| There is an increasing interest in reducing n losses from the agriculture soils major reason is the rapid increase in the number of polluted groundwater reservoirs in many countries.to obtain more detailed information about N process in agriculture soils, nondestructive measurement techniques with high spatial and temporal resolution are needed. Improved ability to monitor soil water and iomicchemical distributions in soils will contribute to better land management opportunities. We use Time Domain Reflectometry (TDR) to simultaneously estimate volumetric soil water content, soil solution electrical conductivity, and soil nitrate concentrations in combination with porous ceramic cup solution samplers to follow NO3-N transport in soil exposed to different irrigation, fertilizer quota and temperature.The experiment was conducted with nondestructive soil colums. Soil nitrate concentrations were estimated based onTDR ECw and a simple linear calibration of ECw Vs nitrate concentrations and then predict the soil column nitrate. The nitrate which is based on soil water retention measurements, provided Ecw and nitrate estimates in better agreement with soil column. Nitrate was leached from the soil when water application was started. Irrigation, fertilizer and temperature strategy had a large effect on the temporal envelopment in nitrate leaching. The more the irrigating quota is. the more the concentration of nitrate. The nitrate of soils will high when the soil temperature rises with the same application of nitrogen fertilizer and irrigation. When the soil water content is high, with second leaching to the soil, the. Nitrate was completely leached from the cultivated soil, and the same time soil structure has a large effect on the leaching of nitrate.The TDR measurements of Ecw with high spatial and temporal resolution combine with porous ceramic cup solution samplers to follow NO3-N transport in soil is a new, valuable method for analyzing transport of nonconservative ions in soil.
|
PDF Full Text Request