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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. I: total dry matter and hay quality
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Response of alfalfa (Medicago sativa L.) to diurnal and nocturnal saline sprinkler irrigations. I: total dry matter and hay quality

机译：苜蓿（苜蓿（Medicago sativa L.））对夜间和夜间盐水喷灌的响应。 I：总干物质和干草质量

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Little information is available on the quantitative effects on crops of saline sprinkler irrigations and the presumable beneficial effects of nocturnal versus diurnal irrigations. We measured crude protein content, carbon isotope discrimination and total dry matter (TDM) of alfalfa (Medicago sativa L.) subject to diurnal and nocturnal saline sprinkler irrigations. The work was carried out in Zaragoza (Spain) during the 2004-2006 growing seasons with a triple line source sprinkler system using synthetic saline waters dominated by NaCl with an irrigation water EC ranging from 0.5 to 5.6dSm super(-1). The quality of alfalfa hay assessed through its crude protein concentration was not significantly affected by salinity. Carbon isotope discrimination, an indicator of the effect of osmotic stress on plant water status, tended to decrease with increases in salinity. Based on a piecewise linear response model, alfalfa grown under saline sprinkler irrigation was shown to be more tolerant (threshold soil salinity, EC sub(e)=3.5dSm[s uperscript]-1 than in previous experiments under surface irrigation (threshold EC sub(e)=2.0dSm[s uperscript]-1 at relatively low salinity values, but became more sensitive at higher salinity values as shown by the higher absolute slope (13.4%) for sprinkler as compared to surface irrigation (7.3%). No significant differences in TDM were found between diurnal and nocturnal saline sprinkler irrigations. The recommended practice of irrigating at night for sprinkler irrigation using saline water is therefore not supported by our results in alfalfa grown under semiarid conditions.
机译：关于盐雾灌溉对作物的定量影响以及夜间灌溉与昼夜灌溉可能产生的有益影响的信息很少。我们测量了苜蓿（苜蓿（Medicago sativa L.））的粗蛋白含量，碳同位素分辨力和总干物质（TDM），该苜蓿每天进行夜间和夜间盐水洒水灌溉。这项工作是在西班牙萨拉戈萨（2004-2006年）生长季节期间进行的，采用三线源洒水系统，该系统使用了以NaCl为主的合成盐水和0.5至5.6dSm super（-1）的灌溉水EC。通过其粗蛋白浓度评估的苜蓿干草的质量不受盐度的显着影响。碳同位素歧视是渗透胁迫对植物水分状况影响的指标，随着盐度的增加趋向于降低。根据分段线性响应模型，盐雾灌溉下生长的紫花苜蓿显示出比以前的地面灌溉条件下更宽容（阈值土壤盐度，EC sub（e）= 3.5dSm [上标] -1） （e）= 2.0dSm [s上标] -1在相对较低的盐度值下，但在较高盐度值下变得更敏感，如与地面灌溉（7.3％）相比，喷头的绝对斜率更高（13.4％）。在夜间和夜间盐雾喷灌之间，TDM存在显着差异，因此，我们在半干旱条件下种植苜蓿的结果不支持夜间使用盐水喷灌的推荐做法。

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