Effect of Foliar Application with Potassium Humate on Growth and Uptake of some Nutrients by Wheat and Broad Bean Plants

摘要

ACOMPLETELY randomized green house experiment with five replicates for each treatment was conducted during 2006 to evaluate the effect of potassium humate (KH) as foliar spray by concentrations of 50, 75, and 100 ug g"1 at different stages of growth i.e. one spray after 21 days and two sprays after 21 and 45 days from planting on plant growth and uptake of some nutrients by wheat and broad bean plants. The dry matter yield of wheat and broad bean plants (after 80 days from plantation) was significantly increased with increasing the concentration and number of sprays of KH; excluding broad bean at one spray, where the increment was insignificant. The content and uptake of N, P and K by both plants significantly increased with increasing KH concentration and number of spray excluding phosphorus at one spray. The same was true with micronutrients (Fe, Mn, Zn, and Cu). Generally, the highest values of dry matter yield, macro-and micronutrients content and uptake by the studied plants were recorded at the rate of 100 mu g g~(-1) KH with two sprays followed by only one spray with the same concentration of KH.