Occurrence and correction of lime-induced chlorosis in petunia plants

Abstract

The effect of various concentrations and ratios of iron (Fe) and manganese (Mn) chelates on growth, micronutrient uptake and chlorophyll content was investigated in a glasshouse experiment using potted petunia plants. The plants were cultivated in a peat substrate amended with dolomitic limestone at rate of 3.0 g/L (control substrate) or 12.0 g/L. The higher rate was established both to restrict the uptake of Fe, Mn and other nutrients and also to test the effectiveness of various Fe and Mn treatments. The plants in all the treatments were fertigated at weekly intervals with a nutrient solution containing macronutrients and micronutrients. Various chelate forms of Fe and Mn were used with the exception of two treatments where these two elements were omitted. The effects of different substrate pH levels (derived from different limestone contents) had a large effect on plant growth, chlorophyll content and content of Fe and Mn accumulated in the plant leaves. The plants in the high-limestone substrate devoid of Fe and Mn had reduced growth and lower chlorophyll content. They also had lower leaf Fe and Mn content than the control plants in the R3 substrate. Regular fertigation with a nutrient solution containing Mn and Fe improved plant growth rate and also increased chlorophyll content. However, its efficiency depended on the chelate form and concentration used. The effect of chelate application on the Fe and Mn leaf content was unclear as it only marginally increased leaf Fe absorption in some treatments. No effect of the various Fe/Mn ratios was observed.

Exogenous nitric oxide alleviates iron-deficiency chlorosis in peanut growing on calcareous soil

“…The occurrence of Fe deficiency symptom is known to be related to the content of calcium carbonate and available Fe form in soil. The reactivity of soil carbonate affects the solubility of Fe and, especially, the concentration of the bicarbonate ion, which is a strong buffer and may neutralize the H + released by proton pumps of the root plasmalemma (Šrámek and Dubský 2011). The FeSO 4 which was added into the CRF and sprayed on leaves was apt to be oxidized.…”

Substitution of peat moss with softwood biochar for soil-free marigold growth

“…Foliar chlorosis in ornamental plants, including marigold, grown in high pH substrates has been induced by liming in peat substrates and could reflect non-N deficiencies such as iron and manganese (Smith et al, 2004;Šrámek and Dubský, 2011). Similar above-ground biomass and total N despite greater relative chlorophyll content in high BC substrates (20-70%, no pH adjustment) by week 9 indicates that initial differences in chlorophyll content by BC substitution did not persist and that initial greater chlorophyll content for marigold in high BC substrates did not necessarily translate to greater biomass and N uptake.…”

Differential responses of green-synthesized iron nano-complexes in mitigating bicarbonate stress in almond trees

“…Stunted growth due to bicarbonate stress, high pH, and Fe deficiency has been previously reported in other plant species [ [46] , [47] , [48] ]. Bicarbonate stress and Fe deficiency may restrict cell division and growth [ 49 , 50 ] by limitation of stomatal conductance, photosynthesis rate, photosystem II efficiency [ 49 ], restriction of the activity of stromal enzymes and prevention of formation of thylakoid membranes in the chloroplasts [ 51 ]. Therefore Fe deficiency-induced growth limitation appears to be a result of reduced photosynthesis activity.…”