Han, Jianguo

Li, Pinghong

Ma, Lingfa

Sun, Hongren

Wu, Ruixin

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Water Requirement and Water Requirement Rate of Alfalfa in Bashang Area Hongren Sun China Agricultural University, China Lingfa Ma Gansu Agricultural University, China Jianguo Han China Agricultural University, China Ruixin Wu China Agricultural University, China Pinghong Li China Agricultural University, China Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/1-3/24 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　 瞯 ]123　 瞯Grasslands/Rangelands Resources and Ecology ——— Ecology of Grasslands/RangelandsWater requirement and water requirement rate of alfalfa in Bashang areaSun Hong‐ren１ ,Ma L ing‐f a２ , H an Jian‐guo１ ,W u Rui‐x in１ ,L i Ping‐hong１１ Institute o f G rassland Science ,China A gricultural University , Bei j ing １０００９４ ,China . ２ Pratacultural College , GansuA gricultural University ,L anz hou ７３００７０ ,China .E‐mail :sunhongren＠ cau .edu .cnKey words : alfalfa , water requirement , water requirement rate , Bashang areaIntroduction The research was designed with purpose of revealing the water requirement and water requirement rate of alfalfa( Medicago sativ a L) in Bashang area to provide scientific support for the water management of alfalfa in this area .Materials and methods The large scale non‐weighing lysimeter method ( Cooperation group , １９９３) was used for determining thewater requirement and water requirement rate of Algonqin alfalfa sowed in June , ２００６ with a seeding amount １５ kg / hm２ and arow spacing ３０ cm in Bashang area in ２００７ . The lysimeter was made of mixed cement and bricks , with a capacity of ３ × ２ × １ .６m . Sufficient water was supplied during the experiment period to avoid the alfalfa plants endangered by drought . This processis repeated for three times using three lysimets . The amount of precipitation , irrigation , seepage and water change amount insoil were measured . The formulas for the water change amount in soil , water requirement and water requirement rate are asfollow :　 　 △ W ＝ １０ ∑ γi Hi (θi２‐θi１ ) (１ )⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯　 　 WR ＝ R ＋ I‐P‐ △ W (２ )⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯　 　 WRR ＝ WR/ T (３ )⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯In formula １ to ３ , △ W ,WR ,R ,I and P stand for water change amount in soil , water requirement ,seepage , irrigation andprecipitation with the unit mm , respectively . γi stand for soil bulk density with the unit g/cm３ .θi１ &θi２ stand for the soil watercontent at the beginning and the ending of the calculation time with the unit ％ , respectively .WRR stand for water requirementrate with the unit mm/ d . T stand for time with the unit d .Results and analysis The results were shown in Table １ .Table 1 The water requirement and water requirement rate o f al f al f a in Bashang area .Harvest No . １ 梃２ 哌１ ～ ２ 痧Water requirement( mm) ５０３ 梃.８ １８０ 哌.１ ６８３ *.９Water requirement rate ( mm /d) ７ 汉.８ ３ 北.２ ５ |.６Discussion and conclusion The range of water requirement and water requirement rate of alfalfa around the world is about ４００ －２２５０ mm and ３ － ７ mm/d , respectively ( Sun Hongren , et al , ２００５ ) . Bashang area belongs to the area with low waterrequirement and high water requirement rate .ReferencesCooperation group , ( １９９３ ) . Study on the isogram of main crop water requirement in China . Beijing : China AgriculturalScience and Technology Publisher . ８‐１０ .Sun Hong‐ren , Liu Guo‐rong , Zhang Ying‐jun ,et al , ( ２００５ ) . Water requirement , water consumption , water requirementrate , water consumption rate and water use efficiency of alfalfa . A cta Prataculturae Science , ２２(１２) :２４‐３０ .

Water Requirement and Water Requirement Rate of Alfalfa in Bashang Area

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=2302&amp;context=igc

Water Requirement and Water Requirement Rate of Alfalfa in Bashang Area

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