Designing Resource-Efficient and Environmentally Safe Cropping Systems for Sustainable Energy Use and Economic Returns in Indo-Gangetic Plains, India

Achieving an economically feasible and environmentally robust model in agriculture while satisfying the expanding population's food demands is a global challenge. Hence, a three-year (2014-2017) study was conducted at Punjab Agricultural University, Ludhiana to design environmentally clean, energy-efficient, and profitable cropping systems. Twelve cropping systems viz., rice-wheat (CS1), basmati rice-hayola (transplanted)-mung bean (CS2), basmati rice-radish-maize (CS3), maize-potato-maize (CS4), maize + turmeric-barley + linseed (CS5), maize + turmeric-wheat + linseed (CS6), maize + radish-wheat + linseed-mung bean (CS7), groundnut + pigeon pea (5:1)-wheat + sarson (9:1) (CS8), maize + black gram-pea (bed) + celery (furrows) (CS9),(:) maize + pigeon pea-chickpea (bed) + gobhi sarson (furrows) (CS10), maize (green cobs) + vegetable cowpea + dhaincha (Sesbania spp.)-chickpea + gobhi sarson (CS11) and sorghum + cowpea (fodder)-wheat + gobhi sarson (9:1) (CS12) were tested in a four-times-replicated randomized block design. CS11 had the maximum system productivity (28.57 Mg ha(-1)), production efficiency (78.27 Kg Day(-1) ha(-1)), irrigation water use efficiency (2.38 kg m(-3)), system net returns (4413.3 US$ ha(-1)), and benefit to cost (B:C) ratio (2.83) over others. In comparison to the CS1 system, this cropping system required similar to 78% less irrigation water for a unit economic production. However, the cultivation of CS12 registered the highest energy use efficiency (49.06%), net energy returns (6.46 x 10(3) MJ ha(1)), and global warming potential (GWP) (Mg CO2 e ha(-1)) at spatial scale. Among all the intensified systems, CS11 had the lowest GHGI (0.29 kg CO2 e kg(-1)). Furthermore, cultivation of CS6 resulted in the maximum bacterial and actinomycetes population in the soil, while CS5 yielded the highest fungal count (23.8 x 10(3) cfu g(-1) dry soil) in soil. Our study suggests that the cultivation of CS11 is a resource-efficient, economically viable, and environmentally clean production system and could be a potential alternative to rice-wheat systems for developing a green economy policy for agricultural development in the Indo-Gangetic Plains (IGP) of India.

Automated summary

Achieving an economically feasible and environmentally robust model in agriculture while satisfying the expanding population's food demands is a global challenge. A three-year study conducted at Punjab Agricultural University aimed to design environmentally clean, energy-efficient, and profitable cropping systems. The cultivation of maize (green cobs) + vegetable cowpea + dhaincha was found to be a resource-efficient, economically viable, and environmentally clean production system.