Abstract
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.
Highlights
Oil crops are among the important crop plants and their products form a part of daily food for people and feed for stock
Alley et al (2008) reported that manganese absorption by soybean and soybean seed and oil yields increase when manganese is added to the soil and sprayed on the crop; and that manganese deficiency has a negative influence on soybean seed oil content
This study was conducted in the region of Dasht-e-Naz in Sari to investigate the effects of the application of the micronutrients zinc, manganese, and boron on the way macro- and micronutrients are absorbed by soybean
Summary
Oil crops are among the important crop plants and their products form a part of daily food for people and feed for stock. Soybean (Glycine max [Merrill]) is one of the most important oil crops, and it has played an undeniable role in the production of edible oil in our country, especially in the province of Mazandaran. Alley et al (2008) reported that manganese absorption by soybean and soybean seed and oil yields increase when manganese is added to the soil and sprayed on the crop; and that manganese deficiency has a negative influence on soybean seed oil content. Since Mazandaran is the center of soybean production in the north of the country, the study of the way the application of micronutrients (added to the soil or sprayed on the crop) influences the absorption of macronutrients, such as nitrogen and phosphorous and potassium, and micronutrients, such as zinc and manganese and boron, is very important. This study was conducted in the region of Dasht-e-Naz in Sari (in the province of Mazandaran) to investigate the effects of the application of the micronutrients zinc, manganese, and boron (and to compare the effects of their mode of application – i.e., whether they are added to the soil or sprayed on the crop) on the way macro- and micronutrients are absorbed by soybean
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