Hidetoshi Asai
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View article: Continuous farmyard manure application increases nitrogen fixation capacity of soils and relative abundance of iron-oxidizing diazotrophs in nutrient-deficient paddy fields in Madagascar
Continuous farmyard manure application increases nitrogen fixation capacity of soils and relative abundance of iron-oxidizing diazotrophs in nutrient-deficient paddy fields in Madagascar Open
Farmyard manure (FYM)-a mixture of animal excreta and plant residues-remains an important nutrient resource for lowland rice production in sub-Saharan Africa (SSA). However, the underlying mechanism of FYM in altering microbiological commu…
View article: Detection and characterization of quantitative trait loci for phytic acid in grains toward improved black rice in northern Laos
Detection and characterization of quantitative trait loci for phytic acid in grains toward improved black rice in northern Laos Open
Black rice is an essential agricultural commodity in the upland ecosystems of northern Laos. Considering the low yield potential of black rice and the low-fertility soils in the region, breeding improved black rice with high yield potentia…
View article: Optimizing phosphorus management to increase grain yield and nutritional quality while reducing phytic acid concentration in black rice (Oryza sativa L.)
Optimizing phosphorus management to increase grain yield and nutritional quality while reducing phytic acid concentration in black rice (Oryza sativa L.) Open
Rice with a black-colored pericarp (hereafter, black rice) has attracted considerable attention because of its high nutritional value. It is traditionally grown in infertile agroecosystems, where soil nutrient deficiency would affect grain…
View article: Influence of the beam-beam collisions on the energetic particle distribution in large helical device
Influence of the beam-beam collisions on the energetic particle distribution in large helical device Open
The influence of Coulomb collisions between energetic particles in a neutral beam injection (NBI)-heated plasma is numerically investigated utilizing the improved collision operator for the orbit-following type of Monte Carlo codes. This n…
View article: <i>MORE PANICLES 3</i>, a natural allele of <i>OsTB1/FC1</i>, impacts rice yield in paddy fields at elevated <scp>CO<sub>2</sub></scp> levels
<i>MORE PANICLES 3</i>, a natural allele of <i>OsTB1/FC1</i>, impacts rice yield in paddy fields at elevated <span>CO<sub>2</sub></span> levels Open
SUMMARY Improving crop yield potential through an enhanced response to rising atmospheric CO 2 levels is an effective strategy for sustainable crop production in the face of climate change. Large‐sized panicles (containing many spikelets p…
View article: Child requiring tracheostomy for removal of an airway foreign body at the tracheal bifurcation
Child requiring tracheostomy for removal of an airway foreign body at the tracheal bifurcation Open
Airway foreign bodies are typically removed orally using a rigid bronchoscope. We present a rare case of a foreign body at the tracheal bifurcation that required removal via tracheostomy. A child turned pale while eating nuts and was suspe…
View article: Replication Data for: Application of a Bayesian approach to quantify the impact of nitrogen fertilizer on upland rice yield in sub-Saharan Africa
Replication Data for: Application of a Bayesian approach to quantify the impact of nitrogen fertilizer on upland rice yield in sub-Saharan Africa Open
Mineral fertilizer input is indispensable to offset yield stagnation in rainfed upland rice production in sub-Saharan Africa (SSA). The present study is the first attempt to perform a meta-analysis based on a Bayesian approach with the obj…
View article: Soil phosphorus retention can predict responses of phosphorus uptake and yield of rice plants to P fertilizer application in flooded weathered soils in the central highlands of Madagascar
Soil phosphorus retention can predict responses of phosphorus uptake and yield of rice plants to P fertilizer application in flooded weathered soils in the central highlands of Madagascar Open
Efficient phosphorus (P) fertilizer management is highly required for resource-limited farmers to achieve higher yields in typical P-deficient farmlands in sub-Saharan Africa. Although soil P retention has been conventionally used to estim…
View article: Farmyard manure application increases spikelet fertility and grain yield of lowland rice on phosphorus-deficient and cool-climate conditions in Madagascar highlands
Farmyard manure application increases spikelet fertility and grain yield of lowland rice on phosphorus-deficient and cool-climate conditions in Madagascar highlands Open
Phosphorus (P) deficiency is a major yield constraint for lowland rice production in the tropics. As P-fertilizer resources are finite, alternative fertilizer management is needed for sustainable rice production. We examined whether farmya…
View article: Root Response to Soil Water Status via Interaction of Crop Genotype and Environment
Root Response to Soil Water Status via Interaction of Crop Genotype and Environment Open
Flooding and drought are major causes of reductions in crop productivity. Root distribution indicates crop adaptation to water stress. Therefore, we aimed to identify crop roots response based on root distribution under various soil condit…
View article: Discriminating crops/weeds in an upland rice field from UAV images with the SLIC-RF algorithm
Discriminating crops/weeds in an upland rice field from UAV images with the SLIC-RF algorithm Open
In this study, we propose a method for discriminating crops/weeds in upland rice fields using a commercial unmanned aerial vehicles (UAVs) and red-green-blue (RGB) cameras with the simple linear iterative clustering (SLIC) algorithm and ra…
