Microbial Biomass Turnover in Indian Subtropical Soils under Different Sugarcane Intercropping Systems

Agronomy Journal - Tập 98 Số 3 - Trang 698-704 - 2006
Archna Suman1, Menhi Lal1, A. K. Singh1, Asha Gaur1
1Division of Crop Production Indian Inst. of Sugarcane Research Rae‐Barely Rd., P.O. Dilkusha Lucknow 226 002 UP India

Tóm tắt

Changes in soil organic C (Corg), total N (Nt), available nutrients, soil microbial biomass C (Cmic) and N (Nmic), and mineralizable C and N in the sugarcane (Saccharum officinarum L.) rhizosphere were evaluated under intensive sugarcane cropping systems with intercrops including wheat (Triticum aestivum L.), maize (Zea mays L.), rajmash (Phaseolus vulgaris L.), green gram [Vigna radiata (L.) R. Wilczek var. radiata], cowpea [Vign aunguiculata (L.) Walp.], lentil (Lens culinaris Medik.), mustard (Brassica rapa L.), potato (Solanum tuberosum L.), and sesbania (Sesbania rostrata Bremek. & Oberm.) in subtropical soils of India. Organic C increased significantly when maize (25%), wheat (24%), mustard (19%), potato (17%), and rajmash (13%) were intercropped with sugarcane, while legume intercrops substantially increased Nt and available N. Increase in microbial respiration was greater where maize (42%), wheat (37%), or mustard (31%) were intercropped compared with pulse crops. Soil microbial biomass C accounted for 2.7 to 3.3% of Corg content and Nmic accounted for 2.6 to 3.7% of Nt under different intercropping conditions. A higher CO2 evolution rate and wider Cmic/Nmic ratios were recorded with cereal and mustard intercrops, whereas higher N mineralization was recorded with pulse intercrops. Results indicate that intercropping with pulse crops and incorporation of their labile C substrate improved N mineralization. The build up of the C pool and Cmic in the case of cereals, mustard, and potato intercropping should promote long‐term stability.

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Agronomy Journal

Tập 98 Số 3

698-704

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