关键词: 环境毒性, 环境毒性

Abstract:

This study proceeded in the tobacco fields from 2004 to 2006 based on the fact that preceding crops, vegetables enlarged in planting area and were fertilized much and those practices affected yield and quality of tobacco. The results showed that the preceding crops, wheat, canola, broad bean, garlic and leaf vegetables had different impacts on yield, economic output and the ratio of quality tobacco in the field with the same amount of soil nitrogen and nitrogen application amount. Therefore, when nitrogen amount was applied to tobacco the preceding crops should be considered carefully except the soil nitrogen. The nitrogen amount should be strictly limited if the preceding crops were garlic, leaf vegetables and vegetable pea. The study provided fertilizer application for tobacco production with an inter-relationships table among soil-effective nitrogen, applied nitrogen and preceding crops.