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Critical review of the impact of cover crops on soil properties

International Soil and Water Conservation Research 2022年第3期10卷 343-354页

作者： Komlan Koudahe Samuel CAllen Koffi Djaman Biological and agricultural Engineering Department Kansas State University1016 Seaton Hall920 N.Martin Luther King Jr.DriveManhattanKS66506USA Department of Plant and Environmental sciences New Mexico State UniversityAgricultural Science Center at FarmingtonP.O.Box 1018FarmingtonNM87499USA

Grasses as well as leguminous and non-leguminous broadleaves are the major categories of commonly grown cover crops *** review focuses on the contribution of cover crops to soil *** review first considers the single and mixed cover crops and shows that grass species are desirable for their decay and ability to provide substantial soil cover,broadleaf species are used for their quick decomposition and capacity of releasing residues into the soil,while the leguminous species are used for their ability to fix atmospheric ***,the impacts of cover crops on soil health are *** cover crops into conventional cropping systems may reduce soil bulk density,improve soil structure and hydraulic properties to facilitate increased water infiltration and *** residue additions from cover crops may enhance soil organic C and N accretion as well as increase availability of P,K,Ca,Fe and Mg in some soil types under certain climatic ***,cover crops may provide a better condition for microbial activity,abundance,and ***,the review shows that through proper management,cover crops may be utilized as an essential component of soil conservation practices for enhanced soil ***,further investigation is necessary to determine cover crop effects in additional cropping systems and climatic zones as well as the long-term effects of cover crops on soil properties,subsequent crop yield,and overall cropping system *** review is an important source of information for crop growers,crop management institutions,universities,and crop consultants for sustainable agricultural production.

关键词： Cover crops Soil properties Grasses Leguminous

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Neural progenitor cells derived from fibroblasts induced by small molecule compounds under hypoxia for treatment of Parkinson’s disease in rats

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Neural Regeneration Research 2023年第5期18卷 1090-1098页

作者： Yu Guo Yuan-Yuan Wang Ting-Ting Sun Jia-Jia Xu Pan Yang Cai-Yun Ma Wei-Jun Guan Chun-Jing Wang Gao-Feng Liu Chang-Qing Liu School of Laboratory Medicine School of Life SciencesBengbu Medical CollegeBengbuAnhui ProvinceChina National Germplasm Resource center for Domestic Animals Institute of Animal ScienceChinese Academy of Agricultural ScienceBeijingChina Department of Neuroscience University of Connecticut Health CenterFarmingtonCTUSA

Neural progenitor cells(NPCs) capable of self-renewal and differentiation into neural cell lineages offer broad prospects for cell therapy for neurodegenerative diseases. However, cell therapy based on NPC transplantation is limited by the inability to acquire sufficient quantities of NPCs. Previous studies have found that a chemical cocktail of valproic acid, CHIR99021, and Repsox(VCR) promotes mouse fibroblasts to differentiate into NPCs under hypoxic conditions. Therefore, we used VCR(0.5 mM valproic acid, 3 μM CHIR99021, and 1 μM Repsox) to induce the reprogramming of rat embryonic fibroblasts into NPCs under a hypoxic condition(5%). These NPCs exhibited typical neurosphere-like structures that can express NPC markers, such as Nestin, SRY-box transcription factor 2, and paired box 6(Pax6), and could also differentiate into multiple types of functional neurons and astrocytes in vitro. They had similar gene expression profiles to those of rat brain-derived neural stem cells. Subsequently, the chemically-induced NPCs(ciNPCs) were stereotactically transplanted into the substantia nigra of 6-hydroxydopamine-lesioned parkinsonian rats. We found that the ciNPCs exhibited long-term survival, migrated long distances, and differentiated into multiple types of functional neurons and glial cells in vivo. Moreover, the parkinsonian behavioral defects of the parkinsonian model rats grafted with ciNPCs showed remarkable functional recovery. These findings suggest that rat fibroblasts can be directly transformed into NPCs using a chemical cocktail of VCR without introducing exogenous factors, which may be an attractive donor material for transplantation therapy for Parkinson’s disease.

