Cos lettuce growth under pulsed light generated with full-wave rectification of 50 Hz sine-wave alternating-current power

IF 1.4 4区农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY

Journal of Agricultural Meteorology Pub Date : 2024-03-24 DOI:10.2480/agrmet.d-23-00028

Tomohiro JISHI, Kyohei NISHINO, Ryo MATSUDA, Akira YANO, Kazuhiro FUJIWARA

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Abstract

　To drive LEDs for plant cultivation using an alternating-current (AC) power supply, full-wave rectification (FWR) is a reasonable method to supply a unidirectional forward current to LEDs because of the simple configuration and low energy loss of the rectification circuit. We grew cos lettuce hydroponically using a white LED light source that emitted continuous light, 100 Hz square-wave (SW) pulsed light, or pulsed light generated with FWR of 50 Hz sine-wave AC with the same averaged photosynthetic photon flux density of 150 µmol m^-2 s^-1. The results showed that shoot fresh weight, shoot dry weight, leaf area, and number of leaves did not differ significantly among the treatments. Plants grown under FWR pulsed light showed similar net photosynthetic rates under continuous light and SW pulsed light. Shoot fresh weight per power consumption was estimated to be significantly greater with FWR pulsed light than with continuous light, and we concluded that the use of FWR pulsed light without elaborated transformation to a flat waveform direct current is a promising lighting method to reduce the lighting cost.

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莴苣在 50 赫兹正弦波交流电全波整流产生的脉冲光下生长

在使用交流电源驱动 LED 进行植物栽培时，全波整流 (FWR) 是为 LED 提供单向正向电流的合理方法，因为整流电路配置简单，能量损耗低。我们使用白光 LED 光源水培莴苣，该光源可发出连续光、100 赫兹方波（SW）脉冲光或 50 赫兹正弦波交流全波整流产生的脉冲光，平均光合光通量密度为 150 µmol m-2 s-1。结果表明，不同处理间的嫩枝鲜重、嫩枝干重、叶面积和叶片数没有显著差异。在 FWR 脉冲光下生长的植物在连续光和 SW 脉冲光下表现出相似的净光合速率。据估计，FWR 脉冲光下的单位耗电量的嫩枝鲜重明显高于连续光下的单位耗电量的嫩枝鲜重，因此我们得出结论认为，使用 FWR 脉冲光而不对平波直流电进行精心转换，是一种很有前途的降低照明成本的照明方法。

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来源期刊

Journal of Agricultural Meteorology AGRICULTURE, MULTIDISCIPLINARYMETEOROLOGY-METEOROLOGY & ATMOSPHERIC SCIENCES

CiteScore

2.70

自引率

7.70%

发文量

期刊介绍： For over 70 years, the Journal of Agricultural Meteorology has published original papers and review articles on the science of physical and biological processes in natural and managed ecosystems. Published topics include, but are not limited to, weather disasters, local climate, micrometeorology, climate change, soil environment, plant phenology, plant response to environmental change, crop growth and yield prediction, instrumentation, and environmental control across a wide range of managed ecosystems, from open fields to greenhouses and plant factories.