NO - Besoin d'assistance

Composition of tomatoes and tomato products in antioxidants (WG1) page 30
__________________________________________________________________________________________
Ca concentration, possibly due to the simultaneous reduction in potassium absorption because
of competitive effect between the two cations.
Effect of combined Nitrogen-Phosphorus-Potassium and others
Some studies indicate an influence of combined fertilizers on fruit lycopene content.
Bagal et al.(1989) obtained higher lycopene content (cultivar Pusa Ruby) with combined
nitrogen, phosphorus and particularly potassium application (Table 8). Lycopene content
increased even when expressed in relation to soluble solids. Increasing supply of phosphorus
together with nitrogen might result in a decrease in lycopene content. But in this experiment
the cultivar was ancient, it is surprising that °Brix largely varied while fruit moisture
remained constant and, moreover, the values of lycopene content were so low that there might
be a unit error or the data are not reliable. Lacatus et al.(1994) also found that increasing
nitrogen supply (100, 200, 300 kg/ha) combined to various rates of phosphorus (75 and 150
kg/ha) or of potassium (75 and 150 kg/ha) or of half-fermented organic manure (20, 40, 60
t/ha) influenced positively the fruit lycopene content in average : from 61.8 mg/kg fresh
matter for 100N and 200N to 66 mg/kg fresh matter for 300N. But the cultivar used is not
well known.