关键词： cell reprogramming cell transplantation hypoxia neural progenitor cells neurological function Parkinson’s disease small molecule compounds substantia nigra

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Evapotranspiration, Grain Yield, and Water Productivity of Spring Oat (Avena sativa L.) under Semiarid Climate

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agricultural sciences 2018年第9期9卷 1188-1204页

作者： Koffi Djaman Michael O’Neill Curtis Owen Komlan Koudahe Kevin Lombard Department of Plant and Environmental sciences New Mexico State University Agricultural Science Center at Farmington Farmington NM USA ADA Consulting Africa Lomé Togo

Spring oat (Avena sativa) is produced for grain, hay, and green manure and can be integrated into a cropping system as a cover crop. Twenty-eight oat genotypes (G1, G2, G3, …., G28), selected for their adaptability to the Southwestern United States, were evaluated for their yield performance under sprinkler irrigation during four growing seasons (2005-2008) at the agricultural science center at farmington, New Mexico State University. The genotypes were arranged in randomized complete blocs design with four replications. Irrigation scheduling was based on evapotranspiration and the depletion criterion of 40% to 45% total available water (TAW) was practiced to prevent the plants from experiencing any water stress. Crop evapotranspiration estimated by the FAO crop coefficient and reference evapotranspiration approach was low about 2 mm/day during crop initial stage and increased with plant growth and reached the maximum during crop mid-season or reproductive stage. It decreased during crop late season. Daily crop evapotranspiration varied from 0.5 to 12.6 mm in 2008 and the seasonal Spring oat evapotranspiration varied from 535.8 to 591 mm. Averaged across the four growing seasons, oat evapotranspiration was 570.4 mm. The results showed that Spring oat plant height varied significantly with genotypes and ranged from 59.1 to 100.8 cm. Oat grain yield significantly varied with years and genotypes. Grain yield varied from 3386 to 6498 kg/ha and average yield was 4245, 4265, 5477, and 4025 kg/ha during the 2005, 2006, 2007 and 2008, respectively. The best performing genotypes were G1, G2, G7, G19, G20, G21 and G23 with average yield greater than 4800 kg/ha while G3, G13, G17 and G27 showed the lowest yield among the genotypes. Oat crop water use efficiency (CWUE) varied with genotype and years and ranged from 0.53 to 1.07 kg/m3 and averaged 0.65, 0.78, 0.91 and 0.70 kg/m3 in 2005, 2006, 2007 and 2008, respectively. The highest CWUE was achieved by G19 and the lowest CWUE

关键词： Spring Oat Genotypes Evaluation Grain Yield Water Productivity High Elevation Semiarid Climate

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Sensitivity Analysis of the Penman-Monteith Reference Evapotranspiration to Climatic Variables: Case of Burkina Faso

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Journal of Water Resource and Protection 2017年第12期9卷 1364-1376页

作者： Papa Malick Ndiaye Ansoumana Bodian Lamine Diop Koffi Djaman Laboratoire Leï di “Dynamique des Territoires et Développement” Université Gaston Berger (UGB) Saint Louis Senegal UFR S2ATA sciences Agronomiques de l’Aquaculture et des Technologies Alimentaires Université Gaston Berger Saint-Louis Senegal nmsu: agricultural science center at farmington Department of Plant and Environmental Sciences New Mexico State University Farmington USA

Sensitivity analysis is important in understanding the effect of each climatic input variable on the variation of the evapotranspiration which is a significant element for hydrological modelling, irrigation programs, and water resources management. This study investigates the responses of evapotranspiration to the variation of maximum and minimum temperature, solar radiation, wind speed and maximum and minimum relative humidity. Daily data from 1998 to 2012 of eight stations are used. For each climatic variable, a variation of 5% up to ±25% was performed in order to evaluate the sensitivity of the evapotranspiration to the input variables. Results show that evapotranspiration is more sensitive to the variation of solar radiation, maximal temperature and wind speed, respectively.

