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Photosynthesis, growth, and water use of Hydrangea paniculata ‘Silver Dollar’ using a physiological-based or a substrate physical properties-based irrigation schedule and a biochar substrate amendment
Irrigation Science ( IF 3.1 ) Pub Date : 2020-03-07 , DOI: 10.1007/s00271-020-00670-7
Nastaran Basiri Jahromi , Amy Fulcher , Forbes Walker , James Altland

Developing management practices that make more efficient use of irrigation is important for improving the sustainability of nursery crop production. Integrating refined irrigation scheduling with a substrate amendment like biochar can improve irrigation efficiency. The objective of this research was to evaluate the impact of biochar and need-based irrigation scheduling on gas exchange, plant water relations, and biomass gain of container-grown Hydrangea paniculata ‘Silver Dollar’ with the goal of reducing water use and maintaining or shortening production cycles. Containers were filled with pine bark and amended with either 10% or 25% by volume of hardwood biochar. Plants were automatically irrigated by one of the three irrigation schedules. The irrigation schedules were conventional irrigation, delivering 1.8 cm of water in one event each day, and two on-demand, need-based irrigation schedules. The first was based on the moisture characteristic curve for each of the three substrates developed via the evaporative method. The second was a plant physiology-based irrigation scheduling regime built on the relationship between photosynthesis and substrate moisture content. Scheduling irrigation using a plant physiology or substrate physical properties basis, in combination with biochar, reduced the water requirement for ‘Silver Dollar’ hydrangea without any negative effect on plant dry weight by maintaining sufficient plant water status and gas exchange even just prior to irrigation. Automated irrigation systems coupled with a plant physiology or substrate-based actuation and a water retentive substrate amendment have the potential to reduce nursery crops water use.

中文翻译:

使用基于生理或基质物理特性的灌溉计划和生物炭基质改良剂对绣球花“银元”进行光合作用、生长和用水

制定更有效地利用灌溉的管理实践对于提高苗圃作物生产的可持续性很重要。将精细灌溉计划与生物炭等基质改良剂相结合可以提高灌溉效率。本研究的目的是评估 biochar 和基于需求的灌溉计划对气体交换、植物水分关系和容器种植绣球花“银元”生物量增益的影响,目标是减少用水量并维持或缩短生产周期。用松树皮填充容器并用 10% 或 25% 体积的硬木生物炭进行修正。植物由三种灌溉计划之一自动灌溉。灌溉计划是常规灌溉,每天在一个事件中输送 1.8 厘米的水,和两个按需、基于需求的灌溉计划。第一个是基于通过蒸发方法开发的三种基材中每一种的水分特性曲线。第二个是基于光合作用和基质水分含量之间关系的基于植物生理学的灌溉调度制度。使用植物生理学或基质物理特性的基础安排灌溉,结合 biochar,通过保持足够的植物水分状态和气体交换,甚至在灌溉之前,减少了“银元”绣球花的需水量,而不会对植物干重产生任何负面影响。自动灌溉系统与植物生理学或基于基质的驱动和保水基质改良相结合,有可能减少苗圃作物的用水量。基于需求的灌溉计划。第一个是基于通过蒸发方法开发的三种基材中每一种的水分特性曲线。第二个是基于光合作用和基质水分含量之间关系的基于植物生理学的灌溉调度制度。使用植物生理学或基质物理特性的基础安排灌溉,结合 biochar,通过保持足够的植物水分状态和气体交换,甚至在灌溉之前,减少了“银元”绣球花的需水量,而不会对植物干重产生任何负面影响。自动灌溉系统与植物生理学或基于基质的驱动和保水基质改良相结合,有可能减少苗圃作物的用水量。基于需求的灌溉计划。第一个是基于通过蒸发方法开发的三种基材中每一种的水分特性曲线。第二个是基于光合作用和基质水分含量之间关系的基于植物生理学的灌溉调度制度。使用植物生理学或基质物理特性的基础安排灌溉,结合 biochar,通过保持足够的植物水分状态和气体交换,甚至在灌溉之前,减少了“银元”绣球花的需水量,而不会对植物干重产生任何负面影响。自动灌溉系统与植物生理学或基于基质的驱动和保水基质改良相结合,有可能减少苗圃作物的用水量。第一个是基于通过蒸发方法开发的三种基材中每一种的水分特性曲线。第二个是基于光合作用和基质水分含量之间关系的基于植物生理学的灌溉调度制度。使用植物生理学或基质物理特性的基础安排灌溉,结合 biochar,通过保持足够的植物水分状态和气体交换,甚至在灌溉之前,减少了“银元”绣球花的需水量,而不会对植物干重产生任何负面影响。自动灌溉系统与植物生理学或基于基质的驱动和保水基质改良相结合,有可能减少苗圃作物的用水量。第一个是基于通过蒸发方法开发的三种基材中每一种的水分特性曲线。第二个是基于光合作用和基质水分含量之间关系的基于植物生理学的灌溉调度制度。使用植物生理学或基质物理特性的基础安排灌溉,结合 biochar,通过保持足够的植物水分状态和气体交换,甚至在灌溉之前,减少了“银元”绣球花的需水量,而不会对植物干重产生任何负面影响。自动灌溉系统与植物生理学或基于基质的驱动和保水基质改良相结合,有可能减少苗圃作物的用水量。
更新日期:2020-03-07
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