STUDIES ON RELATIONSHIP BETWEEN WATER SUPPLY AND GROWTH IN A POPLAR PLANTATION I. THE EFFECT OF WATER SUPPLY ON GROWTH, ARCHITECTURE AND LEAF QUANTITY OF TREE STUDIES ON RELATIONSHIP BETWEEN WATER SUPPLY AND TREE GROWTH IN A POPLAR PLANTATION.II.ANALYSIS OF THE RELATIONSHIP BETWEEN WATER SUPPLY IN THE FIELD, WATER-CONSUMPTION FOR TRANSPIRATION AND VOLUME INCREMENT AND ESTIMATION OF WATER REQUIRMENT IN