Takanori Nagano

• Dr. (Agr.)
• Professor (Associate) at Kobe University

Irrigation is a key factor in plant production systems.

Carbon’s regulatory role in life dynamics has been acknowledged over the past 20 years all over the world. Humans, on the other hand, have known for thousands of years, albeit not conceptually, the impact of carbon in life on the quality of the soil necessary for the production of food, clothing, and shelter materials, and have attempted to maintai...

“Yamakiya School” is a community empowerment activity which started in 2016 in the Yamakiya district, Kawamata, Fukushima Prefecture, after the districtʼs evacuation order for the Fukushima nuclear disaster had been lifted. It mostly involves farming activities and included learning radiology in the beginning. This study was conducted to clarify th...

This study was carried out to determine the distribution and variability of soil salinity at the recently irrigated margins of the Akyatan lagoon and saline wetlands located in the Lower Seyhan basin in Adana, the eastern Mediterranean region of Turkey. An EM38-DD field apparatus was used to measure the apparent electrical conductivity of the soil...

Organic carbon in soil represents plant, animal and microbial origin materials associated with mineral fractions in different phases of stabilization and decomposition. Following the combatting of desertification that lasted for almost 60 years in Karapınar District located in the Konya Closed Basin of central Turkey, this study was conducted to mo...

Aims: The primary objective of this study was to figure out spatio-temporal tendencies of climate-types in Şanlıurfa town and its environs, located in the Southeastern Anatolia Project (GAP) area, through using Erinç Drought Index method. Methods and Results: Data sets consisting of long-term (1965-2018) annual total precipitation as well as aver...

Climate-types are subject to change spatially and temporally due to both the inherent variability of climate in itself and anthropogenic interventions to the environment. The primary objective of this study was to figure out spatio-temporal tendencies of climate-types in Şanlıurfa town and its environs, located in the Southeastern Anatolia Project...

This study quantitatively assesses the impacts of climate change on the irrigated agriculture of the Lower Seyhan Irrigation Project (LSIP) area in Turkey in the 2070s by factoring the projected future climate data into computational simulations of crop growth and the hydrological structure. According to simulation results by models registered to C...

Under climate change, the role of water management organisations is becoming critical for mitigating future water scarcity in Arid Regions. During the last couple of decades, many government-managed water allocation schemes were transferred to private organisations such as water users’ associations (WUAs). The transfer of the water management autho...

Climate change, including changes in air temperature and precipitation, would affect the basin hydrological regime, and the change in the hydrological system might have some impacts on agriculture. To assess the impacts of climate change on the hydrology and agriculture of a basin, the relationship between climate and basin hydrology, and between h...

In this study, a new grid-based optimization model was developed by transforming the research area into matrices with the help of gridding. The objective function of the optimization procedure was to minimize the penalty point or penalty function (PF), i.e., PF=mean (M)+standard deviation (STD), which was determined as the loss of information in gr...

Irrigation is a key factor in plant production systems. However, excessive and inappropriate water and soil management systems can cause significant environmental problems. The GAP (the Southeastern Anatolia Project, SEAP) is a multisectoral integrated regional development project. It aims to improve the economical and social welfare of the region...

It is worthwhile to classify paddy fields based on the long-term frequency of ponding, which strongly determines the yield of rice. However, over a wide area, the direct measurement of the frequency requires a large number of backscatter images from synthetic aperture radar (SAR). Another approach is the indirect estimation of the relative frequenc...

Nitrogen (N) is one of the major plant nutrients, excessively used in crop production, mainly as inorganic fertilizers. Fertilizer N is either taken up by the plant or lost by leaching, volatilization and immobilization; considerable amount is also subject to remain in soil in the forms of nitrate (N03) and ammonium (NH4). The research was carrie...

Soil salinization is inherently inevitable phenomenon in the irrigated agriculture. Accordingly, it is considered as the major environmental problem that affects the crop yield and consequently the socio-economic situation of the farming community. However, conventional soil salinity monitoring is not an easy task in large scale irrigation projec...

Özet Bu çalışma; 21 470.3 km² genişliğindeki Seyhan Havzasında yürütülmüştür. Çalışma kapsamında; Normalin Yüzdesi İndeksi (NYİ) yöntemi kullanılarak olasılıklı bölgesel meteorolojik kuraklık analizinin yapılması, şiddetli kurak (acil durum), normal ve üzeri (kuraklık riski olmayan) eşik yağış değerlerinin istasyon bazında %50 olasılıklı yağış e...

We developed an improved method to detect rice cultivated areas in semi-arid regions by combining the usage of Landsat imagery for detecting rice fields and MODIS for spatial and temporal upscaling of rice cultivation areas. We selected Haryana State in northwestern India as a case study area, where average farm plot size is small (~4,000 m2) and c...

