ABSTRACT The objective of the study was to evaluate the competitive ability of summer crisp and butterhead lettuce types in coexistence with populations of ryegrass. The experimental design was completely randomized in a factorial 2 x 7 scheme. with four replications. On the A factor the lettuce types (summer crisp and butterhead) were allocated and. https://fitnessgravesyardes.shop/product-category/speed-controller/