摘要
The study on energy-use efficiency and economics of soybean based cropping system, viz., soybean–wheat (Glycine max 9 L., Triticum aestivum L. emend. Fiori & Paol.), soybean–lentil (Lens culinaris Medicus) and soybean–field pea (Pisum sativum L., sensu lato), was carried out at the Hawalbagh experimental farm of Vivekananda Institute of Hill Agriculture, Almora, Uttarakhand, India during 2001–2003 (29°36′ N, 79°40′ E). These cropping systems, under rainfed conditions, were evaluated with different tillage management practices, viz., zero tillage (ZT), minimum tillage (MT) and conventional tillage (CT). Each tillage management practice, under each cropping system was evaluated for total energy output, energy input–output ratio, gross income, net income and marginal income, to variable cost of cultivation. Results revealed that the maximum energy was consumed in terms of chemical fertilizers, followed by seed and plant protection chemicals, in all cropping systems. Equivalent energy was used from literature for conversion purpose. The maximum output energy was observed in CT (44,253 MJ/ha), followed by MT for soybean–lentil cropping system (43,450 MJ/ha). The output–input energy ratio was maximum in ZT for soybean–lentil (4.9) followed by MT for soybean–pea cropping system (4.6). The economic analysis also revealed that the maximum benefits could be obtained from these sequences. Conventional tillage for all cropping sequences was found to be a better option as compared to minimum tillage and zero tillage. Benefit–cost ratios were higher in conventional tillage in all the three cropping systems. However, from the point of energy saving or cost reduction, zero tillage and minimum tillage may be considered depending on resources.