Kazuyuki Inubushi

Tokyo University of Agriculture · Department of Agricultural Chemistry

For sustainable food production in the Mekong Delta, local information on irrigation status is essential for allocating water resources efficiently at the community level. ALOS-2 PALSAR-2 L-band SAR can be used to detect submerged and nonsubmerged soil covered by rice plants at a spatial resolution compatible with field observation but a low tempor...

The lowland tropical triple-cropping rice system has unique characteristics that affect the hydrological, nutrient, and atmospheric environments. To better understand the ecosystem carbon and water dynamics of a triple-cropping rice paddy from the perspective of sustainability, ecosystem-level CO2 flux and ecosystem water use efficiency (eWUE) were...

Paddy soils are the dominant source of nitrogen for rice via mineralization, and knowledge about the available nitrogen (AN) in paddy soil is important for rice cultivation. Although the relationship between AN and soil physicochemical parameters has been studied, no systematic studies of the relationships between AN and the soil moisture content o...

This comparative investigation aimed to evaluate controlling factors for the changes of chemical and microbial properties in soils taken from chemical fertilizer experiments carried out mainly in Chernozem and Andosol in Hungary and Japan, respectively. The plant available nutrient content of the soil, the stock of C and N and the soil microbial pa...

Microplastics cause environmental problems. Biodegradable plastics have become popular because they aim to avoid such problems. However, their decomposition in the soil may have an impact. This study aims to investigate the effects of biodegradable plastics on the physicochemical properties of soil, specifically the production of CO2 and N2O in the...

Approximately 90% of the world’s total rice paddy area and annual production is concentrated in monsoonal Asia. Since rice cropping accounts for about 11% of global anthropogenic CH4 emissions, this region is considered a primary atmospheric methane emission source. As a mitigation measure, the emission reduction potential of water-saving intermitt...

Ozegahara Mire is the largest alpine mire in Japan. The mire has been preserved as the precious peatland ecosystem with high ecological diversity. After the late 20th century, the mire has been exposed to ecosystem disturbance by mire flooding due to heavy rain as well as invaded Sika deer. Especially, browsing and digging of the mire vegetation by...

Composts are an attractive organic-farming alternative to chemical fertilizers and are used for carbon sequestration to increase soil carbon storage. In Japan, a new type of mixed compost fertilizer called compost-compound fertilizer mixture (CCFM) has been registered. It exhibits several merits for organic farming; that is, it is odorless, easy to...

Ozegahara Mire is the largest alpine mire in Japan, and it has been preserved as the precious peatland ecosystem under oligotrophic condition. However, after the late 20 century, the mire has been exposed to ecosystem disturbance by invaded Sika deer. Browsing and digging of the mire vegetation by Sika deer have given considerable impacts on not on...

As a part of the 4th Scientific Research of Ozegahara, physicochemical characteristics and nitrogen metabolism of the peat soil were studied at 39 sites in Ozegahara (July 2017–August 2018). The survey data indicated that the peat soils almost saturated with water were slightly acidic and exhibited high denitrification activity in the soils contain...

Soil is one of the important sources of nitrous oxide (N2O), which is generally producing through soil microbial processes, such as nitrification and denitrification. Agricultural soils receive chemical and organic fertilizers to maintain or increase crop yield and soil fertility, but several factors are influencing N2O emissions, such as types and...

Mangrove forests sequester a significant amount of organic matter in their sediment and are recognized as an important carbon storage source (i.e., blue carbon, including in seagrass ecosystems and other coastal wetlands). The methane-producing archaea in anaerobic sediments releases methane, a greenhouse gas species. The contribution to total gree...

In the Mekong Delta, triple rice cropping is widely spread. The rice cultivation is characterized by a short cropping period and nearly year-round flooding. Putting the soil under an oxidative condition through changing the water regimes during cropping periods might have a potential to increase the rice yield. To test this potential, an experiment...

Precipitation in Uzbekistan is limited, so irrigation must be used widely in local agriculture. However, irrigation is carried out with inadequate drainage systems that result in salt damage, as the re-accumulation of salt from irrigation water on the soil surface; thus, soil salinization becomes severe in irrigated agricultural areas. To address t...

Rhizodeposits in rice paddy soil are important in global C sequestration and cycling. This study explored the effects of elevated CO2 and N fertilization during the rice growing season on the subsequent mineralization and retention of rhizodeposit-C in soil aggregates after harvest. Rice (Oryza sativa L.) was labeled with 13CO2 under ambient (400 p...

