Abstract
This study evaluated effects of integrated application of compost and secondary treated sewage effluent (STSE) on net N mineralization (NMnet) and ryegrass production. Soil incubation and pot (glasshouse) trials were carried out on two soil types, sandy loam and clay loam. NMnet was significantly higher (p < 0.05) in clay loam than in sandy loam soil. Increasing contribution of compost in integrated compost and STSE resulted in N immobilization. Experimental data on ryegrass dry matter (DM) obtained in pot trial was consistent with NMnet trend observed in soil incubation. In pot trial, ryegrass DM yield and N use efficiency reduced with increasing contribution of N from compost. For every unit addition of compost (25%), DM yield of ryegrass declined by 573 and 462 kg DM−1 in sandy loam and clay loam, respectively.
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