Grower: Gus O'Brien

Variety Yield
% of Sicot 746B3F Staple
Manual Class Micronaire Strength
Sicot 748B3F 14.97 6.06 103.0 1.2 38 11 4.4 31.8 41.2 82.5
Sicot 746B3F 14.54 5.89 100.0 1.17 37 11 4.3 31.8 44.0 81.7
CSX3379B3F 14.26 5.77 98.1 1.18 38 11 4.5 31.4 43.3 83.0
Sicot 754B3F 14.18 5.74 97.5 1.22 39 11 4.5 32.3 42.0 83.3
Sicot 714B3F 13.83 5.60 95.1 1.16 37 11 4.5 30.4 41.1 82.2
Year2018 Trial TypeN/A Trial DesignRCBx5 Balance of Field746B3F
Planted07/10/17 Picked03/04/18 Previous CropLong Fallow Established MethodWatered Up
Plant Stand/m12.9 Rainfall (defoliation mm)243 Incrop irrigations10 Soil applied insecticideNo
Nitrogen (kg/ha N)307 Phosphorus (kg/ha P)42 Potassium (kg/ha K)0.0 Zinc (kg/ha Z)2.0
Heliothis sprays0 Insect sprays3 Pix applied (L/ha)1.5 Days to defoliation156

The trial had some variability across the site due to soil types. Three replicates of five varieties were planted including a new Cotton Bunchy Top resistant line listed as CSX3379 B3F. This is one of the first Bunchy Top resistant lines to come through the Cotton Breeding Australia. This variety looked good during the season and it presented well at picking.
Boll counts were up to 144/m across the lines and first position fruit retention was up to 65.9% in the Sicot 714B3F in early March. Plant heights were all around 1.0m.
The crop progressed well after planting on the 7th October 2017 after being watered up. Sicot 748B3F was able to take advantage of the longer season and continue to mature fruit. It yielded well at 14.97 b/h. The Sicot 714B3F finished up earlier and it was ready to pick around 10 days earlier than the others. Fibre quality was good and the Sicot 754B3F showed its good quality with a 39 length.

Soil type variability caused one side of the trial to yield much higher than the other. As a result of this I am a bit sceptical about its reliability.
The field was long fallowed out of chick peas from the 2016 winter. Preparation was ideal with no stubble issues and the usual good seed bed resulting from a chick pea rotation.
The field was watered up on the 10th October and got a heavy 23mm on the 12th which put the entire field under water. The crop emerged well despite this. This field continued to get under storms for the rest of summer despite it being a dry summer throughout the district. There was a total of 243mm effective in crop rain with several of the bigger falls occurring soon after irrigations. The crop did not show any sign of water logging however I suspect the rain events may have impacted the final yields to some degree. Yield data showed much better cotton on the head ditch than the tail drain which could be a result of the big rain events.
Apart from storms and some minor hail damage on the 18th November the crop suffered no other setbacks and picked cleanly on the 3rd of April.
The 714 was ready to defoliate about 10 days before the 748 and could have gone without the last irrigation.