| On the basis of analyzing and summarizing the national and international research results of film hole irrigation theory and technique,combined with national natural science foundation of China and key laboratory foundation in Shaan'xi province, water and nitrogen transport characteristics under different fertilization in the film hole infilitration were studied. The influence factour were stressedly analyzed in the film hole fertile-liquid infiltration. the main research conclusion are shown as follow:1. The infiltration laws were contrastedly analyzed in the instance of pure water and the NH4NO3 liquid. The mathematical models were setted up in the film hole fertilization liquid infiltration. The wetting edge transport laws, distribution of the water ratio in soil, NO3--N and NH4+-N in soil were concluded.2. The influential factors in the film hole fertile-liquid infiltration were researched. The influence of the infiltration ability, the wetting edge transport, the distribution of NO3--N in film hole fertile-liquid infiltration were analyzed by changing the the diameter of the film hole, the initial water ratio in soil, the soil bulk density and the fertile-liquid concentration.3. The characteristics of the film hole infiltration were researched in three different fertilization manner on the basis of the indoor experiment. The mathematical models of the cumulative volume, The wetting edge transport laws in the finished water and the water-redistribution, the water ratio and NO3--N in the wetting body were cocluded in film hole infiltration. The distribution of the water ratio and NO3--N in the level and vertical of the wetting body were analyzed when cutting off the water supply after redistributing the water in the wetting body, and the mathematical models of the water ratio in the level and the vertical were setted up. The distribution laws of the water and NO3--N in the level and vertical were compared. |
PDF Full Text Request