نتایج جستجو برای: soil bulk density
تعداد نتایج: 646486 فیلتر نتایج به سال:
Three advanced technologies to measure soil carbon (C) density (g C m(-2)) are deployed in the field and the results compared against those obtained by the dry combustion (DC) method. The advanced methods are: a) Laser Induced Breakdown Spectroscopy (LIBS), b) Diffuse Reflectance Fourier Transform Infrared Spectroscopy (DRIFTS), and c) Inelastic Neutron Scattering (INS). The measurements and so...
crops every 3 yr) and even continuous (annual) cropping in some instances. For example, annualized grain yields Water is the principle limiting factor in dryland cropping systems. for WCF are 75 to 100% greater than WF (Peterson et Surface soil physical properties influence infiltration and cropping al., 2000). Cropping intensification has been possible systems under no-till management may affe...
neutron and gamma-ray sources whichenable bulk density and moisture to be determined simultaneously. This instrument has a single probe which provides for both gamma-ray scattering and gamma-ray transmission depending on the required depth of measurement. Surface measurements (0 to 100mm integrated) are made with the backscatter technique (Figure 2) and the measurements between 50 and 300 mm ar...
In Zagros forest ecosystem, spatial variability of soil and vegetation properties are controlled by series of physical and biological parameters including topographical and anthropogenic factors. Distribution patterns of these properties are greatly variable. In the current study, geostatistics and fractal theory were used to assess the spatial variability of tree canopy and soil bulk density i...
Machine traffic and timber skidding significantly affect the soil surface and soil properties. The effects are mostly negative and result in soil erosion, worsening of soil properties and inhibition of the growth of roots and soil organisms. In this study, we evaluated forest soil damage caused by the HSM 805 HD wheeled skidder during timber skidding in selected forest stands in the School Fore...
Land use change is an important issue in Iran, especially in the north of the country. In the present research, effect of changing land use from rangeland to cropland and garden on some physical and chemical characteristics of soil, was studied in Babolrood Watershed in southern part of Babol, Eastern Bandpey in Mazandaran province. For each land use, soil samples were collected from 2 depths a...
The variation of soil compactibility and its relationship to plasticity, texture, organic matter and particle density is considered for 156 sites and for one intensively sampled site. These sites were concentrated in east Scotland and were the locations of Scottish Agricultural College (SAC) ®eld experiments and surveys related to tillage and compaction. Compactibility was determined by a ramme...
This study was designed to investigate the effects of different tillage systems on some parameters such as soil salinity (pH, EC, SAR), soil density and nutrients in a nested experimental design with three treatments (no tillage, reduced tillage and conventional tillage) and three replications. Chenaran city fields were selected as the case study areas. Result of the statistical analysis indica...
soil compaction has become a widespread problem in the world and it is considered as one of the main factors affecting land degradation in arid and semi-arid agricultural land. the aim of this study was to investigate the effects of soil compaction on soil carbon and nitrogen sequestration, physical (aggregate stability, saturated soil moisture content, bulk density, and porosity) and chemical ...
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