Absorption of Chelated Iron by Soybean Roots in Nutrient Solutions

Abstract

During the past decade, many investigators have studied the uptake of micronutrients when supplied as chelates to plant roots. Considerable controversy has arisen as to whether the metal is dissociated from the organic ligand at the root membrane and is taken up by itself, or whether the entire chelate is absorbed through the root nmembrane. Several

Effects of chelating agents on protein, oil, fatty acids, and minerals in soybean seed

“…In an earlier study on soybean plants grown in nutrient solution, it was reported that the chelating agent was absorbed by plants only when the chelating agent concentration was higher than the metal ion concentration [9]. It was also concluded that chelating agents applied in the absence of iron are absorbed by the plant and bound to the iron in the plant, causing chlorosis [9]. Spraying such plants with FeSO 4 resulted in rapid recovery and chlorosis elimination [9].…”

“…It was also concluded that chelating agents applied in the absence of iron are absorbed by the plant and bound to the iron in the plant, causing chlorosis [9]. Spraying such plants with FeSO 4 resulted in rapid recovery and chlorosis elimination [9]. It was also reported that in nutrient solutions of chelating agent and ferric ion, the roots of kidney beans and soybeans seeds competed with the chelating agents for the ferric ion, and the competitive effect was overcome by adding more metal ion into the nutrient solution [31].…”

“…In the absence of iron (Fe) or when only the chelating agent was present, the plant showed chlorosis. Spraying iron sulfate (FeSO 4 ) solution on the plants resulted in plants' recovery from the chlorosis [9]. Iron movement in the growth medium is reported to be dependent on the chelating agents, pH, and exposure time to ligand [10].…”

“…However, at higher pH or in poor drainage, iron may not be available to plants, leading to iron deficiency [11,12,14,15,[18][19][20]. Combinations of chelating agents can increase iron availability [9,11,12], and thus may improve seed constituents. Studies have reported that the use of citric and oxalic acid on lemongrass resulted in better growth compared to the use of EDTA [22].…”

Effects of Soil Applications of Micro-Nutrients and Chelating Agent Citric Acid on Mineral Nutrients in Soybean Seeds

“…Application of Zn, Mn and B was also reported to increase yield, improving seed quality, and oil [13] [14]. Other studies have also reported that iron-chlorosis symptoms of soybean plants can be reduced by adding a chelating agent with Fe in Hoagland solutions [15] [16]. Although soil contains all nutrients, under certain conditions, these nutrients, especially the cations, can be tightly bound to the soil and also precipitation can limit their availability to the crop.…”