كليدواژه :
زيوليت , آبشويي , كود اوره , آلودگي آبهاي زيرزميني
چكيده لاتين :
Nutrients and insecticides in runoff or drainage water from the agricultural lands have of long posed a great challenge to surface and ground water quality. In agricultural production, fertilizers supply the main source of nitrogen required for plant growth. Investigations have shown that part of the nitrogen fertilizers are excluded from the root zone and leached into the groundwater or rivers. Modern technologies employed cultivation, irrigation, and fertigation management s well as changes in the structure of fertilizers and insecticides could have positive effects on reducing the leaching of nitrogen. The objective of this research was to study the effect of clinoptilolite zeolite application on reduing urea leaching from soil. In this greenhouse experiment, four levels of zeolite (0, 5, 10, and 15% added to a silty clay loam soil), one level of leaching (25% of net irrigation depth), one level of fertilizer application (60 mg/L), two sizes of Mianeh zeolite (50 and 200 mesh), and one size of Mashhad zeolite (200 mesh) were used in four irrigation events. The results showed positive effects of zeolite on reducing urea leaching. The nitrogen concentration in the 0% zeolite treatment was reduced from 1337 mg/L (after the first irrigation) to 16 mg/L (after the fourth irrigation event). But, for 15% Mianeh zeolite (50 mesh),
