Research about global sustainable soilless curture in the open field conditions using small-planet greenhouse

这项研究项目于1998年至2000年进行，目的是开发适用于各种斜坡和地理条件的简化无土栽培体系和种植软件，以及节肥和节水等可持续农业。当时建造了全敞篷温室(Cabrio型)，用于用微型计算机控制多种环境条件。首先，我们研究了温室内的温度分布和太阳辐射，以及遮阳帘对高温控制的影响。结果是，温室内温度基本均匀，但太阳辐射变化较大，遮阳帘促进了温度的升高。我们还研究了几种底物的物理化学性质。结果表明，这些有机基质可以替代岩棉。作为初步试验，我们研究了基质体积和组成对露地栽培番茄生长和产量的影响。西红柿和生菜在模拟的热带条件下种植，并建立了使用本土基质的种植系统。根据这些结果，我们对基于太阳综合辐射的养分调控系统进行了实验，认为该系统是环境友好的。通过这些研究，有必要从植物的生长阶段和环境条件对水分和肥料的吸收进行进一步的研究。

This research project was carried out from 1998 to 2000 for the purpose of developing simplified soilless culture systems and growing softwares adapted to a wide range of clim atic and geographical conditions, and sustainable agriculture such as saving fertilizer and water. At that time, full open-roof greenhouses (Cabrio type) were built for controlling several environmental conditions with micro-computers. At first, we investigated the distribution of temperature and solar radiation, and effect of a shade-curtain on high temperature control in these greenhouses. As a result, temperature was almost uniform, but solar radiation varied widely inside the greenhouse, and the shade-curtain enhanced temperature build-up. Also we investigated the physico-chemical properties of several substrates. Results indicated that these organic substrates could replace rockwool. As a preliminary examination, we investigated the effect of substrate volume, and composition on the growth and yield of tomato grown in the open field. Tomato and lettuce were grown on simylated tropical conditions, and established a growing systems using indigenous substrates. From these results, we experimated the nutrients control system based on integrated solar radiation, and recognized that the system is environment-friendly.Through these researches, it is necesary to make further investigation on the absorption of water and fertilizer with respect to plant's growth stage and environmental conditions.