Abschlussbericht Projekt: „Verminderung der ... - BLE

Table 2 Concentration of selected nutrients (mg kg -1 FW) in potato tubers differing in their
blackspot susceptibility irrespective of cultivar, vegetation period and time of storage in
comparison to published data of these nutrients (mg kg -1 FW) in potato tubers irrespective
of cultivar, vegetation period and time of storage
Nutrient Present study Literature data
Minimum Maximum Mean σ x Minimum Maximum Mean σ x Reference
Se 0.17 0.68 0.30 0.17
B 0.45 1.86 0.94 0.20 0.2 1.1 0.65 0.64 1
Fe 3.83 21.94 9.58 2.49 3 22 7.48 7.2 1, 4, 5
Ca 11.79 980.74 101.55 60.11 18 65 41.40 18.66 1, 3, 4
Mg 102.98 517.84 145.29 89.60 124 278 213.2 57.59 1, 3, 4
P 111.91 672.99 359.38 109.76 200 479 343.00 139.63 1, 2
K 2626.02 6326.07 4327.86 643.45 3300 5973 4753.25 1266.59 1, 3, 2
σx standard deviation, 1 Davies 1998, 2 Dilworth et al. 2007, 3 Lærke 2001, 4 Putz 1998, 5 Sikora 1999
Table 3 Relative concentration (%) of selected nutrients in potato tubers differing in their
blackspot susceptibility irrespective of cultivar, vegetation period and time of storage in
comparison to the published data of relative concentration (%) of these nutrients in potato
tubers irrespective of cultivar, vegetation period and time of storage (sum of means of absolute
data=100 %)
Nutrient Fresh weight (%)
Present study Literature data calculated 1
Se 0.01 n.a.
B 0.02 0.01
Fe 0.19 0.14
Ca 2.05 0.77
Mg 2.94 3.98
P 7.27 6.40
K 87.52 88.69
1 the absolute nutrient concentrations published by Putz 1998, Lærke 2001, Davies 1998, Dilworth et al. 2007 and Sikora
1999 were used for calculation; n.a. not available
To study the influence of this high Ca concentration on other tuber nutrients the ratio between
macro (K, Ca and P) and micro (B, Fe) nutrients was calculated according evaluations
of Bergmann (1993). There were some ratios of macro:micro nutrient concentrations
available, whereby the ratio 240:1 indicated an optimal supply, the ratio 1200:1 revealed
micro nutrient deficiency and the ratio 7:1 micronutrient toxicity (Bergmann 1993). Applying
these observations to the given results, an unbalanced K/B ratio was indicated; irrespective
of the high Ca concentration (Tab. 1).
172