Dosages and frequency of potassium nitrate application on the Rangpur Lime and Cleopatra mandarin seedlings growth

Abstract

The objective of this work was to evaluate the effects of dosages and frequency of potassium nitrate application on the growth of citrus rootstocks cultivated in containers. Three frequencies of application (one, two and three times per week) of four rates of KNO₃ (0.15; 0.30; 0.45 and 0.60%) plus a non-fertilization control for each rootstock, were tested. The KNO, addition improved shoot and root growth of both rootstocks, but caused a negative growth effect, including a leaf bum, when applied three times per week. The maximum plant growth value was obtained using 0.45% KNO₃ dosage: applied weekly, for the Rangpur Lime, and using 0.45% KNO₃ rate applied two times a week, for the Cleopatra mandarin.