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1984年春,淮滨县林业局在刘大元等林场,采用了地膜覆盖新技术,进行了池杉地膜覆盖育苗试验,基本上解决了池杉实生育苗产量低和当年不能出圃的问题。现将试验结果报告于后: 一、试验地基本情况试验地位于淮河流域,面积125亩,地处南北气候过渡地带,年降雨量926.8毫米,多春旱,绝对最高气温40.2℃,绝对最低气温—21.4℃,全年无霜期228天。土壤为砂壤疆褐土,有机质含量1%左右,硝态氮单位
The spring of 1984, Huaibei Forestry Bureau in Liu Dayuan and other forest farms, the use of new technology of plastic film mulching, plastic film mulching seedling test, basically solved the production of seedlings of Ipomoea pubescens seedling production is low and can not be out of nursery problems. The test results are reported later. I. Basic conditions of the experimental site The experimental site is located in the Huaihe River Basin with an area of 125 mu. It is located in the transition zone between the north and the south and the annual rainfall is 926.8 mm. In spring, the maximum absolute temperature is 40.2 ℃, and the absolute minimum temperature -21.4 ℃, frost-free period throughout the year 228 days. Soil is sandy loam cinnamon soil, organic matter content of about 1%, nitrate nitrogen units