Fertiliser applications should be based on soil analysis. Overfertilisation with nitrogen may result in increased susceptibility of the crop to various diseases or disorders. Generally, a 2:3:4 (30) fertiliser mixture at a rate of 500 to 1 000 kg/ha can be applied, depending on soil fertility. A side dressing of 150 to 250 kg LAN per hectare can then be applied at four weeks. Lettuce also responds well to organic fertilisers.