Volume 7 | Issue - 1 articles in press
Volume 7 | Issue - 1 articles in press
Volume 7 | Issue - 1 articles in press
Volume 7 | Issue - 1 articles in press
Volume 7 | Issue - 1 articles in press
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.