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Crop performance and water- and nitrogen-use efficiencies in dry-seeded rice in response to irrigation and fertilizer amounts in northwest India

By G. Mahajan, B. S. Chauhan, J. Timsina, P. P. Singh and K. Singh

Abstract

Because of increasing constraints of labor and water availability, dry-seeded rice (DSR) is now considered to be a new and emerging rice production system in the northwest Indo-Gangetic Plains of India. However, limited information is available on optimizing nutrient and water management in DSR to produce high yields. The effects of four amounts of N (0, 60, 120, and 180kgha -1) applied with or without P and K fertilizers under two irrigation regimes (10 and 20kPa; irrigated when soil water potential at 15-cm soil depth reached 10 and 20kPa, respectively) were studied on rice yield, and N- and water-use efficiencies. Grain yield with irrigation threshold increasing from 10 to 20kPa did not decrease with the application of P and K fertilizers at 120kgNha -1, leading to substantial savings in irrigation water. At the soil moisture potential of 20kPa, application of P and K fertilizers along with 120kgNha -1 resulted in a 14% increase in rice vis-à-vis when P and K fertilizers were not applied. However, this effect was not observed at the soil moisture potential of 10kPa. Applying P and K fertilizers along with N at 20kPa compared with 10kPa resulted in higher water- and N-use efficiencies. Water-use efficiency was significantly correlated with yield-contributing parameters when P and K were supplied along with N; whereas, without P and K application, water-use efficiency was not correlated with any yield-contributing parameters. It was concluded that, in DSR, the addition of P and K along with N could compensate for the yield loss under water-stress conditions. Our study suggests that there is a need to study the effects of applying different amounts of P and K along with N under a range of water regimes on dry matter partitioning and soil characteristics to understand the mechanism of yield loss in DSR

Topics: Fertilizers, Irrigation schedule, Nitrogen-use efficiency, Soil water potential, 1102 Agronomy and Crop Science, 1111 Soil Science
Publisher: 'Elsevier BV'
Year: 2012
DOI identifier: 10.1016/j.fcr.2012.04.011
OAI identifier: oai:espace.library.uq.edu.au:UQ:334411
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