Abstract
Changes in tillage regime from conventional tillage to zero tillage (ZT) call for efficient weed and N management. Nitrogen is subject to immobilization/mineralization under residue-laden ZT system and increasing N-use efficiency through scheduling/rationalization of N is a researchable issue. The authors investigated the N and weed management options for wheat under ZT with or without residue. Results showed that ZT + residue retention (R) + 75% N + GreenSeeker™ (GS)-aided N management (ZT + R+75N + GS) recorded significantly higher wheat yield (5.11 t ha−1) over CT − R + 100N (4.48 t ha−1). The ZT + R+75N + GS improved macro-aggregates by 25.3% and decreased micro-aggregates by 6.8% in surface soil than CT − R + 100N. Treatment ZT + R+75N + GS had highest labile C (~ 3.63 g C kg−1 soil), which was 24.7% higher than CT − R + 100N (2.91 g C kg−1 soil). This treatment resulted in highest microbial biomass C (148.6 µg g−1 soil). It showed a significant increment in fluorescein diacetate (by 30.9%), total phosphatase (by 63.2%) and urease (by 31.6%) activities in surface soil over CT − R + 100N. Optical sensor-based N management saved N to the tune of 15–20 kg ha−1 over CT − R + 100 N. The ZT with residue retention and GS-aided N management has greater potential to secure sustainable yield, better soil aggregation, labile C and soil micro-flora than CT without/with residue incorporation.
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Acknowledgements
The authors gratefully acknowledge the support received from the different Divisions of the ICAR-Indian Agricultural Research Institute (ICAR-IARI), New Delhi for successful conduct of this research work during the Ph.D. programme. The financial support from ICAR-Indian Agricultural Research Institute and Department of Scientist and Technology (DST), Govt. of India is gratefully acknowledged. There is no conflict of interest regarding the manuscript findings.
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Conventional tillage deteriorated the soil health in the Indo-Gangetic Plains. Zero tillage with crop residue retention can restore soil health by enhancing soil physical and biological properties and carbon stock. Sequential herbicides for effective weed management and optical sensor-based nitrogen application can sustain yield.
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Nath, C.P., Das, T.K., Bhattacharyya, R. et al. Nitrogen Effects on Productivity and Soil Properties in Conventional and Zero Tilled Wheat with Different Residue Management. Proc. Natl. Acad. Sci., India, Sect. B Biol. Sci. 89, 123–135 (2019). https://doi.org/10.1007/s40011-017-0919-z
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DOI: https://doi.org/10.1007/s40011-017-0919-z