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首页> 外文期刊>Acta Horticulturae >Reconciling physiological and agronomic effects of irrigation frequency
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Reconciling physiological and agronomic effects of irrigation frequency

机译：协调灌溉频率的生理和农艺效应

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摘要

To investigate the effects of irrigation frequency independently of changes in irrigation volume, container-grown basil or tomato plants were exposed to three different treatments. Well-watered (WW) plants received 100% of the previous day's evapotranspiration (determined gravimetrically) daily. Deficit irrigated (DI) plants received 75% (basil) or 50% (tomato) of the previous day's WW evapotranspiration daily. Plants exposed to drying and re-wetting (DRW) received the same irrigation volume as DI plants, but in single irrigation events applied every 3-6 days. DI and DRW tomato plants had the same shoot biomass, water use efficiency (WUE) and stomatal regulation. In contrast, DI basil plants had greater shoot biomass but lower WUE than DRW plants, which was correlated with maintenance of stomatal conductance in DI plants as the soil dried. Further experiments are needed to determine whether species differences or the severity of deficit irrigation explain these discrepancies, and whether altered stomatal regulation affects whole plant carbon gain. Nevertheless, maintenance of biomass accumulation in DI basil plants suggests that irrigation frequency may be adjusted for commercial benefit.
机译：为了研究灌溉频率的影响，独立于灌溉体积的变化，容器生长的罗勒或番茄植物暴露于三种不同的处理。浇水（WW）植物每天收到前一天蒸散的100％（重热）。缺陷灌溉（DI）植物每天都接受前一天的WW蒸散量的75％（罗勒）或50％（番茄）。暴露于干燥和重新润湿（DRW）的植物接受了与DI植物相同的灌溉体积，但在每3-6天施加一次灌溉事件中。 DI和DRW番茄植物具有相同的拍摄生物质，用水效率（WUE）和气孔调节。相比之下，DI罗勒植物具有比DRW植物更高的射击生物量，但较低的WUE，其与DI植物中的气孔电导的维持相关，因为土壤干燥。需要进一步的实验来确定物种差异是否或缺陷灌溉的严重程度解释了这些差异，以及改变的气孔调节是否会影响全植物碳增益。然而，DI罗勒工厂的生物质积累的维护表明，可以调整灌溉频率以进行商业效益。

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