The 2030 Agenda was promulgated for the Sustainable Develop Goals (SDGs), which consist of 17 goals created to eradicate poverty and realize a more sustainable world. Among the goals, soil science can contribute significantly toward achieving zero hunger (#2), implementing climate action (#13), bettering life on land (#15), among others. Paddy fiel...

Two-year field experiments were conducted at Tamil Nadu Rice Research Institute, Aduthurai, Tamil Nadu, India, to evaluate the effect of continuous flooding (CF) and alternate wetting and drying (AWD) irrigation strategies on rice grain yield and greenhouse gas emissions from double-cropping paddy rice. Field observation results showed that AWD irr...

This research aims to determine the growth response of corn plants (Zea mays) given zeolite coated urea fertilizer as a nitrogen slow-release fertilizer. This research uses Randomized Group Design (RGD) with 3 repeats. The observation parameters are. Corn plant growth including corn cob weight (grams), corn cob length (cm) and corn kernel weight (g...

Field and incubation experiments were conducted to determine the emission rate of greenhouse gases, nitrogen change, populations of AOB, NOB, and fungi as well as growth of corn in response to amendment of urea granulated with and without nitrification inhibitors and zeolite. The application of urea with neem, urea with zeolite, urea with zeolite +...

This study aims to characterize soil chemical properties and microbial biomass, greenhouse gas production, and organic matter dynamics in upland rice field as affected by the long-term fertilizer managements in Uganda. Soil total C (TC) and N (TN) contents were in the relatively smaller range under different fertilizer treatments, even after 20 cro...

In Malaysia, soils derived from sedimentary rocks are extensively used for agricultural purposes with oil palm and rubber being the main dwellers. In order to understand the environmental impact of these perennial crops planting, the variability of physicochemical properties of 25 representative soils derived from sedimentary rocks under different...

The author regret that the above article originally published with an error in the equation under “Calculation of GHG emission, PE, C-mineralization, microbial C use efficiency, and enzyme activity” section. The corrected equation is now presented in this article.

The effect of mineral fertilization and its application pattern on microbial activity and the subsequent CO2 and CH4 emissions arising from soil organic matter (SOM) or added substrate remains unclear. We quantified the decomposition of ¹³C-labeled straw and the priming effect (PE) governed by the N and P fertilizer application pattern during a 100...

This research study aims to determine the production of nitrous oxide (N 2 O), carbon dioxide (CO 2 ), the rate of ammonium-nitrate, microbe responses in soil following the addition of urea coated by zeolite under soil incubated. The result showed that urea granulated with zeolite in soil sample had a significant effect on the production of CO 2 an...

The influence of organic and conventional farming and agroecology on the diversity and functioning of indigenous soil microbial communities was examined using a multifactorial analysis based on an extended minimum data set of classical status and functional tests. Main soil physicochemical properties and selected microbiological indicators, the qua...

A field experiment was carried out to determine the emissions of nitrous oxide (N2O) and methane (CH4) and yield of rice grains under water management of continuously flooded (CF) and non-continuously flooded (NCF) systems and to find out those were affected by both input of water managements in combination with urea granulated with nitrification i...

Climate change is a vital environmental issue for the twenty-first century, which may significantly affect rice productivity and accelerate greenhouse gas emissions from paddy ecosystem , which is of great environmental concern which is of great environmental concern. Methane (CH 4) and nitrous oxide (N 2 O) are the most important greenhouse gases...

In this study, we conducted an incubation experiment on a frozen soil core collected from a black spruce forest in Interior Alaska, in order to investigate potential changes in greenhouse gaseous (GHG) and microbial dynamics during thawing of frozen soil. The soil thawing is an important environmental process determining the annual GHG balance in t...

Data on four yield components obtained from a long-term experiment, in which NERICA 4 was continuously planted under upland conditions for 17 seasons, were analyzed together with rainfall data. Results showed that rainfalls gave significant positive effects on the number of spikelets panicle-1 (Spikelets), the rate of grain filling (Gf), and 1000-g...

Water-intensive systems of rice cultivation are facing major challenges to increase rice grain yield under conditions of water scarcity while also reducing greenhouse gas (GHG) emissions. The adoption of effective irrigation strategies in the paddy rice system is one of the most promising options for mitigating GHG emissions while maintaining high...

In paddy soils in the Mekong Delta, soil archaea emit substantial amounts of methane. Reproducing ground flux data using only satellite-observable explanatory variables is a highly transparent method for evaluating regional emissions. We hypothesized that PALSAR-2 (Phased Array type L-band Synthetic Aperture RADAR) can distinguish inundated soil fr...

