共查询到20条相似文献，搜索用时 15 毫秒
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《Plant Production Science》2013,16(1):28-35
AbstractThe Leaf Water Relations, Photosynthetic Parameters and Shoot Growth of Five Snap Bean Cultivars Were Assessed During The Drought Period To Determine Their Role In Alleviating Plant Water Deficit Imposed By Withholding Irrigation At Flowering. Soil Water Content of Irrigated Plants Was 18-20% While That of Unirrigated Plants Was 6-10% At 60 Days After Seeding (Das). Leaf Water Potential Was Approximately 0.15Mpa Lower and Relative Water Content Was Approximately 5% Lower In Unirrigated Plants Than In Irrigated Plants At 57 Das. Unirrigated Plants Had A Lower Stomatal Conductance (Gs) and Intercellular Co2 Concentration (Ci). Reduced Leaf Water Potential and Relative Water Content Were Associated With A Decreased Stem Elongation Rate. Plants With A Lower Stem Elongation Rate Had A Higher Specific Leaf Weight and Succulence Index (Suci). Significant Differences Among Five Cultivars of Snap Bean Were Found For All Parameters Measured. Decreased Leaf Water Potential and Stem Elongation Rate Resulting From Drought Participated In Preserving Relative Water Content and Improving Specific Leaf Weight and Suci. Maintenance of Higher Relative Water Content Increased Gs and Ci. Cultivars That Maintained A High Relative Water Content When Leaf Water Potential and Stem Elongation Rate Were Decreased Markedly, Were More Tolerant To Drought Than Those Which A Reduced Relative Water Content and The Leaf Water Potential and Stem Elongation Rate Were Only Slightly Lowered. Reduced Yield (Pods Per Plant and Seed Biomass) Resulting From Drought Was Associated With Reduced Relative Water Content. 相似文献
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《Plant Production Science》2013,16(1):20-27
AbstractSeasonal Wetlands, Locally Called Oshanas, Are Characteristic of The Densely Populated Northern Namibia, A Desert Country in Southwest Africa. The Formation of Seasonal Wetlands, Which Will Sustain The Water Balance of A Semiarid Environment, Was Quite Unstable Depending Entirely On The Variable Rainfall in The Upper Catchments of Angola. The Objective of The Present Study Was To Evaluate The Use of Seasonal Wetland Water By Pearl Millet, The Local Staple Food Crop intercropped With Cowpea, To Discuss The Water Competition Pattern of intercropped Species. Root System Development of The intercropped Species Was Also Evaluated Together With The Water Source Analysis. For This Purpose, Field Experiments Using Pearl Millet intercropped With Cowpea in The Seasonal Wetland in Namibia University (Exp. 1) and Monocropped Pearl Millet in The Local Farmers Field (Exp. 2) Were Conducted in Northern Namibia. Both Pearl Millet and Cowpea Developed Deeper Root Systems As The Distance From The Seasonal Wetland Water increased. At Flowering Time, The δD Value of intercropped Cowpea Was Similar To That of Wetland Water, While That in Pearl Millet Was Much Lower Than Those of Both The Wetland Water and Groundwater. This indicated That intercropped Pearl Millet Did Not Have Full Access To The Wetland Water When There Was Competition With Cowpea For Water Derived From Various Water Sources. Under Such Circumstances, intercropped Pearl Millet Probably Relies More On The Rainfall Water, Which Is Just Sufficient To Sustain Its Growth in A Semiarid Environment. By Contrast, intercropped Cowpea Wins in The Competition With Pearl Millet and Can Acquire Water From The Existing Stored Wetland Water. 相似文献
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Kim Saet Byul Shin Hyung Jin Park Minji Kim Seong Joon 《Paddy and Water Environment》2015,13(4):557-569
Paddy and Water Environment - The Soil and Water Assessment Tool model was applied to assess the potential climate change impact on snowmelt and the non-point source pollution discharges in a... 相似文献
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Katigari Maryam Shakouri Shabanpour Mahmoud Davatgar Naser Vazifehdoust Majid 《Paddy and Water Environment》2022,20(2):265-276
Paddy and Water Environment - Plant Available Water is the main concept for describing the existing water content in a soil profile. Along with this concept, Integral Energy shows the energy... 相似文献
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Paddy and Water Environment - The purpose of this paper is to build a drought early warning system for Jinghuiqu Irrigation Area in China. In former research, the authors (Huang and Yuan Water... 相似文献
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Takada Asari Hiramatsu Kazuaki Trieu Ngoc Anh Harada Masayoshi Tabata Toshinori 《Paddy and Water Environment》2019,17(2):195-202
Paddy and Water Environment - Water scarcity and flooding constitute major problems for developing countries located within the tropical climatic region of Southeast Asia. In addition, regional... 相似文献
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Issanova Gulnura Jilili Reyisha Abuduwaili Jilili Kaldybayev Azamat Saparov Galymzhan Yongxiao Ge 《Paddy and Water Environment》2018,16(1):183-191