关键词： Evapotranspiration Penman-Monteith Sensitivity Coefficient Burkina Faso

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Evaluation of Eleven Reference Evapotranspiration Models in Semiarid Conditions

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Journal of Water Resource and Protection 2017年第12期9卷 1469-1490页

作者： Koffi Djaman Komlan Koudahe Christopher Oluwakunmi Akinbile Suat Irmak Department of Plant and Environmental sciences New Mexico State University Agricultural Science Center at Farmington Farmington USA ADA Consulting Africa Lome Togo Department of agricultural & Environmental Engineering Federal University of Technology Akure Nigeria Department of Biological Systems Engineering University of Nebraska-Lincoln Lincoln USA

The objectives of this study were to evaluate the performance of the FAO Penman Monteith reference evapotranspiration model under limited data and some mine temperature methods of reference evapotranspiration (ETo) under the semiarid and arid conditions in Mali. The results showed that under limited data conditions, the FAO-PM equation achieved accurate estimation of daily ETo when solar radiation, relative humidity, and wind speed are lacking individually with root mean squared errors (RMSE) averaging 0.52, 0.56 and 0.62 mm/day, respectively. Much more accurate ETo was estimated under relative humidity and wind speed missing data conditions with RMSE varying from 0.20 to 0.58 mm/day and average RE, MBE and MAE of 6.7%, -0.25 mm/day and 0.30 mm/day. The Jensen-Haise equation systematically overestimated ETo while the Hansen, Christiansen, and Irmak, and the two Tabari’s equations underestimated ETo at all weather stations. The Abtew equation showed the best performance among the selected ETo equations.

关键词： Reference Evapotranspiration Semiarid and Arid Climate Mali

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Trend Analysis in Annual and Monthly Pan Evaporation and Pan Coefficient in the Context of Climate Change in Togo

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Journal of Geoscience and Environment Protection 2017年第12期5卷 41-56页

作者： Koffi Djaman Komlan Koudahe Komla Kyky Ganyo Department of Plant and Environmental sciences New Mexico State University Agricultural Science Center at Farmington Farm-ington NM USA ADA Consulting Africa Lomé Togo Institut Togolais de la Recherche Agronomique (ITRA) Lomé Togo

Trend analysis was performed for the long-term measured pan evaporation and estimated pan coefficient for 4 meteorological stations during 1976-2011 in Togo. Measured pan evaporation was recorded at four meteorological stations in Togo for the global period of 1976 to 2011 at Lome, Tabligbo, Atakpame, and Sokode. ETo was estimated using the Penman-Monteith model. The Mann-Kendall test was used for trend analysis. The results showed that annual Epan varied from 1803 to 2081 mm at Lome, from 1294 to 1496 mm at Tabligbo, from 1605 to 1974 mm at Atakpame and from 1839 to 1990 mm at Sokode. It had significant increasing trend at Lome, Tabligbo, and Sokode and a negative trend at Atakpame. Monthly Epan varied from 137 to 197 mm at Lome, 89 to 149 mm at Tabligbo, 137 to 214 mm at Atakpame and from 137 to 190 mm at Sokode. At Lome, Kpan varied from 0.61 to 1.17 and averaged 0.81. At Tabligbo, Kpan varied from 0.59 to 0.98 and averaged 0.75. At Atakpame, Kpan varied from 0.5 to 2.0 and averaged 1.12. At Sokode, Kpan varied from 0.43 to 1.92 and averaged 0.98. Monthly mean Kpan is recommended for use in hydrological studies, irrigation scheduling and water management in Togo.

