Controlling indeterminacy in short season lentil by cultivar choice and nitrogen management

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• 作者：H. Zakeri^a ; R.A. Bueckert^a ; ^{rosalind.bueckert@usask.ca} ; J.J. Schoenau^b ; A. Vandenberg^a ; G.P. Lafond^c
• 关键词：DTM ; days to maturity ; DW ; aboveground biomass ; CDC ; Crop Development Centre ; GD ; Goodale Research Farm ; HI ; harvest index ; %Ndfa ; percentage of nitrogen derived from the atmosphere ; SKA ; Skarsgard farm ; IH ; Indian Head Research Farm
• 刊名：Field Crops Research
• 出版年：2012
• 期刊代码：44_03784290
• 类别：abs
• 出版时间：13 May, 2012
• 卷：131
• 期：Complete
• 页码：1-8
• 文件大小：298 K

摘要

Western Canada is a major area of lentil (Lens culinaris Medik.) production and global export, specializing in short season production. In cool or wet years lentil often fails to mature within the 115-d growing season. In the absence of a determinate cultivar, our goal was to test whether current cultivars could mature earlier and without a yield penalty by managing N fertility practices. Eight cultivars of lentil were grown in Saskatchewan during 2006 and 2007 under three N fertility treatments: 50 kg N ha^鈭?, Rhizobium inoculant, and an uninoculated control. Measurements included days to maturity, yield, aboveground biomass (DW), plant total N content, and N₂ fixation. Lentil yielded 1900 kg ha^鈭?, 2120 kg ha^鈭? and 2070 kg ha^鈭? in control, fertilized, and inoculated treatments, respectively. The N treatments did not affect days to maturity or harvest index (HI). Yield and N₂ fixation were unaffected by the N treatments except in drought, where yield was smallest in the control and N₂ fixation was smallest in the fertilized treatment. Cultivars CDC Milestone, CDC Red Rider and CDC Rouleau had comparable yield and matured earlier than large-seeded cultivars, demonstrating that growing a recently released small-seeded cultivar gave earlier maturity than N fertility management. Results did not demonstrate any advantage from applying N fertilizer to hasten maturity, to increase HI or yield compared to the current practice of relying on N₂ fixation from proper inoculation. Biological N₂ fixation is a sustainable and more economical means of supplying N to the lentil crop without the need to apply N fertilizer, particularly with high yielding early maturing cultivars.