关键词: 莴笋, 肥料, 硝酸盐, 生长特性

Abstract: In order to study the effects of organic fertilizer, organic-mineral compound fertilizer and mineral compound fertilizer on Lettuce Growth Character and Nitrate Content in Lettuce(Lactuca sativa var angustana Irish), three kinds of fertilizers were used. The results are following:There is most significant different nitrate content when three different fertilizers are used. The lowest nitrate content happens when pig manure is used on both sandy loam soil and clay loam soil(279.5 mg/kg on sandy loam soil and 335.2 mg/kg on clay loam soil). The second nitrate content is resulted from when Heng-chang multiple-element organic fertilizer(365.1 mg/kg on sandy loam soil and 419.8 mg/kg on clay loam soil) is used. The highest nitrate content happens when three-element compound fertilizer(560.7 mg/kg on sandy loam soil and 604.4 mg/kg on clay loam soil) is used. The nitrate content on sandy loam soil is higher than that on clay loam soil, while the nitrate content three days before using fertilizer is lower than that three days after using fertilizer. There is no significant difference on Lettuce yield, plant height and open-wide when three different fertilizers are used.

Key words: LETTUCE(Lactuca sativa var angustana Irish), FERTILIZER, NITRATE CONTENT, GROWTH CHARACTER