Long-term unregulated mining of ion-adsorption clays (IAC) in China has resulted in severe ecological destruction and created large areas of wasteland in dire need of rehabilitation. Soil amendment and revegetation are two important means of rehabilitation of IAC mining wasteland. In this study, we used sludge biochar prepared by pyrolysis of munic...

The global warming has a potential for acceleration of labile soil organic carbon decomposition. Arrhenius equation is one of the useful equation for predicting temperature sensitivity of carbon decomposition, with the activation energy of rate constant being a key factor. The purpose of this study is the evaluation of temperature sensitivity of la...

Soil respiration as a major component of the carbon cycle has received considerable attention because of its role in amplifying global warming and in climate feedbacks of ecosystems. This makes it important for us to devise reliable methods in order to measure soil CO2 effluxes accurately. In this study, we investigated the variations of CO2 efflux...

Rice (Oryza sativa L.) production is facing major challenges, including scarcity of irrigation water and ongoing climate change. Modifications of the current cropping techniques could increase yield, save water, and mitigate greenhouse gas emission. We investigated the effect of planting methods (young seedlings, wide spacing with alternate wetting...

The oil palm plantations have been expanding into the different slope positions, through its association with deforestation and nitrogen fertilizer use and concerning emission of greenhouse gases. However the interactions of soil properties and topography influencing greenhouse gas fluxes are still poorly understood. Topography affects the movement...

Methane is one of the greenhouse gases emitted from paddy soil ecosystems and may induce global warming and climate change; therefore, mitigation options are urgently required to establish mitigation technology to reduce methane emission without affecting rice production. Methane is produced by a balance between oxidizing agents (such as iron) and...

Methane leads to global warming owing to its warming potential higher than carbon dioxide (CO2). Rice fields represent the major source of methane (CH4) emission as the recent estimates range from 34 to 112 Tg CH4 per year. Biogenic methane is produced by anaerobic methanogenic archaea. Advances in high-throughput sequencing technologies and isolat...

We conducted a series of field experiments to study the effects of rice straw compost (RSC) and chemical fertilizer application on soil carbon and silicon under a double rice cropping system for 25 crops successive in the Mekong Delta, Vietnam. The results showed that the continuous application of RSC (6 Mg ha－1 as fresh weight for each crop) cause...

Methane leads to global warming. • Rice fields represent the major source of methane emission. • Biogenic methane is produced by anaerobic methanogenic archaea. • We summarize the current knowledge on the diversity and activity of methanogens. • Review will contribute to formulating strategies for CH 4 mitigation. a b s t r a c t Methane leads to g...

The minirhizotron technique is a non-destructive method to evaluate fine roots, which converts two-dimensional image data to three- dimensional root biomass data. Recently, conversion factors in soils at 10-cm depth intervals successfully estimated fine root biomass using image data from the minirhizotron method. However, this technique was conduct...

A field experiment was conducted to study the effects of combination of straw incorporation and water management on fluxes of CH4, N2O and soil heterotrophic respiration (Rh) in a paddy field in subtropical central China by using a static opaque chamber/gas chromatography method. Four treatments were set up: two rice straw incorporation rates at 0...

Red soils are the major land resource in subtropical and tropical areas and are characterized by low phosphorus (P) availability. To assess the availability of P for plants and the potential stability of P in soil, two pairs of subtropical red soil samples from a paddy field and an adjacent uncultivated upland were collected from Hunan Province, Ch...

Nowadays global warming is a major issue to our environment. This issue is generated by the modern human activities like industry and intensive agriculture. This research is about methane emission from rice paddy fields. The aim of the study is to lower the methane emission from the field with the help of using different type of fertilizers, whilst...

Coastal ecosystems represent a potential additional source of the greenhouse gas methane (CH4) that has been insufficiently quantified. Thus, to understand the mechanisms controlling greenhouse gas emissions in these ecosystems, this study investigated CH4 emissions from and the related microbial properties of mangrove soils. Soil and gas samples w...

Results of observations in Central Kalimantan, Indonesia clearly indicate that land use changes caused by drainage, fire, and agricultural practices change the methane (CH4) and nitrous oxide (N2O) emissions from tropical peatlands significantly. The CH4 emissions were higher in burned area and croplands than in natural forests. The N2O emissions w...

