搜索结果: 1-5 共查到“农业工程 D-value”相关记录5条 . 查询时间(0.054 秒)
在国内外相关研究的基础上，对木灰这类典型生物质灰的组成和物理、化学特性进行分析，并阐述了木灰作为肥料施用后对作物、土壤表层植被、土壤微生物群和环境各方面的影响。木灰的K含量不高，但是具有较高的pH值，对酸性土壤的改良作用很明显。pH值的提高可以改变土壤中微生物结构，促进微生物的活动，增加土壤肥力。同时，木灰还具有大量元素富集的特点，施用后会改变土壤中元素的构成，增加土壤中N、K等植物生长必需元素的...
农田土壤pH值和电导率采集仪设计与试验（Design and Experiment on the Field Information pH Value and Electrical Conductivity Acquisition Instrument）
土壤 pH值 电导率 采集仪
2009/8/11
设计开发了测量pH值和电导率的农田信息采集仪。在探讨该仪器测量原理和软硬件设计的基础上，分别采用两点校正法和配比KCl溶液法对采集仪的pH值和电导率测量进行了标定试验，并在一块黄豆田间隔14m×14m进行土壤采样，共采土样15个，对标定方程进行了验证试验。结果表明，土壤pH值标定结果和准确值的相对误差小于1%，土壤电导率相对误差小于14%；土壤pH值标定结果和准确值线性回归模型检验显著性概率为0....
Efficiency development of Czech foreign trade in high-technology products and high-value agricultural products
international trade foreign trade competitiveness high-technology trade agricultural trade
2014/3/29
High efficiency of foreign trade is achieved in export of the commodities that are not only price competitive. The high-technology manufactures usually have the highest value added. The same is true f...
Fair value in financial accounting
accounting, valuation harmonization standards fair value market value
2014/3/29
By progression of the expanding use of the International Accounting Standards, fair value is being pushed ahead instead of standard historical costs. The extension of the International Accounting Stan...
Comparison of the value added development in the agricultural and food sectors and the efficiency of its creation
national economy production of foodstuffs agriculture, value added ntermediate consumption fixed assets
2014/3/29
The article summarises the results of the analysis of value added (VA) in agriculture and food industry and the share of intermediate consumption in the value added. The results show that during 1993–...