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By detecting the nutrient elements contents in soil for monitoring the rice growth and conditions of nutrients, a month after fertilization N, P, K and no fertilization in paddy soil have been analyzed by laser induced breakdown spectroscopy (LIBS) technique, which is using a Nd: YAG ns laser at 1064 nm and an eight-channel AvaSpec spectrometer with CCD detector. The characteristic spectra and the...
Domestic sewage was treated with subsurface wastewater infiltration system covered by two different turf grass, namely, Festuca aroundinaces Schres and Zoysiajaponica Steud to study the removal effects of N and P. The result show that TN concentration of Festuca around inaces Schres varied from 46.8 to 52.7 g·kg-1 and it was significantly higher than that of Zoysia japonica Steud. The TP concentration...
Soil and water loss is an important source of water eutrophication. In this study, soil erosion were measured in the four types of cultivated lands (Paddy land, Terraced farmland, Sloping farmlands <; 25°, and Sloping farmlands ≥ 25°) in Xiaojiang River basin, Chongqing of China. In addition, water qualities were investigated in 5 reaches of Xiaojiang River (Qukou, Yanglu, Gaoyang, Huangshi, and...
GIS and the fundamentals and methods of geostatistics were applied to regionalize the spatial distribution pattern of Available Potassium, Available Phosphorus, Available Nitrogen and Organic Matter in Jinghe Basin. The results showed that: 1 It is clearly founded that the spatial heterogeneity of the soil available nutrient in Jinghe basin, and the human activities had seriously impacted on the spatial...
Wheat is one of the most important crops in the world. So the safety of wheat product is essential to people's health. With imitating experiment of arsenic polluted soil in pots, effects of nitrogen and phosphorus fertilizers on yield and quality characters of wheat were studied, and arsenic contents of wheat root, stem, grain and soil were determined detailedly. The effective measures by adding nitrogen...
Agricultural Non-point Sources Pollution is one of a leading cause of water quality problems in southeast of China. It is an effective approach for ANSP control that modeling nitrogen and phosphorus transfer in a basin system by using mathematic models based on geographic processes. In this paper, the multi-scale integrating distributed modeling frame was designed based on different spatial discretization...
The effect of irrigation of municipal reclaimed wastewater on soil microbial properties in Bei Yechang irrigation area was studied. Reclaimed wastewater irrigation and freshwater is similar to a certain extent can increase the microbial biomass carbon (MBC) under different treatments, rotation treatment increase significantly among these treatments, and almost close to CK. Soil respiration highly...
An experiment was conducted under hydroponic culture conditions to determine effects of nitrogen (N), phosphorus (P) and sulfur (S) deficiency on Tagetes erecta L. growth, cadmium (Cd) accumulation and chemical forms. Seedlings of similar age and size were pre-cultured in either N-, P-, or S-deficient nutrition solution for 12 days before exposure to 0.1 mg Cd L-1 (nonphytotoxic). The control group...
This study has investigated the effect of humus soil activated sludge on the nitrogen and phosphorus removal. The results from experiments indicate that humus soil SBR (HS-SBR) process did not have a better effect on the COD removal compared it with SBR process. They had about 89% removal efficiency on average. HS-SBR process could enhance the removal of nutrient salt, especially TP. The removal efficiency...
After water storage of Laohutan reservoir, nitrogen (TN), total phosphorus (TP) and ammonia nitrogen (NH3-N) are the main pollutants. In the first month of water collection, the vertical distribution of TN, TP and NH3-N concentrations is increased distinctly from the surface layer to the bottom layer. It shows that the reservoir water quality is affected by pollutants released from submersed soil...
Pollutants release from submerged soil will affect the water quality for a new-built reservoir during the preliminary water storage. The Baohe reservoir is the only one regulating reservoir in the Middle Route of the South-to-North Water Transfer Project (SNWTP). The pollutant release from soil is the important way to impact the water quality of the Baohe reservoir at the beginning of water storage...
The stability of remote sensing indicators of leaf water, chlorophyll and nutrients to discriminate between Eucalyptusgrandis growing on different site qualities in KwaZulu-Natal, South Africa was evaluated for two growing seasons (winter and early summer). Site quality was defined by the total available soil water (TAW). Canopy reflectance spectra for 68 trees (winter) and 45 trees (summer) from...
A two-stage subsurface-flow constructed wetland (SSFCW); combined with horizontal flow constructed wetland (HFCW) and vertical flow constructed wetland (VFCW) was established to investigate nutrients transfer in the carriers and the macrophytes. Under average temperature of about 24.8degC, the system operated in the hydraulic load of 0.3~0.4m3m-2d-1 and six dominant natural macrophytes conditions...
Sewage sludge and the compost were evaluated through chemical characterization and toxicity testing to determine their suitability for land application. The application of sewage sludge/compost, slightly acidic with pH rang of 6.4-6.5, decreased the soil pH. The higher the sewage sludge/compost rates, the higher the mixed soil contents of electrical conductivity (EC), organic matter (OM), nitrogen...
The objective of this research was to evaluate the prediction ability of NIR to soil nutrient content. A total of 165 soil samples were obtained from the field and analyzed their spectra features. 135 samples spectra were used during the calibration and cross-validation stage, 30 samples spectra were used to predict N, P, K and OM concentration. NIR spectra and constituents were related using partial...
With the introduction of GPS and GIS, the spatial variability of soil properties was measured and analyzed using traditional statistics method and geo-statistics. 63 sampling points were measured on a 50 m grid in the soil surface (0~20 cm) of a 13.3 hectare winter-wheat field and were positioned by the GPS receiver. The results show that all soil nutrients are normal distribution and represent moderate...
As a type of nonlinear dynamic parallelism system, artificial neutral network has a capacity of identifying complex causal relationships between variables, such as those between the winter wheat yield and the soil spatial distribution nutrients, including water content, organic matter, total nitrogen, alkali-hydrolysable nitrogen, rapidly available phosphorus and potassium. By training 50 tested soil...
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