我们在1987年第1期《食用菌》上发表了“棉籽壳袋栽银耳的技术改进”一文后,一些读者来信询问不先封接种口怎样防止杂菌污染?对此问题我们于3月底进行了试验,现初报如下:试验方法培养料配方为:棉籽壳50公斤,麦麸15公斤,石膏1.5公斤,白糖750克,硫酸镁250克,黄豆粉500克,水67.5公斤.试验分5组,每组100袋(聚丙烯袋, After we published a paper titled “Technical Improvement of Cottonseed Shell-bagged Tremella in the First Issue of 1987” Edible Fungi, some readers asked us if we did not seal the breed first to prevent bacterial contamination. The test, the first report is as follows: Test Method Training material formula: cotton hulls 50 kg, 15 kg of wheat bran, gypsum 1.5 kg, 750 grams of sugar, magnesium sulfate 250 grams, 500 grams of soy flour, water 67.5 kg. Group, each group of 100 bags (polypropylene bags,