abstract: The work presents research results from 2006–2009. The study aimed at comparing tuber yield performance and quality of potato tubers manured with undersown catch crops in the integrated and organic production system. Two factors were considered in the experiment: 1. manuring with undersown catch crop: control (no catch crop), farmyard manure, undersown catch crop biomass ploughed under in the autumn (Persian clover, Persian clover + westerwolds ryegrass, westerwolds ryegrass), undersown catch crop biomass retained as mulch on the soil surface until the spring (Persian clover, Persian clover + westerwolds ryegrass, westerwolds ryegrass); and 2. production system: integrated and organic. Spring triticale cultivated for grain was undersown with the catch crops and was followed by table potatoes the following year. At harvest, the total and marketable yields of potato tubers were measured. Samples were taken to determine starch content, vitamin C content and true protein content. The results of the study demonstrated that the highest potato tuber yields were harvested from Persian clover/westerwolds ryegrass plots as well as Persian clover mulch plots. Potato tuber yield and chemical composition were affected by the production system. An application of undersown catch crops, excluding westerwolds ryegrass, can fully replace farmyard manure used in potato cultivation.