Global warming is likely to exacerbate future fluvial floods in the world's mega-delta regions due to both changing climate and rising sea levels. However, the effects of sea level rise (SLR) on fluvial floods in such regions have not been taken into account in current global assessments of future flood risk, due to the difficulties in modeling cha...

This study was carried out in Akarsu Irrigation District, located in East Mediterranean Turkey. To find out sources of shallow water table and to quantify contribution of leakage from the canals in the irrigation district, oxygen, hydrogen and strontium isotopes were analyzed for the water samples collected from 108 drainage observation wells (dept...

In the Vietnamese Mekong Delta (VMD), water levels at some stations have increased. However, the factors that cause this rise in the VMD have not been identified. We considered four factors that may have contributed to the water level rise: (1) increased runoff from upstream, (2) sea-level rise, (3) land subsidence, and (4) decrease in flood mitiga...

Time-series vegetation and water indices derived from remote sensing images are crucial materials for farmland analysis based on crop phenology and monitoring such as classification of cropping patterns and monitoring of crop growth and productivities. However, the optical remote-sensing images often contain problematic pixels, such as those affect...

Irrigation is crucial to improve food security. Irrigated agriculture uses 70 percent of water withdrawn from surface and ground-water resources worldwide. Therefore, irrigation needs managing carefully both to save substantial amount of water for competing demands of other sectors and to avoid on-site and off-site environmental damage, which is al...

Different types of models are used to simulate experimental conditions of agricultural catchments in which researchers can directly measure impacts of agricultural practices such as irrigation, fertilization etc. on the aquatic environments. Although direct measurement of outcomes under controlled conditions will always be more reliable than modell...

The 9th World Congress of the European Water Resources Association is held in Istanbul (June 2015) following a unanimous decision of the General Assembly during the EWRA Conference in Porto (June 2013). This selection, among others, shows the firm determination of European scientists to spread the European principles and approaches in Water Resourc...

Fertilization and irrigation both are playing an increasingly major role in productivity of the common crops in the Mediterranean countries. Their importance is even more recognized in the recent years because of the global warming and water scarcity. However, irrigation together with nitrogen (N) fertilization induces nitrate (NO3) losses to groun...

The Chao Phraya delta in Thailand is a major rice production area. It is often subject to large flooding events, which may result in widespread crop failures, as most recently recorded in 2011 and 2006. The extent of flood damage in such areas is commonly assessed by field surveys. In this study, we investigate the spatial extent of flood damage to...

The firing temperature and production technology together with the provenance and source materials of a group of the Domuztepe (Cilicia, Turkey) Late-Hittite ceramics were studied by mineralogical analyses. The mineralogical (presence of basaltic minerals and the formation of forsterite and tridymite as high temperature minerals) results revealed t...

Synthetic aperture radar (SAR) backscatter amplitude image data have proven useful in estimating soil moisture levels and in approximating areas of water inundation over large regions. Based on the pattern of seasonal change in the backscatter coefficient at each image pixel, this study classified a variety of crop fields in Northeast Thailand acco...

抄録 Today enterprises which begin to participate in agriculture are increasing in number. In agricultural communities which permit their participation, there are mixtures of hopes and concerns about their roles. Enterprises need to establish both economical success and collaborative partnership with host communities for their sustainable management....

Reclamation studies against human-induced desertification should be maintained for a long time as the recovery of natural resources in arid and semi-arid environments asks for decades of conservation. This period is longer at sand dunes due to textural disadvantageous for providing plant nutrients, development of aggregates, structure and being ver...

West African Sahel relies much of its food production on rain-fed pearl millet cultivation (Pennisetum glaucum (L.) R. Br.). Its productivity is physically constrained by irregular rainfall and the inherent poor nutrient holding capacity of the soil. Extensive and deprival nature of its agriculture was sustained by migrant and semi-nomadic lifestyl...

Plant communities associated with the agricultural landscape are gradually getting impoverished and even eradicated and replaced by poor species in many places of the world. A large number of studies are now available about the interactions between root and the soil system. However, influence of plants on aggregate stability remains to be a complex...

Seasonal changes in the impacts of fertilizer on the composition of agricultural drainage water were examined by analyzing the (87)Sr/(86)Sr isotope ratio and chemical composition of drainage water samples. Samples of drainage water were taken from the main drainage canals of the Lower Seyhan Irrigation Project, at sites designated as D10, D11, and...

The aim of this research was to establishment an approach for the assessment of soil salinity dynamics in agricultural regions at the Eastern Mediterranean region of Turkey using CHRIS PROBA sensor imageries and indicator crops spectral characteristics. Three images were recorded on 26 May, 15 July and 3 December 2008 representing various stages of...

