Quality control is performed on experimental plots. Each year, we set up more than 12,000 plots to examine all seed batches purchased from the producers and other suppliers as well as those sold to consumers in previous seasons. First, we judge the germination rate. Seeds from each batch are sown on pallets in greenhouses to enable us to evaluate their germination capacity. Then, young plants are planted out on plots. When the plants blossom or fructify, we systematically evaluate their variety identity.