Recently, large areas of tropical peatland have been converted into agricultural fields. To be used for agricultural activities, peat soils need to be drained, limed and fertilized due to excess water, low nutrient content and high acidity. Water depth and amelioration have significant effects on greenhouse gas (GHG) production. Twenty-seven soil s...

Carbon and nitrogen compounds and the emission of CO2, CH4, and N2O were studied in the ancient buried and modern background soils developed from different parent materials in the Arkaim Reserve of Chelyabinsk oblast. The studies were performed after an 18-year-long period of absence of anthropogenic loads on the local ecosystems. Element contents...

Studies on greenhouse gas emissions and climate change require huge amounts of data. Generally, these data can be inducted directly from measuring devices or from different systems like geographical information systems and other specific systems, which are used for experimental data storage and management. Database technology has come a long way ov...

Elution of silicon (Si) from three types of slag fertilizers was tested in a paddy field. They were made from granulated blast furnace slag, dephosphorization slag and decarburization slag, respectively. Each fertilizer, embedded in epoxy resin to expose the cross section, was analyzed to get initial two-dimensional distribution images of Si, calci...

ABSTRAK Bahan penghambat nitrifikasi seperti Mimba (Azadirachta indica) dan DCD (Dicyandiamide) mampu menekan laju nitrifikasi. Kombinasi bahan penghambat nitrogen dan pupuk urea diharapkan dapat menekan pengubahan gugus amonia menjadi nitrit dan nitrat yang dapat mengurangi efisiensi aplikasi pupuk nitrogen. Penelitian dilakukan untuk mengetahui r...

The increasing human population requires greater rice production. However, rice cultivation contributes to global warming through greenhouse gas (GHG) emissions. Technologies for reducing GHG emissions in concert with the increased rice production from rice fields are needed. The objectives of this study were to evaluate the effects of steel slag a...

The Mekong Delta produces 21 Mt of rough rice (Oryza sativa L.) and an estimated 24 Mt of straw (dry weight) annually. Approximately one fourth of the straw is burned on the field, which is a common practice in intensive rice cultivation systems in this region because there is limited time to prepare the field for the next crop. The spread of inten...

A microcosm-based study was conducted to evaluate the effects of application of biogas digested liquid or chemical fertilizer on CH4 flux, associated methanogenic archaeal community, soil chemical and microbial properties, and aboveground plant biomass in paddy soil. Our results showed that digested liquid application significantly decreased the se...

In 2011, the radiocesium concentration of brown rice grown (Oryza sativa L.) in mountainous areas with irrigation water that flowed from a nearby mountain forest, in Fukushima Prefecture, Japan, exceeded 500 Bq kg–1. Migration of radiocesium from contaminated irrigation water was suspected. Here, we investigated the migration of dissolved radiocesi...

Aim This study aims to improve our understanding of temporal variations and controlling factors of soil respi-ration (R s) and its components (microbial respiration or R m and root respiration or R b) in an Asian tropical seasonal forest at diurnal, seasonal and annual timescales in relation to biotic and abiotic controls. Methods R s was studied b...

Slag-type fertilizer, which is a byproduct of the steel industry, contains high amount of active iron oxide and silica. This byproduct acts as an oxidizing agent in the agricultural soils and may have positive impact on the soil properties and plant growth. It can suppress CH4 emission, while may also affect N2O emission. A pot experiment with koma...

A microcosm-based study was conducted to evaluate the effects of varying concentrations of biogas digested slurry-based biochar on CH4 flux, associated methanogenic archaeal community, soil chemical and microbial properties, and plant biomass in paddy soil. Our results showed that biochar application significantly increased the CH4 flux compared to...

Arkaim fortified settlement, an outstanding memorial of the Bronze Age in Eurasia, was opened in 1987 in Chelyabinsk region. This is one of the 22 settlements of Sintashta culture (3700–4000 B.P.) of the South Trans-Ural. Its diameter is 170 m. The planning is well-preserved: the outer ditch, ruins of two concentric defensive walls with 66 dwelling...

Biogas production generates digested slurry, as a byproduct, which can be used as fertilizer after its conversion into digested liquid and biochar. A microcosm-based study was conducted to evaluate the effects of chemical fertilizer (CF), digested liquid (DL) and varying concentrations of biogas digested slurry based-biochar along with DL on N2O fl...

New livestock production system based on intensification of large farms produces huge amounts of organic waste materials in the form of farm, animal, domestic and agro-industrial waste all over the world without enough agricultural land for their direct application as fertilizers. Compost stability/maturity has become a critical issue for land appl...