chlorophyll-a and ferrous-sulfate

Topics: Antioxidants; Chlorophyll; Culture Media; Edetic Acid; Ferric Compounds; Ferrous Compounds; FMN Reductase; Hydrogen-Ion Concentration; Iron; Pentetic Acid; Photosynthesis; Plant Leaves; Plant Roots; Plant Stomata; Sorbus; Time Factors

Recycling of organic byproducts for use as soil amendments or fertilisers may enhance the productivity of soils. The aim of this study was to investigate the potential of sugar beet vinasse to correct iron chlorosis in crops when applied in conjunction with Fe fertilisers such as vivianite and ferrous sulfate (FS). An experiment involving two factors (Fe source and dialysed sugar beet vinasse (DBV) rate) was performed using white lupin (Lupinus albus L.) and calcareous sand as growing medium.. Although vivianite provided lower chlorophyll contents than Fe-chelate, dry matter production was not significantly different between the two Fe sources. Vivianite was more effective than FS in preventing iron chlorosis in white lupin, but not when DBV was applied. DBV significantly increased chlorophyll content in plants treated with FS after 3 weeks of growth.. DBV increased the effect of FS in preventing iron deficiency chlorosis in white lupin. This was due, at least in part, to the inhibition of the precipitation of Fe oxides by organic compounds and to the increase in the content of Fe complexed by organic compounds in the growing medium, as revealed by sequential Fe fractionation.

Topics: Beta vulgaris; Chlorophyll; Crops, Agricultural; Dialysis; Dietary Sucrose; Ethylenediamines; Ferrous Compounds; Fertilizers; Food-Processing Industry; Industrial Waste; Iron; Lupinus; Phosphates; Plant Components, Aerial; Silicon Dioxide; Time Factors

We have performed an in situ test of the iron limitation hypothesis in the subarctic North Pacific Ocean. A single enrichment of dissolved iron caused a large increase in phytoplankton standing stock and decreases in macronutrients and dissolved carbon dioxide. The dominant phytoplankton species shifted after the iron addition from pennate diatoms to a centric diatom, Chaetoceros debilis, that showed a very high growth rate, 2.6 doublings per day. We conclude that the bioavailability of iron regulates the magnitude of the phytoplankton biomass and the key phytoplankton species that determine the biogeochemical sensitivity to iron supply of high-nitrate, low-chlorophyll waters.

Topics: Arctic Regions; Atmosphere; Biomass; Carbon Dioxide; Chlorophyll; Chlorophyll A; Diatoms; Ecosystem; Eutrophication; Ferrous Compounds; Iron; Nitrates; Pacific Ocean; Phytoplankton; Seawater; Silicates