Effect of Foliar Application of Nitrogen, Phosphorus and Iron on Growth Characteristics of Apple cv. ‘Golden Delicious’
Summary
Nitrogen, phosphorus, and Fe are essential elements in plants. Alkaline pH, high concentrations of calcium, and bicarbonate ions in calcareous soils stabilize and reduce the solubility of these elements, thus reducing their absorption and transfer from the roots to different parts of the plant. This study was conducted to investigate the effect of nitrogen, Fe and P foliar application on the growth characteristics of ‘Golden Delicious’ cultivar in a randomized complete block design with three replications in 2019. Treatments included foliar application of urea (0, 1, and 2%), Fe (0, 1.5, and 3 g·L-1), and P (0, 16, and 32 ppm), and were applied to 4-year-old apple trees cv. ‘Golden Delicious’. At the end of the study, the length, diameter, number of fruits, leaf chlorophyll content, shoot length, leaf area, plant height, and leaf concentrations of P, Fe, and nitrogen were measured. The results showed that the effect of foliar application of urea on the leaf concentrations of nitrogen, Fe, and P, shoot length, and plant height was effective. The effects of foliar application of P on nitrogen, Fe and P, fruit length, fruit diameter, and leaf chlorophyll were significant. Foliar application of Fe also had a significant effect on the leaf concentration of Fe and N, and these traits increased to 4.74 and 28.07, respectively, compared to the control. The effect of the interaction of these elements on the leaf concentrations of nitrogen, Fe, and P, as well as fruit length, fruit diameter, and shoot length, was significant and increased these traits compared with the control. Based on these results, foliar application of these elements can be recommended as a complementary method to enhance the growth of apple trees cv. ‘Golden Delicious’.
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