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New Zealand Journal of Forestry Science

Table 2 [ 32 P] phosphorous acid uptake into Pinus radiata using various rates of the organosilicone-blend superspreader adjuvant (Du-Wett®) at two harvest times

From: The use of adjuvants to improve uptake of phosphorous acid applied to Pinus radiata needles for control of foliar Phytophthora diseases

Treatment no

Adjuvant concentration (%)

Harvest time HAT

[32P] uptake (%)

[32P] uptake dose* (kg ha-1)

2R#

none

24

3.5 d

0.42

8R#

0.20

24

43.6 abc

5.23

9

0.05

24

31.8 c

3.82

10

0.10

24

33.6 bc

4.03

11

0.10

72

47.3 ab

5.68

12

0.20

72

51.6 a

6.19

  1. Phosphorous acid was applied at the equivalent of 12 kg ha-1 in all treatments. Means sharing common postscripts are not significantly different.
  2. #The postscript R indicates a repeat treatment.
  3. *Nominal dose calculated as (phosphorous acid rate x %_uptake).
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