搜索结果: 1-15 共查到“知识库 农业工程 soil”相关记录57条 . 查询时间(0.157 秒)
Yield and fuel characteristics of willows tested for biomass production on agricultural soil
short rotation coppice emissions native willow
2016/12/9
Short rotation coppice (SRC) plantations of fast growing trees in Czech Republic may be grown on approximately 120,000 ha in future, as indicated in the Czech Action Plan for Biomass. Until now, 2,800...
Survey of soil water distribution in a vineyard and implications for subsurface drip irrigation control
gravimetric water content Sentek Diviner spatio-temporal variability volumetric water content
2016/8/2
Controlling a subsurface drip irrigation system based on soil water monitoring is a very efficient way to supply grapevines with water for optimal thriving and high vintage quality. However, finding a...
Labile forms of carbon and soil aggregates
ecosystem labile carbon macro-aggregates soil type
2016/8/2
Soil organic matter (SOM) plays an important role in the soil aggregation and vice versa, its incorporation into the soil aggregates is one of the mechanisms of soil organic carbon stabilization. In t...
Pendimethalin degradation in soil and its interaction with soil microorganisms
biodegradation half-life persistence pesticides
2016/8/2
Pendimethalin [N-(1-ethylpropyl)-3,4-dimethyl-2, 6-dinitrobenzenamine] is a herbicide used worldwide to control most annual grasses and common weeds in cereals, fruit, and vegetables. Its degradation ...
Evaluations of the effects of soil properties and electrical conductivity on the water content reflectometer calibration for landfill cover soils
soil electrical conductivity soil index properties time domain reflectometry volumetric water content WCR calibration
2016/8/2
This study presents soil-moisture calibrations using low-frequency (15–40 MHz) time domain reflectometry (TDR) probe, referred to as water content reflectometer (WCR), for measuring the volumetric wat...
Application of 3D cameras in agriculture when evaluating the quality of soil tillage
PMD sensor picture model soil roughness measurement
2016/7/6
The paper deals with the evaluation of data collected by scanning the agricultural surface with a 3D Photonic Mixer Device (PMD) camera with IFM company electronics and a resolution of 64 × 50 pixels ...
Estimation of the soil water retention curve (SWRC) using pedotransfer functions
continuous pedotransfer function soil water retention curve fitting parametric method neural network
2015/1/30
Soil hydraulic characteristics, especially the soil water retention curve and hydraulic conductivity, are essential for many agricultural, environmental, and engineering applications. Their measuremen...
Silage-corn harvesting machinery traffi c eff ects on soil bulk density and water permeability
repeated traffi c passes silage harvester soil compaction soil physical damage soil porosity
2014/2/24
Soil compaction caused by machinery traffi c aff ects the growth of agricultural crops and also has environmental eff ects
like soil damage and erosion. Field experiments were cond...
MICROWAVE REMOTE SENSING IN SOIL QUALITY ASSESSMENT
Microwave Remote Sensing Soil Quality Soil Salinity Soil Erosion Soil Physical Properties Soil Roughness
2014/5/6
Information of spatial and temporal variations of soil quality (soil properties) is required for various purposes of sustainable agriculture development and management. Traditionally, soil quality cha...
大田尺度下车载式土壤多参数测量方法研究（On-the-go Measuring Method of Soil Parameters in Field-scale）
土壤参数 车载式测量 大田尺度
2010/12/29
应用自行研制的土壤含水量、电导率与耕作阻力车载测试系统以及EM38电导率测试仪，在特定的耕作和施肥管理制度试验田中进行大田尺度下的土壤多参数车载测量研究。在土壤参数空间分布信息基础上进行相关分析，结果表明复合传感器具备农田土壤含水量和电导率变异响应能力，进一步建立了农田土壤电导率与含水量、耕作阻力以及施肥信息之间的统计预测模型。
EC-5土壤水分传感器温度影响机理及补偿方法研究（Temperature Effect Mechanism and Compensation Method of EC-5 Soil Moisture Sensor）
土壤介电常数 土壤水分传感器 最小二乘支持向量机 温度补偿
2010/12/29
针对EC-5传感器温度实验中出现的两种截然不同现象，根据温度对土壤介电常数和电导率影响的机理分析，建立土壤水分传感器测试结果随温度变化的理论模型。通过对模型的仿真分析发现，EC-5传感器测得的土壤水分含量随温度变化的趋势与土壤电导率密切相关。利用最小二乘支持向量机对传感器的温度实验数据建立补偿函数并提出相应补偿算法，有效地抵消了温度变化造成的传感器测试误差。
WSN土壤湿度采集节点电压补偿方法研究（Voltage Compensation Method of WSN Soil Moisture Acquisition Nodes）
无线传感器网络 土壤湿度 神经网络 补偿
2010/12/29
针对适用于WSN土壤湿度采集节点的EC-5传感器对电源电压敏感的问题，从传感器工作原理入手分析电源电压引起检测误差的来源，且发现当传感器各项参数确定后，这种误差随着被测土壤湿度增大而增大。采用CC2430芯片作为WSN信息传输节点，建立具有多节点的上下位机WSN土壤湿度采集系统，以节点电压u和被测土壤实际湿度θ为对象，运用神经网络对采集节点中非线性土壤湿度传感器系统进行逆向建模，在上位机上...
覆膜开孔蒸发条件下土体高度对水盐运移的影响（Effects of Soil Column Heights on Movement of Soil Water and Soil Salt-during Evaporation under Perforated Plastic Mulch）
覆膜开孔率 土体高度 单位深度累积蒸发量
2010/12/29
通过不同高度土体在不同覆膜开孔率条件下的室内蒸发试验，研究了土体高度变化时水盐分布的差异与相互联系。试验结果表明，不同高度土体的单位深度累积蒸发量与时间变化符合Gardner理论关系，单位深度累积蒸发量与时间和土体总高度存在二元线性函数关系；单位深度累积蒸发量和单位膜孔面积单位深度累积蒸发量均与土体高度和覆膜开孔率存在较好的函数关系；土体高度越小，单位深度含盐量和盐分浓度变化幅度越大，土体高度是影...
环形土槽微耕机试验平台设计（Design of Micro-cultivator Testing Platform with Annular Soil Bin）
微耕机 土槽 试验平台 无线通讯
2010/12/29
针对传统的微耕机田间试验受多种因素影响，而室内直线土槽无法进行可靠性试验，设计了可连续作业的环形土槽微耕机试验平台。采用闭合式环形土槽及轨道，实现试验平台长时间循环作业。各功能台车分开布置，台车上、下部的六轮行走机构及可转动的侧轮支轴，实现了台车在轨道上平稳运行及顺畅转弯。微耕机试验平台融合了上、下位机的自动控制技术、多传感器技术、无线通讯技术、园林灌溉技术等，实现了田间工况的重复模拟，既可进行性...
黄土区农草混合利用坡面土壤水分空间变异性（Spatial Variability of Soil Water Content on a Cropland-grassland Mixed Slope Land in the Loess Plateau, China）
土壤水分 农草混合结构 空间变异性
2010/12/29
通过对黄土区农草混合利用坡面的土壤水分分析，研究土地利用结构对土壤水分空间变异特性的影响。结果表明，研究区坡面土壤水分呈中等变异，且农草混合利用结构明显增加了土壤水分的空间变异强度，坡面土壤水分具有明显空间结构性。干湿条件下坡面0～60cm土层平均含水率的半方差最优理论模型分别为高斯模型和球状模型，且干旱条件较湿润条件下保持较高的基台值和变程，而块金值/基台值相对较低。Kriging插值结果显示...