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HEDTA–Nitrilotriacetic Acid Chelator-Buffered Nutrient Solution for Zinc Deficiency Evaluation in Rice

^a Texas A&M Univ. Research & Extension Center, Route 3, Box 213AA, Lubbock, TX 79403
^b Dep. of Soil, Water, & Climate, Univ. of Minnesota, 439 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108-6028

View larger version (25K): [in a new window]   Fig. 1. Calculated change in (Fe3+) and (Zn2+) vs. pH in a basal nutrient solution (pH 5.5) chelated with HEDTA and NTA with 200.0 µM total chelated Fe(III), 2.00 µM total chelated Zn, and 3.0 mM MES as calculated with GEOCHEM-PC

View larger version (25K): [in a new window]   Fig. 2. Response of IR-36 plant, shoot, and root dry mass vs. (Zn2+) at 21 d after transplanting in an HEDTA-NTA chelator-buffered system at pH 5.5. Mean ± 1 SD at each point represents eight values (duplicate trials, four plants per tub). Significance was determined at = 0.05

View larger version (39K): [in a new window]   Fig. 3. Affected rice leaves per tub (four plants) vs. (Zn2+) at 21 d after transplanting in an HEDTA-NTA chelator-buffered system at pH 5.5. Each value is the mean of two trials. Mean tiller number represents eight plants and indicates higher number of leaves for high (Zn2+)