Effects of different nutrient solution EC values on the growth and nutritional quality of Lactuca sativa L.
A single factor experiment is designed to clarify the effects of nutrient solution EC values on the growth and nutritional quality of different varieties of Lactuca sativa L..A total of three nutri-ent solution EC values(1.6,2.0 and 2.4 mS/cm)are set up for the study.Two types of Lactuca sa-tiva L.are cultured.Besides,their agronomic traits,photosynthetic indicators and nutritional quality are measured.The results indicate that different nutrient solutions EC values have different effects on different varieties of Lactuca sativa L..When the EC value is 1.6 mS/cm,it is beneficial for the growth of the variety Zixia,manifested as a larger crown width,wider maximum leaf width,higher photosynthetic indicators,higher dry matter and vitamin C content.When the EC value is 2.0 mS/cm,it is beneficial for the growth of the variety Malina,while the nutritional indicators are lower.There are significant differences in the response of agronomic traits,photosynthetic indicators and nutritional quality of different varieties of Lactuca sativa L.to nutrient solution EC values.Therefore,in the process of planting Lactuca sativa L.,the EC value of nutrient solution should be adjusted appropria-tely according to the variety and growth period so as to avoid waste.
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