STUDIES ON THE EFFECT OF POTASSIUM ON THE GROWTH, YIELD AND NUTRIENT UPTAKE OF TWO NEWLY INTRODUCED RICE VARIETIES (Tainam 3 and Taichung Native I) - N N RAMAN KUTTY; A P A BRITO MUTUNAYAGAM (AGRICULTURAL COLLEGE AND RESEARCH INSTITUTE VELLAYANI DIVISION OF AGRICULTURAL CHEMISTRY, 1967)