recommended to increase the nitrogen content of the food waste compost.

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