Vol. 19 No. 2
Assessment of resistance and resilience of fluorescence in diacetate hydrolase activity under rice-wheat cropping system in an Inceptisol
Author(s): S. TRIPATHY, S. BISWAS, T. J. PURAKAYASTHA, N. AHMED, R. PANDEY, T. K. DAS AND B. RAMAKRISHNAN
Abstract: Concerned about the possible consequences of long-term climate change on resistance and resilience soil, this study was undertaken on a 11 years old long-term rice-wheat-mungbean cropping system based on conservation agriculture (CA) from ICAR-IARI, New Delhi. Collection of soil samples were done from 0-15cm depth and Fluorescein diacetate (FDA) hydrolase activity following heat stress of 48 °C for 24 hours and 3 days of air drying were examined in the soil samples on day 1,15,30 and 45 days after stress (DAS). FDA activity varied from 16.9 ìg fluorescein g-1 soil h- to 33.2 ìg fluorescein g-1 soil h-1. Activity of FDA was reduced significantly by heat and moisture stress. The recovery rate of enzyme activity ranged from 61% to 83% at 45 DAS. The triple zero tillage treatment with triple residue retention demonstrated the highest resilience and resistance to heat and moisture stress among all the zero tilled treatments. Resistance and resilience index had a strong agreement with equivalent rice yield. In the Indo-Gangetic plain, where rice and wheat are grown in a CA-based system, triple zero tillage with triple residue retention may be advised.
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