关键词： Trend Analysis Pan Evaporation Annual Monthly Kpan Togo

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Pepper variome reveals the history and key loci associated with fruit domestication and diversification

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Molecular Plant 2022年第11期15卷 1744-1758页

作者： Yacong Cao Kang Zhang Hailong Yu Shumin Chen Donghui Xu Hong Zhao Zhenghai Zhang Yinqing Yang Xiaozhen Gu Xinyan Liu Haiping Wang Yaxin Jing Yajie Mei Xiang Wang Véronique Lefebvre Weili Zhang Yuan Jin Dongliang An Risheng Wang Paul Bosland Xixiang Li IIan Paran Baoxi Zhang Giovanni Giuliano Lihao Wang Feng Cheng Key Laboratory of Vegetables Geneticsand Physiology of China Ministry of Agriculture and Rural AffairsKey Laboratory of Biology and Genetic Improvement of Horticultural Crops of the Ministry of Agriculture and Rural AffairsSino-Dutch Joint Laboratory of Horticultural GenomicsInstitute of Vegetables and FlowersCAAS(Chinese Academy of Agricultural Sciences)12 Zhongguancun South StreetBeijing 100081P.R.China INRAE GAFLUnitéde Génétique et Amélioration des Fruits et Légumes84140 MontfavetFrance Institute of Vegetables Academy of Agricultural Sciences of Guangxi174 Daxue East RoadNanning 53007P.R.China Department of Plant and Environmental sciences NMSULas CrucesNM 88003USA Institute of Plant sciences Agricultural Research OrganizationThe Volcani CenterRishon LeZionIsrael Biotechnology and Agroindustry Division ENEAItalian National Agency for New TechnologiesEnergy and Sustainable DevelopmentVia Anguillarese301-00123 RomaItaly

Pepper(Capsicum spp.)is an important vegetable crop that provides a unique pungent sensation when *** construction of a pepper variome map,we examined the main groups that emerged during domestication and breeding of ***,their relationships and temporal succession,and the molecular events underlying the main *** results showed that the initial differentiation in fruit shape and pungency,increase in fruit weight,and transition from erect to pendent fruits,as well as the recent appearance of large,blocky,sweet fruits(bell peppers),were accompanied by strong selection/fixation of key alleles and introgressions in two large genomic ***,we identified Up,which encodes a BIG GRAIN protein involved in auxin transport,as a key domestication gene that controls erect vs pendent fruit *** up mutation gained increased expression especially in the fruit pedicel through a 579-bp sequence deletion in its 5′upstream region,resulting in the phenotype of pendent *** function of Up was confirmed by virus-induced gene *** together,these findings constitute a cornerstone for understanding the domestication and differentiation of a key horticultural crop.

关键词： Capsicum variome domestication fruit orientation pungency fruit shape sweet pepper blocky fruit pepper narrow fruit pepper

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Performance of Twelve Mass Transfer Based Reference Evapotranspiration Models under Humid Climate

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Journal of Water Resource and Protection 2017年第12期9卷 1347-1363页

作者： Koffi Djaman Komlan Koudahe Mamadou Sall Isa Kabenge Daran Rudnick Suat Irmak Department of Plant and Environmental sciences New Mexico State University Agricultural Science Center Farmington USA ADA Consulting Africa Lomé Togo Research Scientist Institut Senegalais de Recherches Agricoles Centre de Saint Louis Saint Louis Sénégal Department of agricultural and Biosystems Engineering Makerere University Kampala Uganda Department of Biological Systems Engineering University of Nebraska-Lincoln Chase Hall Lincoln USA

