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农场间
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     C.
     批C.
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     Grandpa's Farm
     爷爷的农场
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     Lessons from an Ant Farm
     蚂蚁农场的启示
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     The Dust Removing Method for Hackling Room in Flax Mill
     亚麻栉梳除尘
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  interfarm
Enhancement of farm biosecurity would be a useful measure to reduce entry of virus onto farms and interfarm spread.
      
Interfarm and intrafarm epidemiological studies, using the PCR assay as a diagnostic tool, could further clarify this issue.
      


The main purpose of this animal experinent (or survey) is to study multistage sampling, residual analysis and optimum allocation within stage sampling. In this paper authors recommend a mathematical model, variance analysis model with its estimated mean square, and also discuss the best allocation of sampling survey. Authors have conduetcd a survey on milk production (Ist lactation, 305 days) of black and white dairy cattle in a city as an example for three stage sampling survey (Farms as Ist stage, Subfarms...

The main purpose of this animal experinent (or survey) is to study multistage sampling, residual analysis and optimum allocation within stage sampling. In this paper authors recommend a mathematical model, variance analysis model with its estimated mean square, and also discuss the best allocation of sampling survey. Authors have conduetcd a survey on milk production (Ist lactation, 305 days) of black and white dairy cattle in a city as an example for three stage sampling survey (Farms as Ist stage, Subfarms as 2nd stage, Individual cow as 3rd stage) By taking F-test, it has beed found that residual variance between individuals is greatest, but the differences between farms and between subfarms are not signiicant. At the end of this paper, it has been suggested how to make the best sampling scheme under the guarantee of certain precesion with the lowest cost.

三级抽样试验经F检验,认为农场间与分场间差异不显著,各级误差方差结果以个体间误差方差最大。作者在保证一定精确度下,结合调查费用,探讨了最优配置的抽样方案。

On the basis of the status quo investigations inseveral typica large and middle size farms and defining princi-ples of ecolonomic evaluation index system.The index systemfor assessing the ecolonomic status of farm was established.The ecological regionization method provided by FAO andmain component analysis method were applied to screening in-dex from index system. On the basis of summarizing the previ-ous research results and in combination with the practical situ-ation of farms ,an evaluating equation(Y=10X_1+0....

On the basis of the status quo investigations inseveral typica large and middle size farms and defining princi-ples of ecolonomic evaluation index system.The index systemfor assessing the ecolonomic status of farm was established.The ecological regionization method provided by FAO andmain component analysis method were applied to screening in-dex from index system. On the basis of summarizing the previ-ous research results and in combination with the practical situ-ation of farms ,an evaluating equation(Y=10X_1+0. 075(X_2+X_3)+0.6X_4+5(X_5+X_6)+2X_7+0.15X_8+0.0015X_9),whican con comprehensively reflect the present ecolonomic sta-tus of farms,was developed and applied in the assessment ofrural ecolonomics.The assessment indexes and methods de-fined in the study can be applied not only in various farms,butalso in various countryside of different regions in China.ItpIays a guiding role in the ecolonomics assessment of varioustypes of ecosystems in different regions of China.

本文在对几个典型大中型农场现状调查基础上,根据生态经济评价指标体系的确定原则.确立了评价农场生态经济现状的指标体系。同时,为消除不同地区间农场的资源差异,便于不同农场间的相互比较,又采用FAO提供的生态区域法和主成分分析法对指标体系进行指标筛选,并在总结前人研究的基础上,结合农场实际,建立了能综合反映农场生态经济现状的评价方程Y=10X_1+0.075(X_2+X_3)+0.6X_4+5(X_5+X_6)+2X_7+0.15X_8+0.0015X_9,并把它运用到农村的生态经济评价中。本文确定的评价指标和评价方法,不仅适用于不同地区的各类农场,也适用于我国不同地区的各类农村。对我国不同地区不同类型的生态系统生态经济评价具有普遍的指导意义。

 
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