Grower: Jayson Austin

Variety Yield
% of Sicot 71B Staple
Manual Class Micronaire Strength
Sicot 71B 10.66 4.32 100.0 1.2 38 21-3 4.7 30.9 39.6 82.7
DP 408BGII 10.51 4.25 98.5 1.2 38 31-3 4.9 31.4 37.9 82.8
Sicot 80B 9.56 3.87 89.7 1.19 38 21-3 4.8 30.7 36.7 82.7
Sicot 289B 9.55 3.86 89.5 1.17 37 21-3 4.8 30.2 37.2 81.7
Sicala 350B 8.60 3.48 80.6 1.27 41 31-3 4.6 32.6 35.7 85.1
Year2006 Trial TypeN/A Trial DesignRCB x 4 Reps Balance of FieldSicot 71B
Planted05/10/05 Picked06/03/06 Previous CropCotton Established MethodPre-Irrigated
Plant Stand/m10.0 Rainfall (defoliation mm)355 Incrop irrigations9 Soil applied insecticideNo
Nitrogen (kg/ha N)307 Phosphorus (kg/ha P)16 Potassium (kg/ha K)15.0 Zinc (kg/ha Z)0.0
Heliothis sprays0 Insect sprays3 Pix applied (L/ha)1.0 Days to defoliation132

An outstanding trial result in an extreme year. The new Sicot 71B has shown its potential under hot growing conditions, producing excellent yield and fibre quality. It deserves to be the first choice Bollgard IIᆴ variety for the Dawson-Callide. Sicot 80B has a good track record with an attractive all round yield ヨ fibre quality package, to serve as its companion variety.

Trial was planted into a pre-watered back to back field on 5th October. A stand of 10 plants/m was obtained from planting of 13 seeds/m. The field received 300 mm of well distributed rain from planting to mid December, but very little after that. 100 mm just after emergence did create some early waterlogging problems. First irrigation occurred 42 days after planting. There were nine incrop irrigations, averaging 0.71 ML/ha, for a total of 6.45 ML/ha, plus 1.1 ML/ha for the pre-watering. Most irrigations were made in 6 hour shifts in the 880 m long field. The prolonged heat during late December and January resulted in the last six irrigations averaging 7-8 days apart. Dry conditions at the end resulted in no boll rot, despite it being a big crop ranging across the varieties from 1.2 ヨ 1.5 m height, 23 ヨ 24 nodes.

Fertilizer program included a pre-plant mix of 183 units N, 16 units K with 50% under the hill, 50% near surface, water run N with every irrigation, plus some additional spread fertilizer. Total applied N for crop was 300 units, but early waterlogging would have caused losses.

Insect control included two Regent sprays for mirids, plus a Pegasus for SLW. A single Pix application was made late December, possibly a little late. Two defoliation passes, six days apart, in mid February.

Overall management of this crop was at a very high level, and the extreme heat during peak flowering was the main limiting factor in the final yield achieved. Crop reached 9 NAWF at first flower, and maintained first position retention >80% right through flowering.