| 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 |
ü |
Ave.
mm pa/
Gem. mm pj |
|
Soil quality/
Grond gehalte |
Excellent/
Uitstekend |
|
Good/
Goed |
ü |
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 |