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Suitability mapping for rice cultivation in Benue State,Nigeria using satellite data Fanan Ujoh

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Geo-Spatial Information Science 2019年第4期22卷 332-344,I0009页

作者： Fanan Ujoh Tertsea Igbawua Moses Ogidi Paul Centre for Sustainability and Resilient Infrastructure and Communities London South Bank UniversityLondonUK Department of Physics Federal University of AgricultureMakurdiNigeria Department of Geography and Environmental Management University of AbujaAbujaNigeria

With rising population,decline in soil productivity and land-based conflicts,the per-capita land availability for cultivation is rapidly decreasing within Benue State,a largely agrarian and small-holder *** study attempts a local-level support for the actualisation of Sustainable Development Goal Number 2(“end hunger,achieve food security and improved nutrition,and promote sustainable agriculture”)by *** Multi-Criteria Decision Making(MCDM)method,remote sensing data from Climate Research Unit(CRU)and in-situ data from Nigeria Meteorological Agency(NIMET)were analyzed by GIS techniques to map the suitability of rice cultivation in the study area,with the integration of Normalized Difference Vegetation Index(NDVI),land cover,slope,temperature,precipitation and soil parameters(cation exchange capacity,pH,bulk density,organic carbon).We apply the various statistical parameters that include mean spatial NDVI;correlation coefficient,standard deviation and Root Mean Square(RMS)between CRU and NIMET *** regression trend analysis is conducted between CRU precipitation and NDVI and between CRU temperature and NDVI from 1985 to *** results reveal that NDVI in highly suitable rice planting regions is higher than marginally suitable regions except in the months of October and November,which shows that the highly suitable regions will yield better than the marginally suitable regions during the dry ***,NDVI is seasonally bimodal in response to precipitation,meaning that vegetation vigor is more dependent on precipitation than ***,the correlation coefficient,standard deviation and RMS between CRU and NIMET precipitation data shows 0.42,108,and 110,respectively,while these three factors between CRU and NIMET temperature data shows 0.88,1.60,and 0.86,*** conclusion,the MCDM approach reveals that upland is more suitable for rice cultivation in Benue State when comparing with the area provided by the Global Land

关键词： CRU data NIMET data rice cultivation suitability mapping Sustainable Development Goals(SDGs) Benue State

Effects of Biochar Particle Size on Methane Emissions from rice cultivation

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Journal of Renewable Materials 2020年第10期8卷 1199-1214页

作者： Patikorn Sriphirom Amnat Chidthaisong Kazuyuki Yagi Nimaradee Boonapatcharoen Sudarut Tripetchkul Sirintornthep Towprayoon The Joint Graduate School of Energy and Environment King Mongkut’s University of Technology ThonburiBangkok10140Thailand Center of Excellence on Energy Technology and Environment PERDOMinistry of Higher EducationScienceResearch and InnovationBangkok10400Thailand Earth System Science Research Cluster King Mongkut’s University of Technology ThonburiBangkok10140Thailand Excellent Center of Waste Utilization and Management Pilot Plant Development and Training InstituteKing Mongkut’s University of Technology ThonburiBangkok10150Thailand School of Bioresources and Technology King Mongkut’s University of Technology ThonburiBangkok10150Thailand

Biochar amendment is generally recognized as an effective mitigation option of methane(CH_(4))emissions from rice *** its mitigation mechanisms are not well understood,the potential relevance of surface area and porosity of biochar has been *** study aimed to evaluate the application of different biochar particle sizes on CH_(4) production,oxidation,and emissions from rice cultivation in a clay loam soil,based on the assumption that porosity and surface area of biochar are directly related to its mitigation *** was grown under greenhouse conditions for two growing seasons,either with 0.5–2 mm(small,SB)or with 2–4 mm(large,LB)*** results show that both sizes of biochar increased soil pH and redox potential(Eh)during rice *** dissolved organic carbon(DOC),nitrate(NO^(−)_(3)),and sulfate(SO^(2−)_(4))also increased under both biochar amendments,but size effects were not *** and LB suppressed the abundance of CH_(4) producers(methanogens)but stimulated the abundance of CH_(4) consumers(methanotrophs).The increase of soil Eh and electron acceptors(NO^(−)_(3)and SO^(2−)_(4))indicated the increase in soil oxidation capacity is a barrier to CH_(4) production by methanogens in both biochar *** incubation experiments showed that CH_(4) production activity was significantly(p≤0.05)reduced by 18.5%using SB and by 11.3%using LB compared to the *** contrast,the stimulation of methanotrophs promoted greater CH_(4) oxidation activity by 15.0%in SB and 18.7%in LB compared to the *** shows that CH_(4) production was reduced more by larger surface area biochar(SB),while a greater increase in CH_(4) oxidation was found using larger pore volume biochar(LB).The effects on CH_(4) production were more pronounced than those on CH_(4) oxidation,resulting in a greater reduction of cumulative CH_(4) emissions by SB than LB(by 26.6%and 19.9%compared to control,respectively).

