ROLE OF MACRONUTRIENTS FOR CABBAGE-HEAD FORMATION - (PRELIMINARY-REPORT) GROWTH-PERFORMANCE OF A CABBAGE PLANT, AND POTASSIUM NUTRITION IN THE PLANT

The growth performance of a cabbage plant and potassium nutrition in the plant were studied under water culture conditions. The whole growth ataae was characterized by the followin, sub-growth phases: initial growth (0-30 days after sowing), outer-leaf expansion (30-60), outer-leaf development (60-90), and cabbaae-head development (90-120) phases. The outer-leaf development phase overlaps the earlier cabbaae-head development phase. As the potassium concentration in the culture solution increased from 0 to 100 ppm, the dry weiaht of the plants (harvested at 117 days after sowing) increased, and at 1000 ppm there was a slight decrease in the dry weight. The potassium content of the outer leaves, less than 0.5% on a dry basis, was unfavorable for cabbage-head formation. © 1979 Taylor & Francis Group, LLC.