Studies on use of DTPA and eddha chelates to supply micronutrients to plants in soils includingsimulated drip irrigation

Abstract

In an experiment with calcareous Hacienda loam soil and simulated drip irrigation, FeEDDHA was far superior to FeDTPA in supplying Fe to T203 soybeans. The FeEDDHA applied at constant low levels also increased the Zn, Cu and Mn contents on the per plant basis implying that the procedure is not likely to induce deficiencies of those micronutrients. In an experiment with Yolo loam soil which was not calcareous, ZnDTPA and MnDTPA in the irrigation water did increase micronutrient contents of com growing in the soil. With small peach trees grown in the glasshouse in soil, ZnDTPA and MnDTPA resulted in increased uptake of Zn and Mn and often increased uptake of Fe and Cu. When high levels of both ZnDTPA and MnDTPA were applied, there was additive‐type toxicity.