Nutrient Release and Fungal Succession during Decomposition of Crop Residues in a Shifting Cultivation System
2010
Majumder, M. | Shukla, A.K. | Arunachalam, A.
Litter decomposition and nutrient-release patterns of three dominant crop species were studied in a jhum cultivation system in the humid tropics of northeast India. Crop residues showed an exponential weight-loss pattern with time. The release of nitrogen (N), phosphorus (P), and potassium (K) followed a similar pattern with weight loss, and their mineralization constants were 3.46-20.47, 2.25-18.41, and 3.82-24.70, respectively. The microbial population and fungal diversity in the decomposing litter varied with incubation time and depended mainly on the litter nutrient concentrations. Overall, the foliage residues of Capsicum frutescens and Eleusine coracana with carbon (C)/N < 25 are of good quality, and they decomposed (t99 = 122 and 333 days, respectively) fastest and released 99% of their nutrients (C, N, and K) between 74 and 263 days of incubation. Thus, all the foliage residues, particularly those of Capsicum frutescens and Eleusine coracana, can play a significant role for soil nutrient enrichment in poorly managed jhum cultivation system.
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