Structural stability under different organic fertilizers management in paddy soil

Abstract

Abstract : The present study was conducted to determine the effects of organic carbon on soil structural stability and establish a correlation between soil aggregates with carbon (C) sequestration and different ratios of basic cations. Five treatments viz. control, cowdung, vermicompost, rice straw and poultry manure were laid out in a randomized complete block design in Boro rice cultivation where organic materials were applied considering 21C ha-1 except the control. The data revealed that different organic amendments insignificantly influenced soil carbon sequestration and water stable soil aggregates. However, a positive effect was found on C enhancement of soil with vermicompost and poultry manure treatments. Nonetheless, a positive relationship between total stable soil aggregates and C sequestration at crop harvest was also noticed. Improvement in soil aggregates followed the order of rice straw>poultry manure>vermicompost>cowdung treatments. Monovalent cationic ratios and cationic ratios on structural stability of soil significantly increased the stable soil aggregates of 0.25 mm sized particles at crop harvest.