关键词： Biochar particle size CH_(4)production CH_(4)oxidation CH_(4)emission rice cultivation

Effects of Land Management Practices on Labile Organic Carbon Fractions in rice cultivation

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Chinese Geographical Science 2009年第3期19卷 241-248页

作者： SHAO Jing＇an LI Yangbing WEI Chaofu XIE Deti College of Geography Science Chongqing Normal University Chongqing 400047 China College of Resource and Environment Southwest University Chongqing 400716 China

A research trial with four land management practices, i.e., traditional tillage-fallow (TTF), traditional tillage-wheat (TTW), conservation tillage-fallow (CTF) and conservation tillage-wheat (CTW), was sampled in the 15th year after its establishment to assess the effects of different management practices on labile organic carbon fractions (LOCFs), such as easily oxidizable organic carbon (EOC), dissolved organic carbon (DOC), particulate organic carbon (POC) and microbial biomass carbon (MBC) in a typical paddy soil, Chongqing, Southwest China. The results indicated that LOCFs were significantly influenced by the combination of no-tillage, ridge culture and crop rotation. And, different combination patterns showed different effectiveness on soil LOCFs. The effects of no-tillage, ridge culture and wheat cultivation on EOC, DOC, POC and MBC mainly happened at 0-10cm. At this depth, soil under CTW had higher EOC, DOC, POC and MBC contents, compared to TTF, TTW and CTF, respectively. Moreover, the contents of LOCFs for different practices generally decreased when the soil depth increased. Our findings suggest that the paddy soil in Southwest China could be managed to concentrate greater quantities of EOC, DOC, POC and MBC.

关键词： no-tillage rice-wheat rotation ridge culture labile organic carbon fraction rice cultivation

Analysis on Input-Output in rice cultivation Based on Cobb-Douglas Production Function

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Agricultural Science & Technology 2012年第4期13卷 716-718页

作者：高雷中国社会科学院农村发展研究所北京100081 中国农业科学院研究生院北京100081

[Objective] To analyze the input and output in rice cultivation based on CD function. [Method] Based on the input factors, Cobb-Douglas production （CD） function was used to do the quantitative analysis on the input-output in rice production with rice growers as the objective. [Result] Considering the substitution effect of labor in- put and capital input, under the same technical conditions, the effect of increasing labor input on the rice production in per 667 m2 was negative, based on which 2 pieces of policy suggestions were put forward to promote the transfer of surplus la- bor force of rice growers and ensure the capital supply for rice production. [Conclusion] This study laid the foundation for the realization of reasonable allocation of rice production resources.

关键词： Cobb-Douglas production function rice cultivation Input Output

rice ***:How rice Farming Shaped Informal Finance in China

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China Economist 2023年第3期18卷 94-111页

作者： Zhang Bo Sun Tao School of Economics at Shandong University The Center for Economic Research at Shandong UniversityJinanChina

China’s financial system is characterized by the coexistence of both formal and informal finance,and informal finance appears to be more prevalent in the south of the country compared to the *** this paper,we use the historical demarcation of rice-farming regions and the percentage area of rice sown to ascertain the regional distribution of rice farming in the south and wheat farming in the north in order to analyze the role of rice farming in the evolution of different types of financial institutions in *** find that rice cultivation has a positive effect on informal financial development,though its impact on formal finance is *** wheat farming,rice cultivation requires farmers to collaborate during busy farming seasons and necessitates the construction of irrigation *** collaboration helped enhance an acquaintance society,in which both parties to transactions enforced the rules and contract terms of their own initiative,paving the way for informal *** paper not only demonstrates the cultural roots of the regional financial disparities in China but also expands the research on the ways in which farming practices from the past have shaped the development of China’s present financial markets.

