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| 1 | Overview of advances in improving uniformity and water use efficiency of sprinkler irrigation显示文摘Water is the scarcest resource and the importance of the judicious use of water in the agricultural sector for sustaining agricultural growth and the retardation of environmental degradation needs no further elaboration.The successes of using sprinkler irrigation to develop new lands,point the way forward to a much greater role for the development of future land reclamation projects.Water use efficiency through a proper improvement of water management techniques and other production factors are essential to boost on-farm productivity.Various factors affecting uniformity and water use efficiency in sprinkler irrigation have been outlined in this research,highlighting possible ways to improve such essential parameters in crop production.The study emphasizes on an irrigation system that works adequately in applying water to stay within the root zone,making the water always available in sufficient quantities to meet the crop water needs.It suggests practical ways of managing irrigation systems within tolerable limits not neglecting the effects of wind which is a major contributing factor to non uniformity in sprinkler irrigation. | Ransford Opoku Darko Yuan Shouqi Liu Junping Yan Haofang Zhu Xingye | 2017 | International Journal of Agricultural and Biological Engineering2017，10，2： | 8 |
| 2 | Determination of crop and soil evaporation coefficients for estimating evapotranspiration in a paddy field显示文摘Accurate estimation of evapotranspiration is important in efficient water management for improving water use efficiency.In order to obtain evapotranspiration and evaporation beneath the canopy using the Food and Agriculture Organization(FAO)method,pan evaporation was used instead of reference evapotranspiration calculated by the Penman-Monteith equation with detailed meteorological data.The total crop coefficient and soil evaporation coefficient were determined using actual measured daytime evapotranspiration and evaporation by the Bowen ratio energy balance and lysimeter,respectively,in a rice paddy field in Japan.The average evapotranspiration was 5.3 mm/d,4.4 mm/d,7.4 mm/d and 6.3 mm/d and crop coefficient was 0.79,1.18,1.01 and 0.86 for the initial stage,development stage,middle-season stage and late-season stage,respectively.The evaporation was low and almost constant with an average value around 0.77 mm/d when the leaf area index(LAI)reached 3.The proposed average crop coefficients for different growing stages were applied to estimate daytime evapotranspiration and found suitable.A simple soil water evaporation coefficient model was developed using leaf area index for practical use and it was found that it could accurately estimate evaporation. | Yan Haofang Zhang Chuan Hiroki Oue Peng Guangjie Ransford Opoku Darko | 2017 | International Journal of Agricultural and Biological Engineering2017，10，4： | 2 |
| 3 | Optimization of movable irrigation system and performance assessment of distribution uniformity under varying conditions显示文摘The evaluation of the performance of distribution uniformity by linearly moved irrigation system(LMIS)should consider the impacts of non uniformity of the water on crop yield.With increasing pressures to improve water use efficiency,plant productivity and farm profitability,questions continue to be raised concerning the future direction of irrigated agriculture.This study therefore aimed at evaluating water distribution under LMIS newly designed by the National Research Centre of Fluid Machinery Engineering and Technology,Jiangsu University,China.This article reports the real distribution of irrigation water under the LMIS with respect to sprinkler height above the ground surface as well as the consequence of different operating pressures.Water distribution coefficients used in the performance assessment were Christiansen’s coefficient of uniformity(CU),distribution uniformity(DU),scheduling coefficients(Sc)and the coefficient of variation(CV).The results showed that the mean CU ranged from 82.30%to 93.17%,and mean DU ranged from 70.39%to 88.44%.Also Sc values ranged from 1.13 to 1.42 with CV values ranging from 10.3%to 22.5%.The optimum method and results in this study can provide a reference to the operations for saving water and cost in the application of LMIS. | Yuan Shouqi Ransford Opoku Darko Zhu Xingye Liu Junping Tian Kun | 2017 | International Journal of Agricultural and Biological Engineering2017，10，1： | 2 |
