乌审旗的流沙和半固定沙丘占很大部分,是有名的风沙干旱地区。在这样的地区,如何把育苗工作大量搞起来,满足大规模造林治沙需要,是值得研究的一个重要问题。为此,我愿提出几点意见,供作参考。一、积极防治母树苗的腐烂病。柳树母树苗在苗圃育苗中占有60%以上,染病率很大,如小石砭苗圃1956年扦插的63.5亩柳树母树苗,染病和死亡的占半数以上。病害发生的部位多在条子和母根上,初期呈水浸状,逐渐感染到根部,表皮和内部变为黑褐色。造成病害的原因有四:①地区干旱,各苗圃的柳树母树苗插后均未灌水:②在驮运和切穗时,表皮磨损和 Wushenqi quicksand and semi-fixed sand dune accounted for a large part, is a famous winds and sand arid areas. In such areas, how to carry out a large number of seedling raising work to meet the needs of large-scale afforestation and sand control is an important issue worthy of study. For this reason, I would like to make a few comments for reference. First, actively prevent mother tree rot disease. Willow mother tree seedlings in nursery nursery occupy more than 60%, the rate of infection is very high, such as the small Shijie nursery cuttings of 63.5 mu willow mother tree seedlings, infection and death accounted for more than half. Disease occurs more in the sliver and parent root, the initial was flooded, gradually infected to the roots, the skin and the interior into a dark brown. The cause of the disease there are four: ① regional drought, the seedlings of all the willow trees in the nursery were not irrigated: ② in the pack and ear cutting, epidermal wear and