Paddy and Water Environment - Water is one of the most important natural resources. The water availability and scarcity depend on various natural and anthropogenic factors. Based on generalization... 相似文献
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Taiwan is a small island located in monsoon Asia with an annual precipitation exceeding 2,500 mm, which is 2.6 times the world average. However, water available for each person in Taiwan is less than one seventh of the world average due to Taiwan's crowded population and river basin characteristics. Steep land slope and uneven time and space distribution of rainfall have caused water resources problems. Providing a pure and plentiful supply of water for the people challenges the Water Resources Agency in Taiwan. History is a powerful tool for portraying the future. This paper discusses major themes in the review of water resources development over the last centuries. The changes in social-economic development, water resources infrastructure and demands of water are central to the discussion, with an eye to the plentiful and sustainable implications of water resources management in Taiwan. The water policy in the twenty-first century is also outlined.Dr. Hwang is the Advice of the Council for Economic Planning and Development (CEPD), Ministry of Economic Affairs (MOEA), Taiwan, Chairman of the Water Resources Committee, Chinese Institute of Civil and Hydraulic Engineering, a board member of the International Commission on Irrigation and Drainage (ICID) Chinese Taipei Committee, former chairman of the Chinese Society of Agriculture Engineering (CSAE), former director of Water Resources Agency (WRA), former director of the Taiwan Provincial Water Conservancy Agency (TPWCA), and former director of the Taiwan Provincial Water Conservancy Bureau (TPWCB). 相似文献
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Ebadi Arash Raja Omid Ebrahimian Hamed Yazdani Mohammad Reza Rezaverdinejad Vahid 《Paddy and Water Environment》2022,20(1):151-151
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Sarvestani ZT Pirdashti H Sanavy SA Balouchi H 《Pakistan journal of biological sciences: PJBS》2008,11(10):1303-1309
A field experiment was conducted during 2001-2003 to evaluate the effect of water stress on the yield and yield components of four rice cultivars commonly grown in Mazandaran province, Iran. In northern Iran irrigated lowland rice usually experiences water deficit during the growing season include of land preparation time, planting, tillering stage, flowering and grain filing period. Recently drought affected 20 of 28 provinces in Iran; with the southeastern, central and eastern parts of the country being most severely affected. The local and improved cultivars used were Tarom, Khazar, Fajr and Nemat. The different water stress conditions were water stress during vegetative, flowering and grain filling stages and well watered was the control. Water stress at vegetative stage significantly reduced plant height of all cultivars. Water stress at flowering stage had a greater grain yield reduction than water stress at other times. The reduction of grain yield largely resulted from the reduction in fertile panicle and filled grain percentage. Water deficit during vegetative, flowering and grain filling stages reduced mean grain yield by 21, 50 and 21% on average in comparison to control respectively. The yield advantage of two semidwarf varieties, Fajr and Nemat, were not maintained under drought stress. Total biomass, harvest index, plant height, filled grain, unfilled grain and 1000 grain weight were reduced under water stress in all cultivars. Water stress at vegetative stage effectively reduced total biomass due to decrease of photosynthesis rate and dry matter accumulation. 相似文献
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Paddy and Water Environment - A low-cost subsurface irrigation system with ring-shaped emitters has been applied and considered as a way to improve water irrigation efficiency in a region where... 相似文献
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Cho Gun-Ho Ahmad Mirza Junaid Lee Seulgi Choi Kyung-Sook Nam Won-Ho Kwon Hyung-Joong 《Paddy and Water Environment》2019,17(3):359-371
Paddy and Water Environment - Technological and socioeconomic interventions accompanied by climate warming strongly dictate farming practices, lending a direct impact over future irrigation water... 相似文献
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Paddy and Water Environment - To develop more efficient irrigation technologies and a reasonable and convenient irrigation scheduling for winter wheat production in the North China Plain (NCP), a... 相似文献
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Paddy and Water Environment - Evapotranspiration is a key parameter in agricultural water planning and management strategies because it determines the crop and irrigation water requirements. With... 相似文献