Closed and recycling syslematization on hydroponics

我们尝试用树皮培养基“bark de Green”作为有机培养基代替岩棉，并设计了植物根区环境控制系统，以培养养分水的循环和再利用为目标。将杉木和柏木树皮按粒径大小分为10 mm以下和10 mm以上2类，按树皮粒径混合率分为6类。测定了树皮培养基的3个相分布、密度和含水量的物理性质。对番茄和小松进行了毛细管灌溉系统的培养。随着树皮在1 mm以下比例的增加，固相和液相增加，气相减少。与岩棉相比，液相较低，且从pF 1.0开始随着pF值的增大而减小。而当粒径小于1 mm的比例大于80%时，在pF≤0.9时，树皮与岩棉的液相基本一致。树皮培养基的持水性能低于岩浆液。在番茄栽培中，1 mm以下树皮比例在80%及以下的树皮培养基与岩棉培养基的生长无明显差异。因此，这些大小的树皮在西红柿生长中就像岩棉一样有用。在小松栽培中，其生长良好的部位是树皮大小在1 mm以下，岩棉在培养基高度20 cm处。当树皮尺寸大于1 mm时，早期生长较低。3 .在10 cm高度的市场培养基中，未进行粒度分选的树皮液气相平衡良好，表明小松生长稳定。在使用有机培养基的小松栽培中，毛细灌溉系统的生长效果优于滴灌系统，证明了这种简单、廉价的灌溉系统具有较高的实用性。

We tried to use the bark culture medium called as "Bark de Green" as the organic culture medium in place of the rockwool, and designed control system of root area environment of plant, which aimed at the circulation and re-use of cultivating nutrient water.The bark consisted of Japan ceder and Japanese cypress was divided to 2 classes of under 10 mm and over 10 mm by size, and 6 categories were made by the mixing rate of the bark size. The physical properties of bark culture medium were measured on 3 phase distributions, density, and water content. Also tomato and komatsuna were cultured in capillary watering system.1. As the ratio of bark under 1 mm increased, solid phase and liquid phase increased, and then gas phase decreased. As compared with rockwool, the liquid phase was low, and decreased as pF value was higher from pF 1.0. But the bark had as same liquid phase as rockwool below pF 0.9 when the ratio of size under 1 mm was more than 80 %. Water holding performance of bark culture medium was lower than that of rockwool.2. In tomato culture, there ware no obvious differences in growth between the bark culture medium with 80 % or under of ratio of bark under 1 mm and rockwool. Therefore the bark with those sizes was as useful as rockwool in growth of tomatoes.3. In komatsuna culture, its growth was good at the bark with the size under 1 mm and rockwool at 20 cm height of culture medium. Early growth was lower at the bark size over 1 mm. At the 10 cm height of culture medium bark on the market without size sorting was good balance between liquid and gas phases, and indicated stable growth of komatsuna.4. The capillary watering system showed the better growth than drip irrigation system at komatsuna culture using organic culture medium, and proved to have high practical use for simple and cheap watering system.