Interactions Between Potassium and Calcium in Their Absorption by Intact Barley Plants. I. Effects of Potassium on Calcium Absorption

Quantifying the effects of hydroponic systems, nutrient solution, and air temperature on growth and development of basil (Ocimum L.) species

“…Though Ca concentrations declined with increasing EC, nearly all Ca concentrations across species and ECs were within the recommended ranges. We postulate that the decreasing Mg and Ca concentrations in basil may be due to the antagonistic relationship between K, Mg, and Ca (Dibb and Thompson, 1985;Johansen et al, 1968). Fageria (1983) reported that Mg and Ca uptake is diminished with increasing K fertilization, agreeing with the results of our study.…”

Interaction Between Potassium and Calcium in Their Absorption by Intact Barley Plants. II. Effects of Calcium and Potassium Concentration on Potassium Absorption

“…Inhibitory effects of Ca on K absorption from dilute K concentrations have been shown to be temporary: they have been attributed to an effect of Ca in decreasing the permeability of cellular membranes (3). In short-term experiments with intact plants, K absorption and transport into the tops have been related to the dual mechanisms of K absorption postulated for excised roots (13 (10).…”

“…Rates of K absorption per gram fresh weight of roots were calculated between successive harvests using \Villiams' formula (22) which makes allowanice for increasing root weight as described in the previous paper (10).…”

Foliar sprays of NPK fertilizers induce systemic protection againstPuccinia sorghi andExserohilum turcicum and growth response in maize

“…sium ions acted via a non-specific mechanism in which balance between the elements might have affected either the hosts' resistance or susceptibility to NLB or common rust. Interactions between potassium and calcium in their absorption by intact barley plants showed that high potassium levels might reduce calcium absorption through the roots [Johansen et al, 1968]. However, it seems that foliar spray of KH2PO4 had no effect on the total elemental concentration of Ca in the dry tissue of the upper leaf (6 or 7) of the control plants but had stabilized Ca content in both the protected (induced) and challenged plants as compared with the control inoculated plants at 72 h after inoculation (Figure 7).…”