Estate Crops News – Coloured cotton has been used since 3400-2300 BC. Historically, it has been used prior to allotetraploid cotton which are now planted (G. hirsutum dan G. barbadense) of which some have brown and green fiber. The use of coloured cotton is environmentally friendly, and the demand for it will be increasing in relation with the increased demand of organic cotton.
The research was aiming to evaluate of Productivity, Fiber Fineness, and Tolerance to Insect Pests ofF7 promising cotton lineswith brown fiber for the development of national cotton new varieties with brown fiber. The experiment was carried out at Pasirian Experimental Station at Lumajang on Januari-December 2013. 14 F7 lines resulted from 2006 crosses and two control varieties were tested in Randomised Blocked Design. There were two unit tests, the spray and unspray test, each was replicated three times. Plot size was 3 x 10m2 with plant spacing was made of 100 x 25 cm in which one single plant per hole was maintained. Observation was done on growth and generative components, seed cotton yield, and field tolerance component. Experimental result showed that line 06063/5 was consistently shown high seed cotton yield under spray (2348,3 kg/ha) and unspray conditions (2372,8 kg/ha). Under unspray condition, there were four promising lines which were yielded higher that the best control varieties (Kanesia 10, 2197,2 kg/ha), i.e. 06063/5 (2372,80 kg/ha), 06067/3 (2235,0 kg/ha), 06062/3 (2255,60 kg/ha), and 06066/2 (2383,90 kg/ha). In addition, the best line showingthe highest field tolerance index was 06066/2 (110,5%). There were only two lines which had fiber length of ≥ 1 inch (25,4 mm), i.e. 06067/4 and 06062/1. It terms of fiber strength, genetic improvement achieved was ranging from 0,81 to 11,54% better than Kanesia 10, but 8,11 – 17,64% worse than Kanesia 8. Nine lines which had their fiber fineness 3,0 -3,8 mic which are met the industry’s demand.
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