Interaction between beet vinasse and iron fertilisers in the prevention of iron deficiency in lupins.
BACKGROUND
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.


RESULTS
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.


CONCLUSIONS
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.
de Santiago
Ana
A
Dpto Ciencias Agroforestales, EUITA, Universidad de Sevilla, Ctra Utrera Km 1, E-41013 Sevilla, Spain. adesantiago@us.es
Delgado
Antonio
A
D027461:Beta vulgaris / Q000737:chemistry*; D002734:Chlorophyll / Q000032:analysis; D018556:Crops, Agricultural / Q000737:chemistry / Q000191:economics / Q000254:growth & development*; D003956:Dialysis; D019422:Dietary Sucrose; D005029:Ethylenediamines; D005296:Ferrous Compounds; D005308:Fertilizers / Q000032:analysis*; D005525:Food-Processing Industry / Q000191:economics; D007220:Industrial Waste / Q000032:analysis* / Q000191:economics; D007501:Iron / Q000032:analysis* / Q000737:chemistry; D031297:Lupinus / Q000737:chemistry* / Q000254:growth & development*; D010710:Phosphates; D035261:Plant Components, Aerial / Q000737:chemistry / Q000254:growth & development; D012822:Silicon Dioxide; D013997:Time Factors
D019422:Dietary Sucrose; D005029:Ethylenediamines; D005296:Ferrous Compounds; D005308:Fertilizers; D007220:Industrial Waste; D010710:Phosphates; D002734:Chlorophyll; C020748:ferrous sulfate; D012822:Silicon Dioxide; C055242:iron-ethylenediamine-N,N'-bis(2-hydroxyphenylacetic acid); C518753:ferrous phosphate; D007501:Iron