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OPTIMUM CONTROL OF IRRIGATION SYSTEM FOR HYDROCULTURE USING BIOMASS BED WITH TWO INPUTS OF TRANSPIRATION AND WATER CONTENTS

蒸腾量和水分两输入生物质床水产养殖灌溉系统的优化控制

基本信息

批准号：
07456113
负责人：
FUJIURA Tateshi
金额：
$ 3.52万
依托单位：
SHIMANE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07456113/
关键词：
Bark of Japanese cedar and cypress Bark bed Irrigation control Transpiration flow rate Thermal conductivity 潅水制御茎蒸散流量水耕ベッドベッド水分給水制御トマト

项目摘要

This study was done to improve and popularize the hydro- cultivation with the compressed bed of Japanese cedar and cypress, and to develop an automatic, irrigation and heating systems for that. Therefore, physical properties, water holding performance, drying characteristic and heat couductivity of the bed were investigated.(1) The essential oil that is contained in the bed interrupts the water absorption. The bed became absorbent of water by flooding in the water. The essential oil that is contained in the bed was considered effective to prevent the rot of the bed.(2) The bed was moistened by flooding into the water. Time required to saturate it with water was 12 hours after flooding it.(3) After moistening, the bed was put n a net to drain the excess water. After five minutes, the apparent volume distribution of solid, liquid and gas phases were 26,28 and 46% respectively. This large ratio of gas phase showed that the gas permeability was high.(4) Cherry tomatoes were planted in the biomass bed, and its growth and the pF value of the bed were measured to investigate optimum control of the irrigation.(5) The response time of the stalk diameter increased with the pF value. The transpiration flow rate decreased with the increasing pF value. It was suggested that the pF value in the irrigated bark bed should be less than 1.6-1.7 for the growth of cherry tomatoes.(6) The thermal conductivity of the biomass bed was about 1/3 of that of the rock wool bed. The low thermal conductivity saves the heating energy of the bed.Consequently, the bark materials of Japanese ceder and cypress were considered suitable for the hydro-cultivation bed.

本研究旨在改进和推广日本雪松、柏木压缩床水培栽培技术，并研制出相应的自动化灌溉供暖系统。为此，对该床的物理性能、保水性能、干燥特性和导热性能进行了研究。(1)床中含有的精油干扰了吸水率。河床因在水中泛滥而变得吸水。床中含有的精油被认为对防止床的腐烂有效。(2)床被注入水中而湿润。用水浸泡所需的时间为浸水后12小时。(3)湿润后，将床放入网中，排干多余的水。5min后，固、液、气相的表观体积分布分别为26%、28%和46%。在生物质床上种植樱桃番茄，通过测定其生长量和床层的PF值，研究灌水的最优控制。(5)秸秆直径的响应时间随PF值的增加而增加。蒸腾速率随Pf值的增大而减小。建议樱桃番茄灌溉树皮床的Pf值应小于1.6-1.7。(6)生物质床的导热系数约为岩棉床的1/3。由于导热系数低，节省了床的加热能量，因此，认为日本雪松和柏树的树皮材料适合于水培床。