关键词： rice cultivation informal finance formal finance historical origins

Estimating rice paddy areas in China using multi-temporal cloud-free normalized difference vegetation index (NDVI) imagery based on change detection

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Pedosphere 2020年第6期30卷 734-746页

作者： Bolun LI Chaopu TI Xiaoyuan YAN State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China

The spatial pattern of rice paddies is an essential parameter used for studies of greenhouse gas emissions,agricultural resource management,and environmental *** large spatial scales,previous studies have usually mapped rice paddies using a single vegetation index product based on a traditional classification method,or a combined analysis of various vegetation and water indices derived from the moderate resolution imaging spectroradiometer(MODIS)satellite ***,different indices increase the computational cost and constrain the satellite data sources,and traditional classification methods(e.g.,maximum likelihood classification)may be time-consuming and difficult to carry out over a large area like *** this study,we designed an auto-thresholding and single vegetation index(normalized difference vegetation index(NDVI))-based procedure to estimate the spatial distribution of rice paddies in *** MOD09Q1 product,which was available at MODIS’s highest spatial resolution(250 m),was taken as the input *** auto-threshold function was also introduced into the change detection process to distinguish rice paddies from other *** MODIS-derived maps were validated with ground surveys and then compared with China national statistical data of rice paddy *** results indicated that the best classification result was achieved for plain regions,and that the accuracy declined for hilly regions,where the complex landscape could lead to an underestimation of the rice paddy area.A comparison between the modeled results and other analyses using 500-m MODIS data suggests that rice paddies may be identified routinely using a single vegetation index with finer resolution on large spatial scales.

关键词： HANTS algorithm moderate resolution imaging spectroradiometer(MODIS) land surface water index Otsu’s algorithm rice cultivation

Use of Multi-Method Approach for a Gravity Irrigation Network Diagnosis: Case of Karfiguela Paddy Field in Burkina Faso

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Agricultural Sciences 2022年第12期13卷 1396-1420页

作者： Hillary Marie Michelle Compaore Élie Serge Gaë tan Sauret Ouindinboudé Jacques Kissou Mahougbé August Abdon Kinglo Pascal Bazongo Poulouma Louis Yameogo Mamadou Koita Idriss Serme Institut National de l’Environnement et de Recherches Agricoles (INERA-CNRST) Ouagadougou Burkina Faso Bureau d’Etudes en Geosciences et Georessources (BUGEGO) Bobo Dioulasso Burkina Faso Nazi Boni University Bobo Dioulasso Burkina Faso Projet RESOB Ouagadougou Burkina Faso Ecole Nationale Supérieure d’Ingénieurs de Fada N’Gourma Université de Fada N’Gourma Fada-Ngourma Burkina Faso Institut International de l’Eau et de l’Environnement (2iE) Ouagadougou Burkina Faso

Burkina Faso is an agricultural and landlocked country whose agriculture is dependent on climatic hazards. Irrigated agriculture therefore appears as an alternative to secure, intensify and sustainably increase agricultural production. However, irrigation systems in Burkina Faso suffer from numerous technical, organizational, land and structural problems, which strongly undermine their performance. This is the case of the irrigated perimeter of Karfiguéla which since its development in 1977, has experienced insufficient water. This research has contributed to the reflection on the performance and operation of gravity irrigation networks on the irrigated perimeter in Burkina Faso and the contribution of satellite images in the mapping of irrigated perimeters. Then, an approach based on a mapping of hydraulic networks and on four main diagnostic methods were used: 1) mapping of hydraulic networks, 2) a detailed visual inspection of hydraulic infrastructure, 3) estimation of canals’ hydraulic efficiency, 4) surveys of the various actors involved in the management of the perimeter. These methods lead to the same results concerning the state of degradation and the functioning of irrigation networks in wet seasons. In terms of results, Karfiguéla perimeter has a net area of 360 ha and is supplied by a network made up of a supply canal, a primary canal, four (4) secondary canals, 37 tertiary ones, and quaternary ones for plots of water supply, all in ordinary concrete except the quaternary which are in rammed soil. The efficiency of the canals in the rainy season, greater than 100%, shows that the irrigation network during this period functions as a drainage network while the real drainage network is disorderly and non-functional. The damage to the irrigation network, siltation, grassing, erosion, overturning, large cracks and many others are all the more severe as we advance toward the Quaternary. The Strickler roughness coefficient values of the order of 68 for the feede

