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首页> 外文期刊>Irrigation Science >Response of alfalfa (Medicago sativa L.) to diurnal and nocturnal saline sprinkler irrigations. II: shoot ion content and yield relationships
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Response of alfalfa (Medicago sativa L.) to diurnal and nocturnal saline sprinkler irrigations. II: shoot ion content and yield relationships

机译：苜蓿（Medicago sativa L.）对白天和夜间盐水喷洒的响应。二：枝条离子含量与产量的关系

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摘要

When using saline waters, sprinkling irrigation at night is a recommended practice to reduce evaporation, salt absorption by the wetted leaves and its negative effects on crops. We measured shoot ion concentrations (Cl−, Na+ and K+) and total dry matter (TDM) in alfalfa subject to diurnal and nocturnal saline sprinkler irrigations and established potential relationships among them. The work was carried out along the 2004–2006 growing seasons using EC waters from 0.5 to 5.6 dS m−1. Saline sprinkling irrigations linearly increased shoot Cl− and Na+ and decreased shoot K+. Even though daytime evaporation was much higher than nigh-time, shoot ion accumulation and TDM were similar in the diurnal and nocturnal irrigations. The salinity tolerance of alfalfa decreased in year 2006 due to increases in shoot Cl− and, particularly, shoot Na+. The lower threshold for shoot Na+ (276 meq kg−1) than for shoot Cl− (726 meq kg−1) shows that alfalfa is more sensitive to Na+ than to Cl−, and that Na+ accumulation is the preponderant cause of alfalfa yield decline after 3 years of sprinkling with saline waters.
机译：当使用盐水时，建议在夜间洒水以减少蒸发，湿叶吸收盐分及其对农作物的不利影响。我们测量了苜蓿在白天和夜间都会受精的离子浓度（Cl -，Na + 和K + ）和总干物质（TDM）。盐雾喷灌，并建立了它们之间的潜在关系。这项工作是在2004-2006年生长季节期间使用0.5至5.6 dS m -1 的EC水进行的。盐雾灌溉线性增加枝条Cl -和Na + ，减少枝条K + 。尽管白天的蒸发量远高于夜间，但在昼夜灌溉中，枝条离子积累和TDM却相似。苜蓿的耐盐性在2006年下降，这是由于Cl -枝条，特别是Na + 枝条的增加所致。芽Na + （276 meq kg −1 ）的阈值比芽Cl -（726 meq kg -1 ）表明苜蓿对Na + 的敏感性高于对Cl -的敏感性，并且Na + 积累是苜蓿的主要原因撒盐水3年后产量下降。

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