The eco toxicity of Cu,Zn,Pb and Cd in the single form on the inhibition of seed germination and root elongation of turnip was tested with four types of soils (red loam soils,meadow brown soils,chestnut soils and dark...The eco toxicity of Cu,Zn,Pb and Cd in the single form on the inhibition of seed germination and root elongation of turnip was tested with four types of soils (red loam soils,meadow brown soils,chestnut soils and dark brown soils),and their combined effect was determined with meadow brown soils.Data showed that with the same content of heavy metals,the root elongation was more strongly inhibited than the seed germination,indicating that root is more sensitive to heavy metals pollution than seed germination.The inhibition rates of heavy metals on the root elongation (IRHMRE)of turnip were significantly negatively related to the contents of organic matter (OR) and Kjedahl nitrogen (K N) in soils.However,there were no significant relationship between IRHMRE and soil pH,and so does the content of T K.A slight antagonism effect in root elongation was produced when Cu,Zn,Pb and Cd were combined in the concentrations.Zn,Pb and Cd resulted in the incentive effect,while Cu gave an inhibition in the single form.Furthermore,additive effect was shown when Cu,Zn,Pb and Cd were combined in the inhibition concentrations(IC>10%)of single form.展开更多
In order to find out the effect of nutrient leaching on the environment caused by fertilizing, nutrient leaching experiment was designed with soil column in size of 1.0m in depth and 0.3m in diameter, planted with oat...In order to find out the effect of nutrient leaching on the environment caused by fertilizing, nutrient leaching experiment was designed with soil column in size of 1.0m in depth and 0.3m in diameter, planted with oats glass fertilized at different doses. The leaching water was sampled once a month to analyze the content of nutrient. Results indicated that nitrogen in the form of NH 4 +-N changed with the dose of fertilizer and the seasons. The amount of nutrient leaching is positively related to the amount of urea applied. The amount of NO 3-N detected was generally much higher than that of NH 4 +-N, which indicated that NO 3-N was the main part of nitration and leaching of nitrogen, and organic nitrogen has no relation with fertilizing. Results also indicated that fixition of phosphorus was a dynamic process, and fertilization could also result in the loss of phosphorus. Fertilizing influenced leaching of potassium. However, the amount of leaching is under the standards of national and OECD’s drinking water. The experiment showed that rational application of fertilizer could result in less pollution of underground water by NO 3-N leaching.展开更多
文摘The eco toxicity of Cu,Zn,Pb and Cd in the single form on the inhibition of seed germination and root elongation of turnip was tested with four types of soils (red loam soils,meadow brown soils,chestnut soils and dark brown soils),and their combined effect was determined with meadow brown soils.Data showed that with the same content of heavy metals,the root elongation was more strongly inhibited than the seed germination,indicating that root is more sensitive to heavy metals pollution than seed germination.The inhibition rates of heavy metals on the root elongation (IRHMRE)of turnip were significantly negatively related to the contents of organic matter (OR) and Kjedahl nitrogen (K N) in soils.However,there were no significant relationship between IRHMRE and soil pH,and so does the content of T K.A slight antagonism effect in root elongation was produced when Cu,Zn,Pb and Cd were combined in the concentrations.Zn,Pb and Cd resulted in the incentive effect,while Cu gave an inhibition in the single form.Furthermore,additive effect was shown when Cu,Zn,Pb and Cd were combined in the inhibition concentrations(IC>10%)of single form.
文摘In order to find out the effect of nutrient leaching on the environment caused by fertilizing, nutrient leaching experiment was designed with soil column in size of 1.0m in depth and 0.3m in diameter, planted with oats glass fertilized at different doses. The leaching water was sampled once a month to analyze the content of nutrient. Results indicated that nitrogen in the form of NH 4 +-N changed with the dose of fertilizer and the seasons. The amount of nutrient leaching is positively related to the amount of urea applied. The amount of NO 3-N detected was generally much higher than that of NH 4 +-N, which indicated that NO 3-N was the main part of nitration and leaching of nitrogen, and organic nitrogen has no relation with fertilizing. Results also indicated that fixition of phosphorus was a dynamic process, and fertilization could also result in the loss of phosphorus. Fertilizing influenced leaching of potassium. However, the amount of leaching is under the standards of national and OECD’s drinking water. The experiment showed that rational application of fertilizer could result in less pollution of underground water by NO 3-N leaching.
