Three experiments axe described in which the response of pea plants to irrigation at different growth stages was determined. On a sandy loam soil, no increase in yield resulted from irrigation before flowering, provided the soil was at or near field capacity when the seed was sown. Irrigation before flowering increased the amount of haulm produced by the plants without any increase in the yield of peas. The application of a small quantity of water a few days before harvest, when the pods were swelling, greatly increased the yield of marketable pods and shelled peas.