IRON NUTRITION OF PLANTS AT HIGH pH

Similarities and Differences in the Acquisition of Fe and P by Dicot Plants

“…To our knowledge, the first results suggesting P as a factor in aggravating Fe chlorosis were presented by De Kock [58], who found a high P/Fe ratio in chlorotic leaves of different plant species. Brown et al [156] observed that HCO 3 − increased P availability in soil and its intake by the plant, which negatively affected Fe acquisition.…”

“…In addition, increased accumulation of Fe in leaves under P deficiency and of P under Fe deficiency has been found [14,37,56,[58][59][60][61][62]. Moreover, P fertilization excess may cause Fe chlorosis in calcareous soils [63,64].…”

Some Relationships Between the Production of Carbon Dioxide by Roots and Lime Tolerance of Fruit Trees and Grape Vine Hybrids

“…In the latter case it might be expected that any respiration-enhancing factor, like O2, would induce or increase the degree of chlorosis. It has indeed been found that increased 02 pressures in the nutrient solutions increased the degree of chlorosis (1,7). In addition, increasing O.2 pressures in the soil also induced chlorosis and it wvas possible to vary the degree of the chlorosis in certain grasses bv varying the 02 pressure (R. MTokadi, unpublished).…”

Kulturversuche mitGloeotrichia echinulata (J. E. Smith) P. Richter

“…Probleme der EisenernShrung in basischen Medien wurden bereits an anderen Stellen besprochen [7,24]. Gloeotrichia-Kulturen, die Eisen als Zitrat-Zitronens~ure-System enthietten, erschienen gelegentlich blasser pigmentiert als solche, in denen die gleiche Eisenmenge mit Versenediol (N,N'-DihydroxySthyl~ithylendialninodiessigs~ure) cheliert geboten wor- In der Serie A zeigten nach 9 Tagen die Algen bei pH 9 und die Kontrollkulturen mit dem Standardmedium Nr.…”