Effect of slow release iron fertilizers on chlorosis in grape
Titel:
Effect of slow release iron fertilizers on chlorosis in grape
Auteur:
Natt, Christine
Verschenen in:
Journal of plant nutrition
Paginering:
Jaargang 15 (1992) nr. 10 pagina's 1891-1912
Jaar:
1992-10
Inhoud:
Iron-EDTA (Fe-EDTA), ferrous sulfate (FeSO4), and a combination of both (50:50) were coated with a natural resin material and tested in a concentration of 75 and 100 mg Fe/kg soil, respectively, for three years in pot experiments with the susceptible grape (Vitis vinifera L.) vine rootstock Couderc 3309. In 1990, two locations in the field were fertilized with coated Fe-EDTA. The application of coated Fe-EDTA increased the iron (Fe) content in the youngest leaves about 10% and the chlorophyll content about 71% compared to the three year average values of the untreated plants. The most obvious effect was a better growth, which resulted in a higher dry weight and a greater Fe uptake in the leaves and shoots. Organic acids decreased about 11% and chlorosis symptoms, as in untreated plants, did not appear. By itself, FeSO4 was only applied in the first year, after which chlorosis symptoms occured. The combination of Fe-EDTA and FeSO4 resulted in an increase of iron content, dry weight, Fe uptake and chlorophyll content and a slight decrease of organic acids. All data except the Fe content were higher by singly applying coated Fe-EDTA. At one location of chlorotic plants under field conditions coated Fe-EDTA (8% Fe), applied in the amount of 15 g and 30 g per plant increased chlorophyll content as well. As no chlorosis occured at the second location chlorophyll and Fe content remained unchanged. It was concluded that coated Fe-EDTA may serve as an Fe fertilizer if the water supply is sufficient.
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