农学 >>> 农学总论 作物学 园艺学 土壤学 植物保护学 农药学 林学 畜牧学 兽医学 水产学
搜索结果: 1-15 共查到知识库 农学 cost相关记录44条 . 查询时间(0.127 秒)
Small RNAs are sequence-dependent negative regulators of gene expression involved in many relevant plant processes such as development, genome stability, or stress response. Functional characterizatio...
Considering the importance of recreation and excursions in household’s basket of expenditures on the one hand, and not paying attention to the economic value of recreational function for natural resou...
The aim of this study was to assess the cost-effectiveness of a fermented liquid feeding and enzyme supplementation of dry fodders containing rye grain for pig fattening. Two experiments were performe...
We evaluated recreational and socioeconomic values of Masouleh forest park, north of Iran. Travel Cost Method (TCM) or Clawson method was used for evaluation. Therefore, 96 questionnaires were distr...
This research compared roadside chipping and road side processing systems. Two sites planted with Eucalyptus globulus were selected to study these harvesting systems. A time and motion study was appli...
We present research results of timber skidding by a Timberjack 450C skidder in the path cutting of pine trees in Shafaroud watershed. Time studies were conducted to quantify the productivity and perat...
In this study, productivity rate and operation cost of farm tractor were evaluated in a mountainous natural forest. Data for the study came from a detailed time study in the Research and Educational F...
This paper presents research results on the performance of the Timberjack 450C skidder in timber skidding at two working sites of broadleaved trees in mountainous conditions in the Hyrcanian forest. T...
The Bruks mobile chipper was tested for chipping extracted non-merchantable stemwood at the roadside in Pine plantation in Victoria. The elemental time study method was used to evaluate the system pro...
A field production study was conducted for a manual harvesting system using a chainsaw in a Caspian hardwood forest site. A selective cut was performed on a 42-hectare tract with an average slope of 3...
The paper describes the system for measuring and logging of data on soil water content and soil temperature profile. The system was tested in a field and shows great potential for performing continuou...
Agriculture constitutes a specific sector of the Romanian economy. It does not contribute significantly to the increase in the gross domestic product, however, it is expected to fulfil three important...
Agriculture constitutes a specific sector of the Romanian economy. It does not contribute significantly to the increase in the gross domestic product, however, it is expected to fulfil three important...
This study presents economics of scale and cost efficiency of small scale production of maize in Mubi North Local Government in Adamawa state, Nigeria. A multi stage sampling techniques was used to se...
The paper estimated the cost of tsetse control and treatment of trypanosomiasis and the benefits involved, using benefit-cost analysis. It also estimated the extent to which socio-economic characteris...

中国研究生教育排行榜-

正在加载...

中国学术期刊排行榜-

正在加载...

世界大学科研机构排行榜-

正在加载...

中国大学排行榜-

正在加载...

人 物-

正在加载...

课 件-

正在加载...

视听资料-

正在加载...

研招资料 -

正在加载...

知识要闻-

正在加载...

国际动态-

正在加载...

会议中心-

正在加载...

学术指南-

正在加载...

学术站点-

正在加载...