Effect of Boron Source and Rate Addition on Potato Growth Performance and Tuber Quality

Given the biological functions of boron, the narrow safety margin between its deficiency and toxicity, and the multiplicity of its available sources, there is a need to evaluate the most appropriate and safe forms and optimal boron concentrations for potato production. Therefore, this study was conducted via a split-plot design to investigate the effect of different boron sources (Dipotassium octaborate, boric acid, boron ethanolamine) as main factor and application rates (0, 50, 100, 150 mg B L-1) as sub main factoron the growth and quality of potato plants under field conditions. The obtained results show clear differences between the studied sources and rates. For example, boron ethanolamine achieved the highest values of leaves fresh weight significantly surpassing the other sources, while boric acid recorded the highest values of plant height. Regarding tuber traits, boron ethanolamine markedly increased its content of N and Mg, while boric acid led to the highest P content in tuber. On the other hand, the dipotassium octaborate led to higher K and Ca accumulation compared to the other B sources. Concerning the studied rates, 50 and 100 mg B L⁻¹ generally improved N and P contents compared to the control, while 150 mg B L⁻¹ tended to level off or decrease these parameters. Additionally, boric acid improved carbohydrate content, while dipotassium octaborate increased starch content. Overall, the B source and its application rate affect nutrient composition and quality traits, thus the careful selection of B source at suitable rate can support sustainable potato production.