scholarly journals Topographic Position Influences Water Availability in Rainfed Lowland Rice at Rajshahi, Northwest Bangladesh

2004 ◽  
Vol 7 (1) ◽  
pp. 101-103 ◽  
Author(s):  
Benjamin Samson ◽  
Ansar Ali ◽  
Mohammed Rashid ◽  
Mohammed Mazid ◽  
Len Wade
Keyword(s):  
Water Availability ◽  
Lowland Rice ◽  
Topographic Position ◽  
Rainfed Lowland

Soil clay content, rainfall, and toposequence positions determining spatial variation in field water availability as estimated by a water balance model for rainfed lowland rice

2012 ◽  
Vol 63 (6) ◽  
pp. 529 ◽  
Author(s):  
T. Inthavong ◽  
M. Tsubo ◽  
S. Fukai
Keyword(s):  
Water Balance ◽  
Water Availability ◽  
Clay Content ◽  
Lowland Rice ◽  
Balance Model ◽  
Yield Reduction ◽  
Growing Period ◽  
Rainfed Lowland ◽  
Soil Clay ◽  
Soil Clay Content

Drought is a major limiting factor for the production of rainfed rice in the Mekong Region. Thus, estimation of the length of growing period (LGP) based on estimation of the development of water deficit is essential for sound planning of agricultural development. A recently developed soil-water balance model was used to quantify the availability of water for rice crops and yield reduction due to water deficit. Field water availability is known to be largely affected by soil type and rainfall pattern, and their separate effects were investigated in this study of a spatial analysis of LGP, using inputs for rainfed lowland rice in Savannakhet province in central Laos. The analysis showed that the start of growing period (SGP) and end of growing period (EGP) were affected largely by geographical variations in rainfall and soil clay content, respectively. Also, the areas having relatively short LGP were generally associated with large yield reduction because of low water availability associated with coarse-textured soils. At local scale, field water availability varied from upper to lower positions of a sloping land (toposequence) in the rainfed lowland ecosystem of the Mekong region, causing variation in yield within the toposequence. Using the level of field water determined around flowering time at different toposequence positions in 45 farms, estimated yield reduction was compared in seven main rice-growing districts of the province. Variability of yield loss, associated with variation in water availability, was larger across the toposequence positions than across districts, showing the importance of local variability in determining yield in rainfed lowland rice. The present approach of a combination of simulation model and GIS is adopted for characterisation of the water environment for rainfed lowland rice in other parts of Laos, as well as in neighbouring Thailand and Cambodia.

scholarly journals Genotypic Variation in Response of Rainfed Lowland Rice to Prolonged Drought and Rewatering

2004 ◽  
Vol 7 (4) ◽  
pp. 406-420 ◽  
Author(s):  
Akihiko Kamoshita ◽  
Reynaldo Rodriguez ◽  
Akira Yamauchi ◽  
Len Wade
Keyword(s):  
Genotypic Variation ◽  
Lowland Rice ◽  
Rainfed Lowland ◽  
Prolonged Drought

scholarly journals Performance of Rainfed Lowland Rice Genotypes under Different Levels of Boron Application

2017 ◽  
Vol 13 (1) ◽  
pp. 28-34
Author(s):  
Ram Kumar Shrestha ◽  
Sita Paudel ◽  
Samjhana Wagle ◽  
Salikram Ghimire ◽  
Deepak Yadav
Keyword(s):  
Lowland Rice ◽  
Rainfed Lowland ◽  
Rice Genotypes ◽  
Different Levels

scholarly journals Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying; Comparison of Two Lines

2009 ◽  
Vol 12 (1) ◽  
pp. 17-28 ◽  
Author(s):  
Joel DLC. Siopongco ◽  
Kazumi Sekiya ◽  
Akira Yamauchi ◽  
James Egdane ◽  
Abdelbagi Ismail ◽  
...  
Keyword(s):  
Lowland Rice ◽  
Soil Drying ◽  
Stomatal Responses ◽  
Rainfed Lowland
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