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Chickpea and faba bean nitrogen fixation in a Mediterranean rainfed Vertisol: Effect of the tillage system

机译:鹰嘴豆和蚕豆固氮在地中海雨养Vertisol中:耕作制度的影响

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Efficient management of legumes in order to maximize benefits depends on a correct field assessment of N-2 fixation. A field experiment was conducted during a 6-year period (2001-2002 to 2006-2007) in Cordoba (Southern Spain) on a rainfed Vertisol within the wheat-chickpea and wheat-faba bean rotation framework of a long-term experiment started in 1986. The aim was to determine the effect of tillage systems [no tillage (NT) and conventional tillage (CT)] on chickpea and faba bean N-2 fixation. Fixation was calculated using the N-15 isotopic dilution (ID) and N-15 natural abundance (NA) methods with the reference being the wheat crop. The strong inter-annual rain variation caused great differences in the behaviour of both leguminous plants with regard to grain yield, nodule biomass and N-2 fixation. The NT system showed more nodule biomass than the CT system in both legumes. The ID method was more accurate than the NA method in determining N-2 fixation. The average amount of fixed N in faba bean (80 kg ha(-1) year(-1)) was much greater than that in chickpea (31 kg ha(-1) year(-1)). The Vertisol under the NT system offered more favourable conditions for the stimulation of the N-2 fixation, with fixed N values that were significantly higher than under CT. The N added to the system through N-2 fixation was low in faba bean and virtually nonexistent in chickpea, only in terms of above-ground biomass
机译:为了使利益最大化,对豆类的有效管理取决于对N-2固定的正确现场评估。在为期6年(2001-2002年至2006-2007年)的科尔多瓦(西班牙南部)地区,对小麦鹰嘴豆和小麦-豆角豆轮作框架内的雨养Vertisol进行了田间试验,该长期试验始于1986年。目的是确定耕作制度对鹰嘴豆和蚕豆N-2固定的影响[不耕作(NT)和常规耕作(CT)]。使用N-15同位素稀释(ID)和N-15自然丰度(NA)方法(以小麦作物为参考)计算固色率。年度强降雨变化导致两种豆科植物在谷物产量,根瘤生物量和N-2固着方面的行为差异很大。在两个豆科植物中,NT系统显示出比CT系统更多的根瘤生物量。在确定N-2固定方面,ID方法​​比NA方法更准确。蚕豆(80千克公顷(-1)年(-1))中固定氮的平均含量远高于鹰嘴豆(31千克公顷(-1)年(-1))。 NT系统下的Vertisol为刺激N-2固定提供了更有利的条件,其固定N值明显高于CT。通过N-2固定作用添加到系统中的N在蚕豆中很低,而在鹰嘴豆中几乎不存在,仅就地上生物量而言

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