Water retention parameters of soilless-culture substrates

被引：0
|
作者：
机构：
[1] College of Resources and Environment, Southwest China University
[2] Beijing Hydraulic Research Institute
来源：
Gan, L. (forrestgump2000@126.com) | 1600年 / Chinese Society of Agricultural Machinery卷 / 44期
关键词：
Horizontal diffusivity; Permeability coefficient; Porosity; Soilless-culture; Substrate; Water retention curve;
D O I：
10.6041/j.issn.1000-1298.2013.05.021
中图分类号：
学科分类号：
摘要：
Eight kinds of substrates were used in the experiment of the soilless culture. The water retention parameters, such as porosity, coefficient of permeability, water retention curve and diffusivity were measured. It was obtained that water diffusivity and water content of substrates conformed to empirical formula D(θ)=aebθ and showed the variability of exponential function and high correlation coefficient. The perlite and vermiculite had high speed of water supply, but low water retaining capacity and irrigation efficiency. The total porosity of other six substrates except for perlite and vermiculite varied from 70% to 90%, and their water-air ratios were between 2.0-4.0. Therefore, they could be used as seedling and culture substrates. Based on the comprehensive matrix analysis, the result showed that the optimal ratio of peat and perlite was 2:1, and that of peat, vermiculite and perlite was 3:1:1.
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页码：113 / 118+142
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