期刊
FIELD CROPS RESEARCH
卷 134, 期 -, 页码 59-70出版社
ELSEVIER
DOI: 10.1016/j.fcr.2012.04.011
关键词
Fertilizers; Irrigation schedule; Nitrogen-use efficiency; Soil water potential
类别
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 180 kg ha(-1)) applied with or without P and K fertilizers under two irrigation regimes (10 and 20 kPa: irrigated when soil water potential at 15-cm soil depth reached 10 and 20 kPa, respectively) were studied on rice yield, and N- and water-use efficiencies. Grain yield with irrigation threshold increasing from 10 to 20 kPa did not decrease with the application of P and K fertilizers at 120 kg N ha(-1), leading to substantial savings in irrigation water. At the soil moisture potential of 20 kPa, application of P and K fertilizers along with 120 kg N ha(-1) resulted in a 14% increase in rice vis-a-vis when P and K fertilizers were not applied. However, this effect was not observed at the soil moisture potential of 10 kPa. Applying P and K fertilizers along with N at 20 kPa compared with 10 kPa 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. (C) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据