| 4 | Treatment of nonrheumatoid occipitocervical instability internal fixation with the Hartshill-ransford loop显示文摘 | Maloclm GP Ransford AO Crockard HA | 1994 | J Bone Joint Surg(Br)1994，76，5： | 1 |
| 5 | Basilar impression in osteogenesis imperfecta:a report of three cases in one family显示文摘 | Pozo JL Crockard HA Ransford AO | 1984 | J Bone Jt Surg1984，66，2： | 1 |
| 6 | One-stage transoral decompression and posterior fixation in rheumatoid atlanto-axial subluxation显示文摘 | Crockard HA Calder I Ransford AO | 1990 | J Bone Joint Surg1990，72，： | 1 |
| 7 | On the set of discrete two-generator groups显示文摘 | BARIBEAU L RANSFORD T | 2000 | Math Proc Camb Phi Soc2000，128，： | 1 |
| 8 | Renal pelvis rupture in a kidney with ureteropelvic junction obstruction and extrarenal calyces显示文摘 | Ransford G Young E Casteltan M | 2013 | J Pediatr Urol2013，9，3： | 1 |
| 9 | Arole for amines in the antidepressant effect or exercise:a revielcc显示文摘 | Ransford CP | 1982 | Med Sci Sports Exerc1982，4，1： | 1 |
| 10 | Sulphasalazine and mesalazine:serious adverse reactions re-evaluated on the basis of suspected adverse reaction reports to the committee on safety of medicines显示文摘 | Ransford RA Langman MJ | 2002 | Gut2002，51，4： | 1 |
| 11 | Osteoplastic repair of the atlas显示文摘 | Rogers MA Ransford AO | 1992 | J Bone Joint Surg Br1992，74，6： | 1 |
| 12 | One-stage transoral decompression and posterior fixation in rheumatoid atlantoaxial subluxation 显示文摘 | Croekard HA Calder I Ransford AO | 1990 | J Bone Joint Surg Br1990，72，4： | 1 |
| 13 | Osteoplastic repair of the atlas 显示文摘 | Rogers MA Ransford AO Crockard HA | 1992 | J Bone Joint Surg Br1992，74，6： | 1 |
| 14 | Calibration and validation of AquaCrop for deficit and full irrigation of tomato显示文摘The objective of this study was to calibrate and test AquaCrop for tomato(Lycopersicon esculentum)grown under deficit and full irrigation.Two field experiments were carried out in the tropical humid coastal savanna zone in Mfantseman district of the Central Region of Ghana.Data from the first experiment were used to calibrate the model while data obtained from the second experiment were used to validate the model.The calibrated AquaCrop model concentrated on its performance to predict crop yield and seasonal crop water requirement(ETc).Four treatments were investigated:T1(no irrigation after plant establishment),T2(50%ETc restoration),T3(100%ETc restoration up to beginning of flowering,then 50%ETc restoration)and T4(100%ETc restoration).The results revealed that AquaCrop was able to simulate the yield of tomato for T2-T4 with the exception of Treatment T1 which was simulated with the highest deviation of 45.1%.On the other hand,the model was able to simulate the seasonal water requirements to an appreciable degree in both experiments.It must be pointed out that the calibration of AquaCrop suffered from a lack of data on the progress of crop canopy cover which is a very important parameter used in developing the model. | Ransford Opoku Darko Yuan Shouqi Yan Haofang Liu Junping Agnes Abbey | 2016 | International Journal of Agricultural and Biological Engineering2016，9，3： | 1 |
| 15 | Transoral decompression and posterior fusion for rheumatoid atlanto-axial subluxation 显示文摘 | Crockard HA Pozo JL Ransford AO | 1986 | J Bone Joint Surg Br1986，68，3： | 1 |
| 16 | The behaviour pattern of scoliosis associated with osteoid osteoma or osteoblastoma of the spine显示文摘 | Ransford AO Pozo JL Hutton PAN | 1984 | J Bone Joint Surg1984，66，： | 1 |
| 17 | Tran soral decompression and posterior fusion for rheumatoid atlanto axial suhluxation显示文摘 | GROCKARD H A POZO J L RANSFORD A O et aI | 1986 | J Bone Joint Surg (Br)1986，68，： | 1 |
| 18 | Cranioccervical instability treated by contoured loop fixation显示文摘 | RANSFORD A D CROCKARD H A POZO J L | 1986 | J Bone & Joint Surg (Br)1986，68，： | 1 |
| 19 | A role for amines in the antidepressant effect of exercise: a review显示文摘 | RANSFORD CP | 1982 | Med Sci Sports Exerc1982，4，1： | 1 |
| 20 | Transoral decom pres sion and posterior fusion for rheumatoid atlanto axial sublux ation显示文摘 | Pozo JL Ransford AO | 1986 | J Bone Joint Surg(Br)1986，68，： | 1 |
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