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Cultivation of spinach in hot seasons using a micro-mist-based temperature-control system
Scientia Horticulturae ( IF 4.3 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.scienta.2020.109603
Choyo Tai , Yuji Sawada , Junichi Masuda , Hiroyuki Daimon , Yoichiro Fukao

Abstract Recent trends in global warming have restricted the cropping periods in Japan, as ambient temperature during summer often rises above 35 °C and concomitantly, the air temperature inside a greenhouse can reach up to 50 °C. In this study, we investigated a strategy for reducing heat stress for sustainable greenhouse cultivation of spinach. Generally, this species is not cultivated during hot seasons due to heat-induced inhibition of growth. We compared the growth of spinach with and without a micro-mist system that produced mist with an average particle size of 10 μm. Our system effectively reduced the temperature in the greenhouse by as much as 4.3 °C through the evaporation of mist. Additionally, when temperature in the control area peaked at 37.4 °C, the temperature in the micro-mist area was 3.7 °C lower. Furthermore, average soil temperature decreased maximum average soil-temperature by 0.7 °C and average daily humidity was approximately 5 % higher. Consequently, crop yield increased by 30 %. Finally, spinach mineral content with/without micro-mist in the hot season did not differ from that measured in spinach grown conventionally, while spinach grown in the hot season with the micro-mist system had 1.4-fold greater lutein content than spinach grown conventionally. Altogether, our results demonstrate that spinach can be cultivated even during hot seasons in greenhouses equipped with a micro-mist system, without any significant decrease in mineral or lutein content.

中文翻译:

使用基于微雾的温度控制系统在炎热季节栽培菠菜

摘要 近期全球变暖趋势限制了日本的种植期,夏季环境温度经常上升到 35 °C 以上,同时温室内的气温可高达 50 °C。在这项研究中,我们调查了一种减少热应激的策略,以实现菠菜的可持续温室栽培。通常,由于热诱导的生长抑制,该物种在炎热季节不种植。我们比较了菠菜在使用和不使用产生平均粒径为 10 μm 的雾的微雾系统的情况下的生长情况。我们的系统通过雾气的蒸发,有效地将温室内的温度降低了 4.3 °C。此外,当控制区的温度达到 37.4°C 时,微雾区的温度降低了 3.7°C。此外,平均土壤温度将最大平均土壤温度降低了 0.7 °C,而平均日湿度则高出约 5%。因此,作物产量增加了 30%。最后,在炎热季节有/没有微雾的菠菜矿物质含量与传统种植的菠菜的测量结果没有差异,而在炎热季节种植的微雾系统菠菜的叶黄素含量比常规种植的菠菜高 1.4 倍. 总而言之,我们的结果表明,即使在炎热季节,菠菜也可以在配备微雾系统的温室中种植,而矿物质或叶黄素含量不会显着降低。炎热季节有/无微雾的菠菜矿物质含量与传统种植的菠菜的测量结果没有差异,而在炎热季节种植的微雾系统菠菜的叶黄素含量比常规种植的菠菜高 1.4 倍。总而言之,我们的结果表明,即使在炎热季节,菠菜也可以在配备微雾系统的温室中种植,而矿物质或叶黄素含量不会显着降低。炎热季节有/无微雾的菠菜矿物质含量与传统种植的菠菜的测量结果没有差异,而在炎热季节种植的微雾系统菠菜的叶黄素含量比常规种植的菠菜高 1.4 倍。总而言之,我们的结果表明,即使在炎热季节,菠菜也可以在配备微雾系统的温室中种植,而矿物质或叶黄素含量不会显着降低。
更新日期:2020-11-01
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