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杉木炭疽病所致生长损失率预测模型及防治指标的研究(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
1992年03期
Page:
57-62
Column:
研究论文
publishdate:
1900-01-01

Article Info:/Info

Title:
A STUDY ON FORECASTING MODELS TO GROWTH LOSS PERCENTAGE OF CHINESE FIR CAUSED BY GLOMERELLA CINGULATA AND AN APPROACH TO THE ECONOMIC THRESHOLD
Article ID:
1000-2006(1992)03-0057-06
Author(s):
Deng Desheng
Central-south Forestry College
Keywords:
Chinese fir Anthracnose Loss percentage Model Forecasting precision
Classification number :
-
DOI:
10.3969/j.jssn.1000-2006.1992.03.011
Document Code:
A
Abstract:
On the basis of a 35-sample-plot survey in Hunan and Hubei provinces forecasting models to growth loss percentage have been established, that forecasting precisions are as high as or above 90%. they are, y being growth loss percentage and x disease index, y(tree height) = 28. 00( 1 + 32. 0885nomic threshold models, been derived. Because there are not suitable techniques which can estimate the loss value by the disease and producing value per unit growth , the writer has put forward the disease econmic threshold index, x(ET).T) = 15. In addition it is evaluated that the Chinese fir tree volume outside bark loss of China yearly reaches 920574m3 with costs of 230143500 yuan.

References

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Last Update: 1900-01-01