View article: Effects of quantitative trait locus <i>MP3</i> on the number of panicles and rice productivity in nutrient‐poor soils of Madagascar
Effects of quantitative trait locus <i>MP3</i> on the number of panicles and rice productivity in nutrient‐poor soils of Madagascar Open
The majority of paddy fields in sub‐Saharan Africa (SSA) are characterized by nutrient‐poor soils. In such fields, tillering in rice ( Oryza sativa L.) plants is severely restricted, which results in a reduced number of panicles and thus a…
View article: Exploring relevant wavelength regions for estimating soil total carbon contents of rice fields in Madagascar from Vis-NIR spectra with sequential application of backward interval PLS
Exploring relevant wavelength regions for estimating soil total carbon contents of rice fields in Madagascar from Vis-NIR spectra with sequential application of backward interval PLS Open
Laboratory visible and near-infrared (Vis-NIR) spectroscopy with partial least squares (PLS) regression can be used to determine the soil carbon (C) content, and the waveband selection procedures can refine the predictive ability. However,…
View article: Field phenotyping of plant height in an upland rice field in Laos using low-cost small unmanned aerial vehicles (UAVs)
Field phenotyping of plant height in an upland rice field in Laos using low-cost small unmanned aerial vehicles (UAVs) Open
Plant height (PH) is an important agronomical parameter to assess the growth status in upland rice fields. Recently, field-based phenotyping using unmanned aerial vehicles (UAVs) has received increasing attention as a cost-effective, well-…
View article: Identifying key traits in high-yielding rice cultivars for adaptability to both temperate and tropical environments
Identifying key traits in high-yielding rice cultivars for adaptability to both temperate and tropical environments Open
Increasing rice yield potential is a continuous challenge posed by world population growth. To increase yield potential, favorable alleles of valuable genes need to be accumulated in promising germplasm. We conducted comparative yield tria…
View article: Laboratory Visible and Near-Infrared Spectroscopy with Genetic Algorithm-Based Partial Least Squares Regression for Assessing the Soil Phosphorus Content of Upland and Lowland Rice Fields in Madagascar
Laboratory Visible and Near-Infrared Spectroscopy with Genetic Algorithm-Based Partial Least Squares Regression for Assessing the Soil Phosphorus Content of Upland and Lowland Rice Fields in Madagascar Open
As a laboratory proximal sensing technique, the capability of visible and near-infrared (Vis-NIR) diffused reflectance spectroscopy with partial least squares (PLS) regression to determine soil properties has previously been demonstrated. …
View article: The Relationship between the Physical Quality of Rice and the Market Price: A Case Study in Savannakhet, Laos, Using a Bayesian Approach
The Relationship between the Physical Quality of Rice and the Market Price: A Case Study in Savannakhet, Laos, Using a Bayesian Approach Open
The visual characteristics of rice grains play a primary role in determining the market price, and are used for grading systems in many rice-consuming countries. Laos is a rice-consuming country in Southeast Asia, but it does not have a fu…
View article: Progress in varietal improvement for increasing upland rice productivity in the tropics
Progress in varietal improvement for increasing upland rice productivity in the tropics Open
Enhancing rice yield in upland rice systems through genetic improvement remains a major challenge in the tropics. This review aims to provide the trends on upland rice cultivation over the last 30 years and recent distribution of upland ri…
View article: Vis-NIR Spectroscopy and PLS Regression with Waveband Selection for Estimating the Total C and N of Paddy Soils in Madagascar
Vis-NIR Spectroscopy and PLS Regression with Waveband Selection for Estimating the Total C and N of Paddy Soils in Madagascar Open
Visible and near-infrared (Vis-NIR) diffuse reflectance spectroscopy with partial least squares (PLS) regression is a quick, cost-effective, and promising technology for predicting soil properties. The advantage of PLS regression is that a…
View article: Yield Performance of Upland Rice, Maize and Job’s Tears in a Rainfed Upland Ecosystem in Mountainous Laos
Yield Performance of Upland Rice, Maize and Job’s Tears in a Rainfed Upland Ecosystem in Mountainous Laos Open
Adaptability to a wide range of environmental factors is a key for achieving stable production in the slash-and-burn (S&B) agriculture of mountainous Laos, where soil varies widely in productivity.Adaptability assessment based on the genot…
View article: Drought-induced root plasticity of two upland NERICA varieties under conditions with contrasting soil depth characteristics
Drought-induced root plasticity of two upland NERICA varieties under conditions with contrasting soil depth characteristics Open
To identify differences in root plasticity patterns of two upland New Rice for Africa (NERICA) varieties, NERICA 1 and 4, in response to drought under conditions with contrasting soil profile characteristics, soil moisture gradients were i…
View article: The clinical consideration of 62 cases of acute epiglottitis that occurred in the emergency medical service center
The clinical consideration of 62 cases of acute epiglottitis that occurred in the emergency medical service center Open
急性喉頭蓋炎は，気道閉塞の危険がある救急疾患であり，救急現場では，緊急気道確保の要否の判断が求められる。しかし気道確保の適応基準は，未だ明らかではない。今回，気道確保を要する急性喉頭蓋炎の臨床像を明確化するため，当院に入院した急性喉頭蓋炎患者について後方視的観察研究を行った。62例を調査し，気道確保は10例（16.1％），その中で外科的気道確保は6例（9.7％）あり，症状出現から48時間以内に救急外来で施行された。気道確保群は非気道確保群と比較し，単変量解析にて，喫煙歴，喉…