Spatial variations in water availability, soil fertility and grain yield in rainfed lowland rice: A case study from Savannakhet province, Lao PDR

Inthavong, Thavone, Fukai, Shu and Tsubo, Mitsuru (2011) Spatial variations in water availability, soil fertility and grain yield in rainfed lowland rice: A case study from Savannakhet province, Lao PDR. Plant Production Science, 14 2: 184-195. doi:10.1626/pps.14.184

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Author Inthavong, Thavone
Fukai, Shu
Tsubo, Mitsuru
Title Spatial variations in water availability, soil fertility and grain yield in rainfed lowland rice: A case study from Savannakhet province, Lao PDR
Journal name Plant Production Science   Check publisher's open access policy
ISSN 1343-943X
1349-1008
Publication date 2011-04
Sub-type Article (original research)
DOI 10.1626/pps.14.184
Open Access Status DOI
Volume 14
Issue 2
Start page 184
End page 195
Total pages 12
Place of publication Sendai, Japan
Publisher Crop Science Society of Japan
Collection year 2012
Language eng
Abstract Rice is the single most important food crop in Laos. Savannakhet province, the largest area of rainfed lowland rice of any single province in the country was selected for the present case study to quantify the spatial distribution of two major limiting factors, water availability and soil fertility, and rice productivity in rainfed lowlands. Field water availability, fertilizer application and other crop management practices, and grain yield information were collected from over 100 farmers to provide basic information relating to rainfed lowland rice productivity and potential bio-physical constraints in this province over two rice cropping seasons. Poor soil fertility is identified as a major yield constraint with yield responding strongly to fertilizer application rate. The results also show that rainfall distribution pattern, soil type and position of rice fields on a sloping land, affect paddy water availability, and this in turn influences sowing time and is also expected to have effect on grain yield. To improve the productivity of rainfed lowland rice, combination of appropriate crop phenology, increased fertilizer use that is matched with water availability, and an understanding of soil water condition for the rice growing environment, is required. In a long term increasing soil fertility is required, and a significant improvement in rice productivity cannot be achieved by improved water availability alone, in a situation where the majority of paddy soils have low levels of fertility.
Keyword Drought
Grain yield
Oryza sativa
Soil nutrient
Toposequence
Water level
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Agriculture and Food Sciences
Queensland Alliance for Agriculture and Food Innovation
 
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Citation counts: TR Web of Science Citation Count  Cited 14 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 14 times in Scopus Article | Citations
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Created: Thu, 22 Mar 2012, 15:27:12 EST by Professor Shu Fukai on behalf of Qld Alliance for Agriculture and Food Innovation