Table 1 Soil pH and nutrient concentrations (before fertilization) and N fertilization rates.

From: Pollen beetle offspring is more parasitized under moderate nitrogen fertilization of oilseed rape due to more attractive volatile signal

Year

pH

NO3-N mg/kg

NH4-N mg/kg

P mg/kg

Soil

2013

7.13*

5.1 ± 0.6*

0.02 ± 0.01*

122.5 ± 3.5*

2014

5.6–6.4

302 ± 99.7

215 ± 71.0

603 ± 199.0

Nitrogen fertilization

Ammonium nitrate (NH4NO3), kg ha−1 (number of plant individuals)

2013 VOC

0 (6)

20 (10)

120 (7)

 

2014 VOC

0 (2)

80 (3)

100 (3)

160 (3)

2014 HS

0 (21)

80 (19)

100 (19)

160 (20)

  1. The number of plant replicates measured at each N fertilization treatment is in brackets. Field soil in 2013 contains autumn and spring soil content measurements by lactate extractable method for phosphorus with standard errors. Commercial peat soil in 2014 represents nutrient content from manufactory (as standard deviation was taken dry mass by capacity range).
  2. *values before mixing with sand.
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