Productivity and water-use efficiency of rice (Oryza sativa) cultivars under different irrigation regimes and systems of cultivation Nayaka G.V. Venkataravana1,*, Reddy G. Prabhakara2, Kumar R. Mahender3, Surekha K.4, Sudhakar P.5 ICAR-Indian Institute of Rice Research, Hyderabad, Telangana500 030 1Assistant Professor, ICAR-Indian Institute of Rice Research, Hyderabad, Telangana500 030 2Principal Scientist and Head, Department of Agronomy, ICAR-Indian Institute of Rice Research, Hyderabad, Telangana500 030 3Principal Scientist and Head, Department of Soil Science, ICAR-Indian Institute of Rice Research, Hyderabad, Telangana500 030 4Associate Dean (Agronomy), Agricultural College, Mahanadi, Andhra Pradesh518 502 5Registrar (Incharge), Acharya N.G. Ranga Agricultural University, Lam Guntur, Andhra Pradesh522 034 *Corresponding author1s Email: venkat05iirr@gmail.com
Online published on 31 October, 2022. Abstract A field experiment was conducted on clay loam soils of the Indian Institute of Rice Research, Hyderabad, Telangana, during the rainy (kharif) seasons of 2017 and 2018, to study the performance of rice (Oryza sativa L.) cultivars under different irrigation regimes and systems of cultivation. The treatments consisted of 2 irrigation regimes, viz. alternate wetting and drying (AWD), and saturation as main plot treatments, while 3 systems of cultivation, viz. system of rice intensification (SRI), drum seeding (DS) and normal transplanting (NT) as subplot treatments and assessed 4 cultivars, viz. 1DRR Dhan 421, 1DRR Dhan 431, 1MTU 10101 and 1NLR 344491 as sub-subplot treatments. Total 24 treatment combinations were laid out in split-plot design with 3 replications. Application of water through the AWD method saved around 11–14% of the total water requirement during the crop-growth period. Irrigation by AWD resulted in significantly higher irrigation water productivity and water-use efficiency (WUE). The SRI method required the lowest amount of water (11.61% and 13.21% less of mean applied than drum seeding and normal transplanting respectively). Significantly higher water productivity and WUE were registered with SRI. 1DRR Dhan 431 recorded higher water productivity as well as WUE as compared to the other cultivars during both the years of study owing to higher productivity. Top Keywords Irrigation regimes, Relative water content, Systems of cultivation, Water Productivity, Water-use efficiency, Yield. Top |