Guideline Values For Evaluating Soil Test Results; Floriculture Plants Under Glass - PRONOVA Stelzner pH AGRAR 2000 Technical Instructions

Na (H O), overall
2
Na (H O) for azaleas, ericas, boggy soil
2
Cl (H O), overall
2
Cl (H O) for azaleas, ericas, boggy soil
2
Plant compatibility
Weed density
Source: Rolf Röber/Henning Schacht, Plant Nourishment for Horticulture
Publisher: Eugen Ulmer KG, In Stuttgart-Hohenheim, Germany, Tab. 77, p. 154

6.3 Guideline values for evaluating soil test results

Floriculture plants under glass

Mg/l substra-
tum in accor-
dance with Nitrogen (N)
VDLUFA nu-
trient needs*
Salt tolerance
I = low
II = middle
III = high
Trace nutrients
Optimal ranges
mg/l
*) For crops, refer to the large Table 5.5.
Phosphate and potassium
The lower values in the optimal ranges are
valid for young plants, for irrigation fertiliza-
tion and for ripening and dormancy periods.
The upper values in the optimal ranges are
valid for potted or containerized plants
during the high-growth period and for stock
(mother) plants.
Phosphate
(P O )
2 5
Indicatory Indicatory
ranges ranges
70 –140 50 – 100
140 – 280 100 – 200
280 – 420 200 – 300
Iron Manganese
(Fe) (Mn)
10 – 50 5 – 40
< 100 mg/l
< 35 mg/l
< 200 mg/l
< 100 mg/l
Free of substances which could be harmful to
plants, according to seedling test
No more than one germinating seed or living
plant per litre of substrata.
Potassium Magnesium
(K O) (Mg)
2
Indicatory Indicatory
ranges ranges
100 – 200 30 – 60
200 – 400 60 – 120
400 – 600 120 – 200
Copper Boron
(Cu) (B)
3 – 10 0,5 – 1,0
When using slow-release fertilizer, only an
inexact measure of concentration (NPK)
is possible. For bedded plants, normally no
growth problems will result when the optimal
phosphate ranges are exceeded. However
for phosphorus concentrations over 800 mg/l
for potted plants and 1500 mg/ l for bedded
plants (for example, roses or gerbera), it is
possible that there is an induced scarcity of
a trace element.
Salt content
Indicatory
ranges
500 – 1000
1000 – 2000
2000 – 3000
Zinc Molybdenum
(Zn) (Mo)
1 – 5 0,1 – 2,0
49
GB