珍珠岩是一种无土栽植兰花的好基质。用它栽植兰花,能使兰花根系发达,生长旺盛,极少发生烂根现象。珍珠岩质轻而松软,无污染,无病虫害嫌疑,酸碱度适中,兰根生长无阻力。根系多直立下伸,色白健壮;兰叶浓绿茂盛,开花良好。珍珠岩含水量适中,滤水性较强,在有底孔的花盆中绝无积水现象;又因其散水性缓慢,就是到了该浇水时忘了浇水,也不会过分干燥。所以无论干、湿,都不会伤根、伤苗,更不会出现因基质过干而导致的兰苗生长受阻现象。经过两年多的对比实践,笔者认为珍珠岩栽兰有如下优点: Perlite is a good substrate for soilless orchids. It is planted with orchids, can make the roots of orchids developed, vigorous growth, rare rotten roots phenomenon. Perlite light and soft, non-polluting, no suspects pests, pH is moderate, no growth resistance roots. Roots and more downright extension, color robust; blue leafy thick lush, flowering well. Perlite moderate water content, strong water filtration, in the bottom of the hole in the pot no water phenomenon; because of its slow water dispersion, it is to forget the watering the watering, it will not be too dry. Therefore, both dry and wet, will not hurt roots, injury seedlings, but will not result in excessive growth of the matrix caused by Lanmia growth blocked phenomenon. After more than two years of comparative practice, I believe the perlite has the following advantages: