Profitable and energy-efficient rice (Oryza sativa)-based cropping systems in Northern Telangana of Andhra Pradesh

A field experiment was conducted at Regional Agricultural Research Station, Jagtial, during rainy (kharif) and winter (rabr) seasons of 1996-97 to 1998-99 on red sandy-loam soils, to find out profitable and energy-efficient rice (Oryza sativa L.)-based cropping sequences among different cropping sequences, viz., rice-maize (Zea mays L.), rice-sunflower (Helianthus annuus L.), rice-groundnut (Arachis hypogaea L.), rice-blackgram (Phaseolus mungo L.), rice-greengram (Phaseolus radiatus L.), rice-soybean [Glycine m a (L.) Merr.], rice-ln- dian mustard [Brassica juncea (L.) Czernj. & Cosson] and rice-rice. Of the 8 cropping sequences, rice-rice, rice- maize and rice-sunflower cropping sequences gave significantly higher rice-equivalent yield (1 1,616, 11,553 and 10,868 kg/ha respectively) and gross returns (Rs 51,745, 51,464 and 48,2911ha respectively). Though field water supply was higher to rice-rice cropping sequence (2,800 mm), the water-use efficiency was lowest (4.15 kg/mm). Similarly, rice-rice cropping sequence also required higher energy input (75,036 MJIha) but the energy efficiency and energy productivity were lowest (4.2 and 155 g1MJ). However, net returns and benefit : cost ratio were higher with rice-maize (Rs 21,8841ha; 1.74) and rice-sunflower (Rs 21,3211ha; 1.79) cropping sequences. Similarly, these cropping sequences also recorded higher energy-use efficiency (6.4 and 5.1 respectively), en- ergy productivity (227 and 238 g1MJ respectively) and water-use efficiency (7.22 and 7.50 kglmm respectively) and were more sustainable than rice-rice and other rice-based cropping sequences.