Appraisal of Micronutrient Impact on Absorption of Macro- and Micronutrients in Tellar Cultivar of Soybean

Abstract

<p>In order to study the effects of applying the micronutrients zinc, boron, and manganese (which are added to the soil and sprayed on the crop) on the absorption of the macro- and micronutrients in soybean seeds, an experiment was carried out using the factorial design with the two factors of adding the micronutrients zinc, manganese, and boron to the soil and spraying them on the crop, with 16 treatments and four replications (a total of 64 trials). On the basis of the soil test which had been conducted, the required amounts of the micronutrients (40, 30, and 10 Kg.h of zinc sulphate, manganese sulphate, and boric acid, respectively) were added to the soil before seeding. In the spray treatments, zinc and manganese (0.30 %) and boron (0.20 %) were sprayed on the crop at the start of stem elongation a d at flower bud formation. Results of the comparison of the means showed that the highest concentration of nitrogen (6.65 %) and phosphorous (0.18 %) in the seeds were obtained when zinc was sprayed on the crop, the highest potassium concentration in the seeds (0.92 %) was achieved when manganese was added to the soil, and the highest zinc concentration in the seeds (52.5 ppm) was observed when zinc was applied to the soil. These results also indicated that, among the treatments of spraying the micronutrients on the crop, the highest manganese concentration in the seeds (24.77 ppm) was obtained when manganese was sprayed on the crop, that the highest boron concentration in the seeds(46.58 ppm) was achieved when boron was added to the soil (and that this boron treatment had a statistically significant difference with the others). Comparison of the interaction effects of the data showed that the highest seed nitrogen concentration (6.72 %) was observed when zinc was sprayed on the crop, that the highest seed phosphorous concentration (0.22 %) was obtained when boron was added to the soil, that the highest seed potassium concentrations (0.93 % and 0.94 %) were achieved when zinc and manganese were sprayed on the crop, respectively, that the highest seed zinc concentrations were observed by adding manganese to the soil plus spraying zinc on the crop (55.33 ppm) and by adding zinc to the soil plus spraying zinc on the crop(55 ppm), that the highest seed manganese concentration (23.67 ppm) was obtained by adding zinc to the soil plus spraying manganese on the crop or by adding manganese to the soil plus spraying boron on the crop, and, finally, that the highest seed boron concentrations (44 and 41.67 ppm) were achieved by spraying boron on the crop and by adding manganese to the soil plus spraying boron on the crop, respectively.</p

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

“…However, we cannot explain the high level of manganese in leaves during the flowering stages [32]. In spite of the importance of macro-and micro-elements [13][14][15][16][17][18][19][20][21] for soybean growth and development, further research is needed to understand the mechanisms controlling the relationships between chelating agents and nutrient uptake by plants and the relationships between chelating agents and nutrient deposition in the seed. Altering the composition of soybean seed with applications of CA, SA, *Means given within a column with the same letter are not significantly different at p ≤ 0.05.…”

“…A strong metal ions-EDTA complex is made, and this is due to the EDTA-binding constant, 10 [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] , which varies depending on the type of metal ions. Citric (10 2.8-11.85 ) and salicylic acids (10 2.7-16.35 ) weakly bind with the metal ions.…”

“…Our hypothesis was that the plants may absorb the naturally occurring low binding (10 3-16 ) citric and Salicylic acids as chelating agents for metal ions over EDTA, which have higher binding constants (10 [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] ) to different metal ions [23] for transporting iron and other micro-and macro-nutrients into the plants. Our hypothesis was based on the fact that metal ions (M) bind differently to different chelating agents (called also ligand, L), and form metal-ligand complexes (ML).…”

“…Although using synthetic chelating agents helped to understand plant nutrition, the micronutrient carrier from soil to plants [12] and the uptake of iron-chelating agents by plants are still not fully understood. Application of micronutrients is important for soybean yield and seed quality, especially in nutrient-deficient soil [13][14][15][16][17][18][19][20][21]. Iron is critical for chlorophyll formation, photosynthesis, respiration [21].…”

The Effects of Essential Minerals in Different Cations and Anion Forms on Assimilation of Macro and Micronutrients in Soybean Leaves

“…Under certain conditions, nutrients especially in their cation form can be tightly bound to the soil which again can limit their availability to the plants. Applications of mineral fertilizer or biofortification are considered complementary approaches to the conventional breeding [4] [5] [6] [7]. Nutrient management and biofortification are great agricultural tools to combine high yield with high nutrient density (protein, minerals and vitamins) at low cost as adapted by farmers [8] [9] [10].…”