In order to find out the change rule of SPAD value in lettuce leaves and the rapid. non-destructive and more accurate detection method of chlorophyll content in lettuce leaves under intercropping mode. the effect of intercropping on SPAD value in lettuce leaves was studied and the correlation model between chlorophyll content and SPAD value was established. The results show that the S... https://fitnessgravesyardes.shop/product-category/spring-pulley/