Sesame response to nitrogen management under contrasting water availabilities  

作　　者：Elnatan Golan Zvi Peleg Zipora Tietel Ran Erel 

机构地区：[1]Gilat Research Center,Agricultural Research Organization,Israel [2]The Robert H.Smith Faculty of Agriculture,Food and Environment,The Hebrew University of Jerusalem,Israel

出　　处：《Oil Crop Science》2022年第4期166-173,共8页中国油料作物学报(英文版）

基　　金：supported by the CFPN fund (Center of Fertilization and Plant Nutrition, grant number ICLF20161)。

摘　　要：Sesame is mainly cultivated under traditional,low-input agro-systems.Recent breeding developments promoted the modernization and mechanization of sesame cultivation.However,only a few articles have been published concerning fertilization requirements for both modern and traditional agro-systems.In field trials at two locations,we determined the response of irrigated sesame to nitrogen(N).Three promising sesame lines were tested combining two irrigation levels with four N levels.At a high irrigation level,N had a significant effect on growth,branching,and consequently,seed yield exceeding two-ton ha^(-1).A high N doze was accompanied by a decrease in the photosynthetic rate and leaf water potential.The δ^(13)C confirmed lower stomatal conductance under high N treatments.Under deficit irrigation,the N level had a minor effect on the monitored parameters,indicating N fertilization was not efficient.Seed oil content was negatively correlated with seed N concentration.Our results question the necessity of N application when water is limited,as N fertilization promotes vigorous development that rapidly depletes soil water.Thus,water availability should be considered when developing an N management strategy.For high-yielding agro-systems,roughly 80–120 kg ha^(-1)N is required for optimal yield,bearing in mind the negative association between seed-N and oil content.

关 键 词：Nitrogen-use efficiency Seed-oil IRRIGATION FERTIGATION 

分 类 号：S565.3[农业科学—作物学]