Field water management to save water and increase its productivity in irrigated lowland rice

被引:901
作者
Bouman, BAM [1 ]
Tuong, TP [1 ]
机构
[1] Int Rice Res Inst, Soil & Water Sci Div, Makati City 1271, Philippines
关键词
rice; irrigation; water saving; water productivity;
D O I
10.1016/S0378-3774(00)00128-1
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Rice production in Asia needs to increase to feed a growing population whereas water for irrigation is getting scarcer. Major challenges are to (i) save water; (ii) increase water productivity and (iii) produce more rice with less water. This study analyzes the ways in which water-saving irrigation can help to meet these challenges at the field level. The analyses are conducted using experimental data collected mostly in central-northern India and the Philippines. Water input can be reduced by reducing ponded water depths to soil saturation or by alternate wetting/drying. Water savings under saturated soil conditions were on average 23% (+/- 14%) with yield reductions of only 6% (+/-6%). Yields were reduced by 10-40% when soil water potentials in the root zone were allowed to reach -100 to -300 mbar. In clayey soils, intermittent drying may lead to shrinkage and cracking, thereby risking increased soil water loss, increased water requirements and decreased water productivity. Water productivity in continuous flooded rice was typically 0.2-0.4 g grain per kg water in India and 0.3-1.1 g grain per kg water in the Philippines. Water-saving irrigation increases water productivity, up to a maximum of about 1.9 g grain per kg water, but decreases yield. It therefore does not produce more rice with less water on the same field. Field-level water productivity and yield can only be increased concomitantly by improving total factor productivity or by raising the yield potential. Total rice production san be increased by using water saved in one location to irrigate new land in another. IF this is not dent, a strategy of saving water at the field level potentially threatens total rice production at large. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:11 / 30
页数:20
相关论文
共 34 条
  • [1] Rice crop growth and yield as influenced by changes in ponding water depth, water regime and fertigation level
    Anbumozhi, V
    Yamaji, E
    Tabuchi, T
    [J]. AGRICULTURAL WATER MANAGEMENT, 1998, 37 (03) : 241 - 253
  • [2] [Anonymous], 1993, WATER CRISIS GUIDE W
  • [3] Bhuiyan S. I., 1995, CONSTRAINTS OPPORTUN, P143
  • [4] BHUIYAN SI, 1995, IRRIGATION SCI, V16, P1, DOI 10.1007/BF00208389
  • [5] Datta S. K. de, 1973, Water management in Philippine irrigation systems: research and operations., P1
  • [6] Datta S. K. de, 1973, Water management in Philippine irrigation systems: research and operations., P19
  • [7] DE DATTA S.K., 1981, PRINCIPLES PRACTICES
  • [8] DEDATTA SK, 1968, P PAP 4 SEM EC SOC S, P78
  • [9] RESOURCE USE EFFICIENCY IN AGRICULTURE
    DEWIT, CT
    [J]. AGRICULTURAL SYSTEMS, 1992, 40 (1-3) : 125 - 151
  • [10] SELECTION FOR REPRODUCTIVE STAGE DROUGHT AVOIDANCE IN RICE, USING INFRARED THERMOMETRY
    GARRITY, DP
    OTOOLE, JC
    [J]. AGRONOMY JOURNAL, 1995, 87 (04) : 773 - 779