关键词： Irrigated Perimeter Hydraulic Network rice cultivation Water Management Remote Sensing

Effects of light-emitting diodes on tissue culture plantlets and seedlings of rice (Oryza sativa L.)

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Journal of Integrative Agriculture 2020年第7期19卷 1743-1754页

作者： YU Lan-lan SONG Chang-mei SUN Lin-jing LI Lili XU Zhi-gang TANG Can-ming State Key Laboratory of Crop Genetics and Germplasm EnhancementCollege of Agriculture Nanjing Agricultural UniversityNanjing 210095P.R.China Shanghai Chenshan Botanical Garden Shanghai 201602P.R.China Crop Research Institute of Tianjin Tianjin 300384P.R.China

Light-emitting diodes(L EDs)are a new light source with low energy consumption and high photoelectric conversion efficiency,and they can satisfy the energy-saving needs of plant culture ***,the effects of LED light sources on rice tissue culture and rice seedling cultivation are poorly *** study aimed to evaluate the effects of LEDs on the growth of tissue culture plantlets and seedlings of the rice(Oryza sativa L.)cultivar *** best light source for rice tissue culture was different from that for rice seedling ***(B)LED light was the most appropriate light for rice tissue *** a B LED light,the time required for callus proliferation,differentiation and regeneration was the shortest,and the frequency of plantlet ititin,dfferetiation and regeneration was the ***:red(B:R)=1:1LED light facilitated the growth of rice seedlings and produced the highest chlorophyll and carotenoid contents and photosynthetic rates in the rice *** photosynthetic products were more effectively generated in the rice seedlings under the B:R=1:1 LED and R LED lights than under the B LED light.B LED light is the most appropriate light for rice tissue culture plantlets and can be used as an alternative light source for rice tissue culture,and B:R=1:1 LED light facilitated the cultivation of robust rice seedlings and can be used as the primary light source for rice factory seedling cultivation.

关键词： light emitting diodes light quality rice tssue culture rice cultivation

Land Leveling with Modern Machinery for the Implementation of Agricultural Activities in Greece

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Journal of Environmental Science and Engineering 2011年第6期5卷 765-770页

作者： E.A. Karagiannis P.B. Kararizos K.P Zannis M.G. Kalaitzi Institute of Forest Engineering and Surveying School of Forestry and Natural Environment Aristotle University of ThessalonikiThessaloniki 54124 Greece

Incorporating modem and advanced technology （various electronic devices） to excavational machinery led to become more efficient, better quality and cost effective. The continuous development of equipment is also very important in the earth moving procedures which require significant time and expense to achieve the so-called ＂precision agriculture＂ or rather ＂precise management of agricultural inputs＂. One of the ＂precision agricultural＂ works is the land leveling. In recent years, land leveling is done with the use of a scraper （blade） mounted on the agricultural tractor. An electronic system controls the height of the blade automatically, without any operator intervention. In this paper, the field efficiency of the tractor MF6290, of 135 Hp horsepower, is calculated with a leveling blade of 4 m width, in the land leveling of rice cultivation, and in the rotation of different crops in different land preparation conditions （initial and final slope） in the area of Thessaloniki, northern Greece. The raw data revealed that the performance of the tractor ranged from 0.402 to 0.82 lha/h, on a slope 0%, while for surfaces with different initial and final slope, it ranged from 0.107 to 0.118 ha/h.

关键词： Land leveling rice cultivation crop rotation efficiency