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Kumar, Anil; Choudhary, Anil K.
The Science of the total environment, 11/2023, Letnik: 899Journal Article
Conventional farming practices are energy and carbon-intensive. Low-cost technologies like AM-fungi (AMF) and precision P-management vis-à-vis precision irrigation-scheduling may enhance P-bioavailability, and crop- and water-productivity with reduced energy and carbon-footprints in acid-Alfisol of north-western Himalayas. Hence, an experiment was done in okra (Abelmoschus esculentus)-pea (Pisum sativum) cropping system (OPCS) using AMF (Glomus mosseae) at three inorganic-P levels (50, 75 & 100 % of soil-test based P-dose) and two irrigation-regimes (40 & 80 % AWC). AMF-inoculation significantly enhanced the system-productivity (∼11 %), bio-energy output (∼8 %) and SOC-storage over non-AMF plots in OPCS. Carbon-input use followed the trend of water>diesel>fertilizers> FYM > herbicides> pesticides>AMF in OPCS. AMF-inoculation significantly reduced the carbon-footprints (0.466 kg CO2-e kg−1) by ∼10.2 % over non-AMF plots. Soil-test based 100 % P-dose significantly enhanced the system-productivity (6.3–15.6 %) and bio-energy output (4.7–12.6 %) with lesser carbon-footprints (5.3–15 %) over 50 and 75 % P-dose. Irrigation at 80 % AWC enhanced system-productivity (∼4.1 %), however at 40 % AWC reduced carbon-footprints by ∼11.7 % besides saving irrigation-water by ∼24 % (150 mm ha−1/year) in OPCS. Hence, farmers must necessarily use AMF-inoculation coupled with soil-test based P-fertilization (75–100 %) while preserving a balance in irrigation water-use at 40–80 % AWC depending upon water-availability for higher crop- and water-productivity besides lesser energy and carbon-footprints in OPCS in Himalayan acid Alfisol. Display omitted •Higher yield (∼11 %) and energy output (∼8 %) in AMF-inoculated plots in Himalayan acid Alfisol.•AMF enhanced energy and carbon-productivity with ∼10.2 % lesser carbon-footprints (CFs).•100 % soil-test based P-dose enhanced system-productivity (6.3–15.6 %) and bio-energy (4.7–12.6 %) with least CFs (5.3–15 %).•Irrigation at 80 % AWC enhanced system-productivity (∼4.1 %) while irrigation at 40 % AWC reduced CFs by ∼11.7 % besides saving irrigation water by ∼24 % in OPCS.
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