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杉木幼树黄化,树势衰弱,极易感染炭疽等叶枯病害,严重影响生长发育、成林成材.我们经过较长时间(1977—1981年)的观测研究和小面积试验,发现杉木幼树黄化与土壤缺钾有着较密切的关系.林地施钾能有效防治黄化,恢复树势,使炭疽等叶枯病害感染显著减轻.为了验证施钾防病效果,巩固杉木造林成果,确保幼林速生丰产,从1982年以来,我们根据句容、江宁两县丘陵山地土壤普查和对有关林地土样分析普遍缺钾的结果,在句容林场和省林科所试验林内进行了较大面积的施钾防病试验.一、概况和方法试验地为种源试验林、优树子代林、丰产栽培和混交试验林,林龄多为3—7年,个别10年.地形为低丘坡地和岗地,土壤分别为苏南黄砂土和下蜀系黄岗上.质地砂壤至中壤和轻粘,PH5.5—6.0,全氮含量0.0358—0.1039%,速效磷1.75—6.30ppm,
Fir yellow tree seedlings, weak banyan tree, easily infected with anthrax and other leaf blight, seriously affecting the growth and development, success of the forest .Our observation and small area test (1977-1981) after a long time, we found that young Chinese fir Tree yellowing and soil potassium deficiency are closely related to the application of potassium in forest can effectively prevent and cure yellowing and restore the tree vigor, so that anthrax and other leaf blight disease infection significantly reduced.In order to verify the effect of potassium on disease control, fir afforestation achievements to ensure Since 1982, according to the census, Jiangning counties and mountainous areas of soil census and analysis of soil samples generally related to the results of the lack of potassium in Jurong Forest Farm and the Ministry of Forestry tested a large area Of the potassium disease prevention and control test I. Overview and methods of test for the provenance test forest, excellent tree sub-forest, high yield cultivation and mixed test forest, more than 3-7 years old, individual 10 years. Slope and hillock, the soil was yellow soil in southern Jiangsu and Huang Xia on the next Department of texture sandy soils to the soil and light sticky, PH5.5-6.0, total nitrogen content of 0.0358-0.1039%, available phosphorus 1.75-6.30ppm,