Field Trial - Potato (Van der Plank), Koot Klaasen Boerdery, Plot H49, Loskop Scheme, South Africa

Date/Datum September 98 - December 98
Product/Produk Yield-Plus
Crop/Oes Type/Tipe Potato
Variety/Varieteit van der Plank
Locale/Plek Koot Klaasen Boerdery, Plot H49, Loskop Scheme
Rainfall/
Reenval
Winter/
Winter
  Summer/
Somer
Ave. mm pa/
Gem. mm pj
 
Soil quality/
Grond gehalte
Excellent/
Uitstekend
  Good/
Goed
Medium/
Gemiddeld
  Poor/
Arm
 
Normal weather conditions/
Gewone weerstoestande
 
Test period weather conditions other than normal/
Toets periode weersomstandighede buitengewoon
Strong wind and hail before the third spray
Cooperator/Samewerker Mr Johan Lombard
Type of trial/Proeftipe Commercial field trial
Experimental design/
Proefnemings ontwerp
Two treatments and a control
1. 600 ml/ha
2. 400 ml/ha
3. Control
Five areas treated
Treatments/Behandelinge 1. 68 days after planting - 22 September 1998
2. 82 days after planting - 6 October
3. 96 days after planting - 20 October
Additional 50 kg/ha nitrogen was applied to the treated areas between the second and third treatment (12 October)
Applications/
Toedienings
Qty/Hoeveelheid Three
Form/Vorm Full spray
Counts/Tellings Yield and grading (I&J potatoes)
Results/Uitslae
 

Yield

Grading

   

Large

Medium

Small

Treatment

Yield

%

kg

%

kg

%

kg

%

1. 600 ml

26860kg

127

16025

60

6930

26

3905

14

2. 400 ml

23850kg

112

9063

38

12163

51

2624

11

3. Control

21220kg

100

9125

43

10398

49

1497

8

Conclusion/Gevolgtrekking 1. Significant increase in yield from the treated potatoes (27% with 600 ml/ha)
2. More large grade potatoes with an increased weight; 60% large grade vs 43% of the control. Tuber weight 454 kg vs 356kg.
3. The 400 ml Yield-Plus showed a similar tendancy.
Special comments/
Spesiale opmerkings
1. The large grade potatoes treated with Yield-Plus were significantly bigger than those of the control.
2. Additional nitrogen is essential for the treated potatoes.
3. Increased sugar content and shelf life was noted.
Notes/Notas Test done by L Ueckerman, Mpumalanga Agri-Konsult BK

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