1. © EFFECT OF CHELATE FERTILIZERS ON METAL CONCENTRATIONS AND GROWTH OF CORN IN A POT EXPERIMENT SADIQ, M; HUSSAIN, G MARCEL DEKKER INC, JOURNAL OF PLANT NUTRITION; pp: 699-711; Vol: 16 King Fahd University of Petroleum & Minerals http://www.kfupm.edu.sa Summary Com was grown in a sandy loam soil in 8-kg pots. A basal dose of NPK (150, 120, and 100 kg/ha) fertilizers was mixed with the soil before potting and the treatment was repeated when the plants were 30 days old. Five different chelate fertilizers were applied 7 days after germination at three rates. Com plants were harvested 50 days after sowing, dried, weighed, and assayed for their aluminum, cadmium, calcium, cobalt, chromium, copper, iron, potassium, magnesium, molybdenum, lead, nickel, strontium, titanium, tungsten, vanadium, phosphorus and zinc content. The maximum dry matter yield was found in F3 treated plants, followed in descending order by F1, F2, F4, F5, and Cont (control). Application of fertilizer F3 completely eliminated iron-deficiency symptoms. Fertilizers (F1 and F2) prepared from fish extract were better in improving dry matter yield than the lignosulfates and inorganic chemicals, but inferior to fertilizer F3. Concentrations of iron, phosphorus, and calcium followed the intensity of chloritic symptoms, i.e., the highest concentrations in the control and the lowest in fertilizer F3. In general, barium, chromium, cobalt, lead, nickel, molybdenum, vanadium, and zinc were higher in com plants receiving fertilizers F1 and F2. The results of regression analyses indicated that the interactions between the above elements can be grouped in to three categories according to their associations with each other; (a) elements iron, calcium, strontium, and phosphorus were strongly (P<0.001) intercorrelated, (b) elements chromium, cobalt, nickel, lead, titanium, molybdenum, vanadium, and zinc were very significantly (P<0.001) associated, and (c) all the remaining elements had no special associations. Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa

2. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. © References: BRINKLEY D, 1989, PLANT PHYSL ECOLOGY, P75 CHU LM, 1987, PLANT SOIL, V103, P191 KANNAN S, 1984, J PLANT NUTR, V7, P187 LINDSAY WL, 1972, MICRONUTRIENT AGR, P7 LINDSAY WL, 1978, SOIL SCI SOC AM J, V42, P421 LINDSAY WL, 1982, J PLANT NUTR, V5, P821 MCLEEN KS, 1987, COMMUN SOIL SCI PLAN, V18, P1303 MENGEL K, 1986, J PLANT NUTR, V9, P161 MORTVEDT JJ, 1972, MICRONUTRIENT AGR NABHAN NM, 1977, PLANT SOIL, V46, P603 NORVELL WA, 1972, SOIL SCI SOC AM J, V36, P778 PAL AR, 1990, FERT RES, V22, P129 SENESI N, 1970, COMMUN SOIL SCI PLAN, V10, P1109 SENSEI N, 1981, FERT RES, V2, P289 VIETS FG, 1973, SOIL TESTING PLANT A, P153 WALLACE A, 1983, J PLANT NUTR, V6, P425 WALLACE A, 1983, J PLANT NUTR, V6, P429 WALLACE A, 1983, J PLANT NUTR, V6, P513 For pre-prints please write to: abstracts@kfupm.edu.sa Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa