Nutri？？o mineral de hortali？as: XC. Deficiências de macronutrientes, boro e zinco em milho doce

young sweet corn plants (zea mays var. sachirata l.) cv. contibrasil were transplanted to pots containing 7kg of s and size pure quartz. during the first 5 days the plants received only water. treatments were started 18 days after germination and consisted of: complete solution (all nutrients): -n, -p, -k, -ca, -mg, -s, -b, -zn. solutions were supplied to the plants through percolation. plants were collected as soon as the symptoms appeared and divided into: new leaves, old leaves, stem, tassel, straw, and cob. all the material was dried at 80°c for several days and analysed for nutrient content by laboratory conventional methods. the authors concluded that: a) omission of any of the elements reduce plant growth; b) clear cut symptoms were obtained for all nutrients; c) levels in the new leaves both healthy and diseased were: n% 1.29-0.72; p% 0.17-0.03; k% 1.33-0.15; ca% 0.90-0.74; mg% 0.36-0.03; s% 0.20-0.08; b ppm 39-21; zn ppm 3-4; and d) levels in the old leaves, both healthy and diseased, were: n% 0.54-0.48; p% 0.05-0.02; k% 1.12-0.08; ca% 1.05-0.70; mg% 0.54-0.03; s% 0.13-0.10; b ppm 58-25; zn ppm 2-10.