The management of drainage water from irrigated lands is an important issue not only for agricultural planning but also for environmental conservation. In arid and semi-arid regions, drainage water is reused as irrigation water due to lack of enough fresh irrigation water and irrigation schemes. The drainage water reuse should be undertaken only if...

We developed an approach to simulate flood and drought risks under present and future climate with both present and alternative reservoir rules. MRI-CGCM2 and CCSR/NIES/FRCGS-MIROC were dynamically downscaled to the Seyhan River Basin in Turkey. The data covered two 10-year time slices corresponding to the present (1990s) and future (2070s). Hydrol...

We explored the potential impacts of climate change on the hydrology and water resources of the Seyhan River Basin in Turkey. A dynamical downscaling method, referred to as the pseudo global warming method (PGWM), was used to connect the outputs of general circulation models (GCMs) and river basin hydrologic models. The GCMs used in this study were...

The Fertile Crescent of the Middle East region, embracing Syria, eastern Turkey and Iraq, marks the region where settled agriculture began, and where the landscape has been shaped for millennia by human activities. The lacustrine and fluvial terraces of the Late Pleistocene and Holocene Eras are common geomorphic features in many areas around Lake...

We explored the potential impact of climate change on the hydrology and water resources of the Seyhan River Basin in Turkey. A dynamic downscaling method referred to as pseudo warming was used to connect the output of raw general circu- lation models (GCMs) and river basin hydrologic models. The downscaled data covered two subset periods (the 10 ye...

Many large-scale irrigation projects in the arid and semi-arid regions are now facing structural changes. Water management responsibilities are being transferred from governments to end-users; water distribution management of gravity irrigation networks, designed for mono-cropping system, is becoming more complicated by diversifying cropping patter...

The impacts of sea-level rise in low lands and the effect of barrier walls for reducing saltwater intrusion were investigated by laboratory experiments. The experiments revealed that sea-level rise induce saltwater intrusion into coastal aquifers, which in turn reduces fresh groundwater resources, causes water logging, and accumulates salt on groun...

During the last decade, many government managed water allocation schemes were transferred to private organizations such as water users' associations (WUAs). The transfer of water management authority from government to WUAs had significant impacts on improving operation and maintenance of irrigation canals as well as increasing water fee collection...

日本列島は海に囲まれ, 重要な社会経済基盤がゼロメートル地帯に集積しているため, 地球温暖化に伴う海面上昇が海岸帯水層中の地下水システムに及ぼす影響を予測しておく必要がある. そこで, 地表湛水の処理が可能で, 地表面が傾斜した地域へも適用できる塩水浸入解析のための数値解法, SIFEC (Salt-water Intrusion by Finite Elements and Characteristics), を開発した. 本法では, 密度流を解析するためのガラーキン型有限要素法と物質輸送を解析するための特性曲線型有限要素法を連成させ, 移流方程式の解析においては濃度補間の精度を向上させるため, single-step reverse particle trackingに双2次内挿スキーム...

According to IPCC, global warming may b ring about rise in mean sea-level by 9cm - 88cm at the end of 21st century. Because the Japanese archipelago is surrounded by sea and important socioeconomic activities concentrate in areas below sea-level, it is prerequisite to predict influences of sea-level rise on groundwater systems in coastal aquifers....

Apparent electrical conductivity (ECa) measured by Electromagnetic Induction Method (EIM) at the Hetao irrigation district in China was compared with EC1: 5 of soil water extract. Soil salinities of three soil depths (0-0.3, 0.3-0.6, 0.6-0.9m) under field capacity conditions were estimated using a linear three layers model. As a result, following b...

Aside from the positive impact of irrigation on increasing crop production, in the downstream part of a river basin, irrigation can cause salinity to build up with the increasing depth of the groundwater. The visible influence of the groundwater environment on soil resulting from irrigation can only be observed at the advanced stages of salinity bu...

We developed a new physical model called "Irrigation Management Perform- ance Assessment Model (IMPAM)" for assessing irrigation district's adaptive capac- ity towards climatic and social changes. It is a quasi three dimensional water balance model which represents the effects of irrigation, drainage canal networks and het- erogeneous land use on a...

For studying surface runoff dynamics and testing effects of land conservation techniques, an on-farm observation was conducted at a moderately sloped (2.8%) pearl millet field in the southwestern part of Niger, West Africa, during the rainy season in 1998 and 1999. Runoff volumes and eroded soil were measured at 4 experimental runoff plots, 20m×2m...

To study basic functions of land conservation techniques, an on-farm observation was conducted at a moderately sloped pearl millet field in the southwestern part of Niger, West Africa, during the rainy seasons of 1998 through 2000. Water balance elements and plant growth were observed. Application of crop residue before the onset of the season prov...