Mineralization of Organic Residues, Dynamics of Microbial Biomass and Enzyme Activities in an Aridisol and Alfisol Soil under Rain-Fed Dry Farming

Rehmat Ullah (Department of Soil Science & Soil and Water Conservation, Pir Mehr Ali Shah, Arid Agriculture University, Rawalpindi)
Shehzada Munawar Mehdi (Directorate of Soil Fertility Survey & Testing Institute, Thokar Niaz Baig, Lahore)
Khalid Saif Ullah Khan (Department of Soil Science & Soil and Water Conservation, Pir Mehr Ali Shah, Arid Agriculture University, Rawalpindi)
Aftab Ahmed Sheikh (Directorate of Soil Fertility Survey & Testing Institute, Thokar Niaz Baig, Lahore, Pakistan)
Endang Sulistyowati (Department of Animal Science, Faculty of Agriculture, University of Bengkulu)
Muhammad Saud (Department of Sociology, Universitas Airlangga, Surabaya)

AGRITROPICA : Journal of Agricultural Sciences
Vol 1, No 1 (2018)

This study was planned with hypothesis to quantify mineralization rate of wheat and groundnut straw spiked in Kahuta and Guliana soil series. Results revealed that groundnut and wheat strawspiked soils had increased quantum of microbial biomass carbon (Cmic), biomass nitrogen (Nmic) and biomass phosphorous (Pmic) and activities of enzyme dehydrogenase (DHA) and alkaline phosphatase (APA) than un-amended soils. Initially, the contents of soil Cmic, Nmic, Pmic, DHA, and APA increased gradually during 2-14th days of incubation (DAI), again increased significantly at 28th DAI and then decreased slowly at 60th DAI in all treatments under both series. Hence, the addition of groundnut straw mineralized better than to other organic sources in both soil series.  These results suggested that groundnut straw must be incorporated in soil one month before sowing of crop to enhance crop yield under rain-fed dry farming.Key words: Crop Residues, Microbial Biomass, Soil Enzymes, Aridisol, Alfisols