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Treatment schedule for application of iron siderophore solutions (ISS) to chlorotic soybean in calcareous soils. DAT: days after treatment; C−: negative control; C+: positive control (o,o-EDDHA); (A) A. vinelandii ISS; (B) B. subtilis ISS. A(2) and B(2) correspond to second application of A. vinelandii ISS and B. subtilis ISS, respectively.
