Benjamin K. Samson

Benjamin K. Samson
International Rice Research Institute | IRRI · Crop and Environmental Sciences Division

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8
Publications
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Publications

Publications (8)
Article
Traditional tropical japonica genotypes (Oryza sativa) are typically grown without fertilizer for subsistence in slash-and-burn systems by resource-poor farmers in northern Laos. Recent short fallows have reduced soil fertility and rice productivity in these systems. Genotypes adapted to a range of soil fertility conditions are needed for their foo...
Article
The objective of this study was to investigate the effect of biochar application (CA) on soil physical properties and grain yields of upland rice (Oryza sativa L.) in northern Laos. During the 2007 wet season, three different experiments were conducted under upland conditions at 10 sites, combining variations in CA amounts (0–16 t ha−1), fertilizer...
Article
In rainfed lowland rice fields, developing hardpan soil layers must be important to pool rainfall, but during drought that also restricts water movement from below it. We investigated whether the hardpan can maintain a contrast of deuterium/hydrogen isotopic composition (δD) in soil water under field condition. The experimental site was at Rajshahi...
Article
Rice roots are commonly shallow in rainfed lowland conditions. Mechanical impedance is one factor that may restrict access of roots to deeper soil layers, thereby reducing the capacity of the root system to extract water from depth during late-season drought. The capacity of rice roots to penetrate hardpans was examined in experiments at Rajshahi,...
Article
The physical environment of the rainfed lowland ecosystem is often characterised and grouped according to the surface hydrology of rice paddies and rice cultivars have been developed for each subecosystem. Rainfall is an important determinant of the yield of rainfed lowland rice, but other factors such as topography and soil fertility also affect g...
Article
Identification of specific physiological differences between maize hybrids tolerant and susceptible to drought would be useful to plant breeders for improving selection criteria. One approach to identifying physiological differences is to compare cultivars differing in response to water-deficits. In this study, three field experiments focused on ve...
Article
Detailed knowledge of the distribution of roots in the soil is important in understanding the extraction of water and nutrients from soil. Various techniques have been developed to monitor root-length density under field conditions. Excavation techniques, including soil cores, have long been considered to give reliable estimates of root-length dens...

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