Water productivity and soil chemical properties under varying water regimes on spring rice (Oryza sativa L.) in Hanoi, Vietnam

Issue Date

12-2008

Abstract

Decreasing water availability in rice production would require the need for higher water productivity, and one approach to deal with this challenge is through water-saving practices. Field experiments were conducted during 2007 spring season at Hanoi Agricultural University Experiment Station in Gialam District, Hanoi, Vietnam to quantify the effects of water-saving regimes on water productivity, soil chemical characteristics and crop yield in spring rice. The role of subsurface hydrology was also studied to assess the effects of water-saving practices on the water balance. Three moisture regimes were imposed: i) continuously flooded (CF) up to 5cm from soil surface; ii) alternate wetting and drying (AWD); and iii) irrigation until soil is saturated (SS). The AWD and SS with mid-season drainage did not lead to very dry soil conditions during the vegetative periods. Shallow ground water table remained within the root depth of the soil profile and soil water potentials were never below -10 kPa. Biomass and grain yields between AWD, SS and CF did not differ significantly. Water productivity was highest under SS (3.19 kg m³) followed by AWD (2.82 kg m³) and CF (2.55 kg m³). Maintaining field moisture near field capacity (SS) resulted in the highest grain yield and the least amount of irrigation water used. with reference to CF, the percentage of total water input saved from AWD was 6-14% and 10-17% for SS. On the other hand, the amount of irrigation water saved under AWD was 10-15% and 15-20% for SS. There were no significant differences in soil chemical characteristics under CF, AWD and SS water regimes.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463x

Volume

33

Issue

3

Page

56-70

Document Type

Article

Frequency

tri-quarterly

Physical Description

tables, graph,

Language

English

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