Goondiwindi

Grower: Hugh Gloster


Variety Yield
(bales/ha)
Yield
(bales/ac)
% of Siokra V-16B Staple
(decimal)
Staple
(imperial)
Manual Class Micronaire Strength
(gms/tex)
Turnout
(%)
Uniformity
(%)
Sicot 80B 2.40 0.97 107.3 1.19 38 31-3 4.9 32.3 35.1 82.8
DP 576BGII 2.35 0.95 104.9 1.13 36 21-3 5.1 30.6 36.0 81.1
Siokra V-16B 2.24 0.91 100.0 1.2 38 31-3 5.0 32.1 32.4 82.9
Sicala 350B 1.74 0.71 78.0 1.25 40 31-3 4.6 33.9 34.3 83.9
Sicot 289B 0.00 0.00 0.0 1.15 37 31-3 5.1 31.5 0.0 81.4
Year2006 Trial TypeN/A Trial DesignRCB x 3 Reps Balance of FieldSicot 80B
Planted09/11/05 Picked09/05/06 Previous CropWheat Established MethodFallow Moisture
Plant Stand/m9.0 Rainfall (defoliation mm)291 Incrop irrigationsN/A Soil applied insecticideNo
Nitrogen (kg/ha N)0 Phosphorus (kg/ha P)0 Potassium (kg/ha K)0.4 Zinc (kg/ha Z)0.8
Heliothis sprays0 Insect sprays3 Pix applied (L/ha)0.0 Days to defoliation145

A great result for this trial given the particularly hot and dry season. In a situation where you may expect staple length to be short and micronaire to be low; the opposite has occurred. Sicot 80B and Siokra V16B have proved to be consistent companion dryland Bollgard IIï¾® varieties commercially in the Goondiwindi region for two seasons, and this trial has highlighted this further. As expected, the Sicala 350B yielded lower than other varieties but the exceptional fibre quality produced in this situation highlights its potential in reducing downgrade penalties in dryland situations. The trial shows there is a great choice of dryland Bollgard IIï¾® varieties for the Goondiwindi area, and this will be enhanced further with the release of Siokra 24B for the 2006-07 season.

Crop was planted into excellent soil moisture resulting from good rainfall throughout October. A shower (19mm) immediately after planting resulted in some soil crusting and herbicide damage in places; however a good stand was achieved across the field. Due to warm temperatures and a number of rainfall events that provided good soil profile moisture, the crop showed excellent vigour throughout December as it reached squaring. Some light hail damage in December caused no damage of consequence.

Temperatures began to soar in late December and while there were storms around, none provided any useful rainfall during this critical period. By early January soil moisture levels were obviously depleting and crop vigour slowed markedly, while by mid January crop development had all but stopped and fruit shed was occurring. The fortunes of this crop were saved however with 75mm of rain on January 18 which allowed the crop to mature a good volume of fruit.

Weed management included Roundup (1.4 l/ha) applied pre-plant, Dual Gold (1.0 l/ha) and Cotogard (2.5 kg/ha) applied at a 50% band with the planter and Diuron (1.1 kg/ha) and Sprayseed (1.6 l/ha) applied between planting and emergence. In crop, 1.5 l/ha Roundup CT was applied with shielded sprayer in mid December and an inter-row cultivation was done during late December to combat fleabane, the only obvious in-crop weed in the field.

The only fertilizer applied was Liquifert Gem (3 l/ha) at planting.

In addition to the other trial varieties, Sicot 289B was planted in wheel tracks (24m spacing) so that the remainder of the varieties could be replicated at planting. Due to the large negative impact the wheel track had on growth in these plots, the yield of Sicot 289B have been omitted from the reported data. It yielded approximately 0.75 bales/ acre, with staple length of 37 (32nds inch), micronaire of 5.1 and strength of 31.5 grams/tex.

The field was defoliated on 3 April 06 (Dropp @120 ml/ha) with a second application 15 days later (Dropp @120 ml/ha). Due to a lot of unopened bolls, a third application was made to the Sicala 350B and some other areas of the field (not in trial).