The objective of this paper was to clarify the temporal and spatial two-dimensional variations of volumetric water content and NO3-N concentration in soil under drip irrigation. A numerical model was used for estimating temporal and spatial movements of water and NO3-N in soil. Laboratory experiments were conducted to estimate the physical properties such as soil water retentivity and conductivity. A field observation was conducted to evaluate the model accuracy. The temporal and spatial changes of volumetric water content and NO3-N concentration in soil were measured in a 1 m×l m×1 m lysimeter where NH4NO3 solution was supplied in a row. The results of simulation calculated by the model agreed well with observed data. By using the model, temporal and spatial variations of soil water content and NO3-N concentration were calculated. The results described simultaneous movements of water and NO3-N spreading in a soil profile. The numerical model introduced here can be effective to estimate variations of water and NO3-N in soil.
|Number of pages
|Journal of the Faculty of Agriculture, Kyushu University
|Published - Sept 2011
All Science Journal Classification (ASJC) codes
- Agronomy and Crop Science