Here, we describe the current status of energy-saving techniques in greenhouse heating and countermeasures for high summer temperatures, and then introduce an outline and the performance of a newly developed New Root-zone Environmental Control System (N.RECS) and the effects of this system on flower production. Temperature control techniques used in protected horticulture include those that control the air temperature of the entire greenhouse space and those that control the local temperature of the plants. The running costs of the air temperature control techniques are expensive and the cooling capacity in the summer are inadequate for actual cultivation. Local temperature control techniques have relatively low running costs and can adequately cool plants during high temperature periods, but they are crop-specific and not versatile. Therefore, we developed a N.RECS that can heat and cool the root-zone of various plants with low running costs. N.RECS was produced by combining aluminum heat exchange panels, insulated pot trays and an air-source heat pump cold/hot water supply system. By using N.RECS, the root-zone temperature was maintained at 25°C when the air temperature was about 5°C during the winter and cooled to below 23°C when the air temperature was about 35°C during the summer. Root-zone heating of six potted flowers and cut flowers in the winter promoted growth and flowering and achieved energy savings of about 30% compared to conventional heating.

When the two flower species, which are susceptible to high temperature, were grown under high temperature conditions, about half of the plants died, but root-zone cooling allowed all the plants to grow healthily. Therefore, it is concluded that N.RECS is a practical system that allows for both energy-saving cultivation in the winter and cooling cultivation in the summer. In addition, root-zone temperature is an environmental control parameter that should be controlled in future agricultural production; by applying root-zone temperature control as a standard technology for agricultural production, the growth of plants can be controlled more flexibly and more energy can be saved.

在这里，我们描述了温室供暖节能技术的现状和夏季高温对策，然后介绍了新开发的新根区环境控制系统（N.RECS）的概要和性能以及其效果。这个系统在花卉生产上。保护园艺中使用的温度控制技术包括控制整个温室空间的空气温度和控制植物局部温度的技术。空气温度控制技术的运行成本昂贵，并且夏季的冷却能力不足以用于实际栽培。局部温度控制技术的运行成本相对较低，可以在高温时期充分冷却植物，但它们是针对特定作物的，用途不广。所以，我们开发了一种 N.RECS，可以以低运行成本加热和冷却各种植物的根区。N.RECS 由铝制热交换板、隔热锅盘和空气源热泵冷/热水供应系统组合而成。通过使用N.RECS，根区温度在冬季5°C左右时保持在25°C，夏季在35°C左右时冷却到23°C以下。冬季对六种盆花和切花进行根区加热，促进生长开花，比传统加热节能30%左右。保温锅盘和空气源热泵冷/热水供应系统。通过使用N.RECS，根区温度在冬季5°C左右时保持在25°C，夏季在35°C左右时冷却到23°C以下。冬季对六种盆花和切花进行根区加热，促进生长开花，比传统加热节能30%左右。保温锅盘和空气源热泵冷/热水供应系统。通过使用N.RECS，根区温度在冬季5°C左右时保持在25°C，夏季在35°C左右时冷却到23°C以下。冬季对 6 种盆花和切花进行根区加热，促进生长和开花，比传统加热节能 30% 左右。

当这两种易受高温影响的花种在高温条件下生长时，约有一半的植物死亡，但根区冷却使所有植物都能健康生长。因此，可以得出结论，N.RECS 是一个实用的系统，既可以在冬季进行节能栽培，又可以在夏季进行降温栽培。此外，根区温度是未来农业生产中应控制的环境控制参数；通过应用根区温度控制作为农业生产的标准技术，可以更灵活地控制植物的生长，更节能。