Reference evapotranspiration is very important parameter in the hydrological, agricultural and environmental studies and is accurately estimated by the FAO Penman-Monteith equation (FAO-PM) under different climatic conditions. However, due to data requirement of the FAO-PM equation, there is a need to investigate the applicability of alternative ETo equations under limited data. The objectives of this study were to evaluate twelve mass transfer based reference evapotranspiration equations and determine the impact of ETo equation on long term water management sustainability in Tanzania and Kenya. The results showed that the Albrecht, Brockamp-Wenner, Dalto, Meyer, Rohwer and Oudin ETo equations systematically overestimated the daily ETo at all weather stations with relative errors that varied from 34% to 94% relative to the FAO-PM ETo estimates. The Penman, Mahringer, Trabert, and the Romanenko equations performed best across Tanzania and the South Western Kenya with root mean squared errors ranging from 0.98 to 1.48 mm/day, which are relatively high and mean bias error (MBE) varying from -0.33 to 0.02 mm/day and the absolute mean error (AME) from 0.79 to 1.16 mm/day. For sustainable water management, the Trabert equation could be adopted at Songea, the Mahringer equation at Tabora, the Dalton and/or the Rohwer equations at Eldoret, the Romanenko equation at Dodoma, Songea and Eldoret. However, regional calibration of the most performing equation could improve water management at regional level.

关键词： Reference Evapotranspiration Mass Transfer Eastern Africa Water

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Corrigendum to"Critical review of the impact of cover crops on s properties"[*** Water ***.10(2022)343-354]

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International Soil and Water Conservation Research 2023年第1期11卷 224-224页

作者： Komlan Koudahe Samuel C.Allen Koffi Djaman Biological and agricultural Engineering Department Kansas State University1016 Seaton Hall920 N.Martin Luther King Jr.DriveManhattanKS66506USA Department of Plant and Environmental sciences New Mexico State UniversityAgricultural Science Center at FarmingtonP.o.Box 1018FarmingtonNM87499USA

The authors regret that *** and Augustine *** who had edited,reviewed and rewritten the manuscript were omitted in the printed version of the above article and have agreed to credit them authorship for this *** list o... 详细信息

关键词： crops Logan agreed

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Trend Analysis in Rainfall, Reference Evapotranspiration and Aridity Index in Southern Senegal: Adaptation to the Vulnerability of Rainfed Rice Cultivation to Climate Change

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Atmospheric and Climate sciences 2017年第4期7卷 476-495页

作者： Komlan Koudahe Koffi Djaman Ansoumana Bodian Suat Irmak Mamadou Sall Lamine Diop Alpha B. Balde Daran R. Rudnick Direction des Filières Végétales (DFV) MAEH Lomé Togo Department of Plant and Environmental sciences New Mexico State University Agricultural Science Center at Farmington Farm-ington NM USA Laboratoire Leïdi “Dynamique des territoires et développement” Université Gaston Berger (UGB) Saint Louis Sénégal Department of Biological Systems Engineering University of Nebraska-Lincoln Chase Hall Lincoln NE USA Research Scientist Institut Senegalais de Recherches Agricoles Centre de Saint Louis Saint Louis Sénégal UFR S2ATA Université Gaston Berger (UGB) Saint Louis Sénégal Institut Sénégalais de Recherches Agricoles Bambey Sénégal

Rainfall and evapotranspiration are two vital elements for food production under rainfed agriculture. This study aims at investigating the combined changes in these variables in the form of aridly index in the southern Senegal. The temporal trends in annual and monthly (from May to October) aridity index, rainfall and evapotranspiration are examined and adaptation strategies to the vulnerability of rainfed rice cultivation to the changes are developed. The results show a significant decreasing trend in annual rainfall at all study locations for the period 1922-2015. When analyzing the trends in sub-periods, there are two clear patterns in the annual rainfall series: a decreasing trend for the period 1922-1979 and a reversal increasing trend for the period 1980-2015. An increasing trend is also observed in annual reference evapotranspiration. The results reveal that the region will be drier with a significant increase in aridity at the annual and most monthly series. Appropriate adaptation strategies should be implemented to diminish the adverse influence of the increasing aridity on rice productivity for a sustainable agriculture.

关键词： Variation Evapotranspiration Rainfall Aridity Index Senegal Rainfed Rice

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