Impact of varieties and delinting methods on growth, yield and quality of cotton (Gossypium Hirsutum L.) lint and seed
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Date
2006
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Sokoine University of Agriculture
Abstract
Two experiments were conducted at Agricultural Research Institute Ukiriguru, Mwanza,
Tanzania to evaluate the effectiveness of cotton varieties and cottonseed-delinting methods
on seed quality, growth, yield and quality of lint and seeds. A completely randomised
design (CRD) experiment with four replications to assess cottonseeds quality of three
cotton varieties (UK77, UK 82 and UK 91) delinted mechanically, by using concentrated
(98%) sulphuric acid, dilute (49%) sulphuric acid, Tanzania Cotton Lint and Seed Board
[TCLSB] sulphuric acid methods and non-delinted seeds applied as a control giving 15
treatment-combinations was conducted. A randomised complete block design (RCBD),
with a split-plot field experiment replicated four times with similar treatment-combinations
was conducted to determine their effectiveness on cotton crop growth, yield and quality of
lint and seeds. The crop was sown at two-rows, 45 cm apart on either side of a 1.5 m ridge
with six seeds per hill 45 cm apart, which were later on thinned to two plants 35 days after
planting. Data on seed quality, crop growth, yield, lint and fibre quality were collected and
analysed. Laboratory experimental results obtained indicated that seed quality (germination
percentage) was significantly affected (P <0.001) by the treatments applied; best quality
being from the use of concentrated (98%) sulphuric acid. Growth and development
variables were not significantly affected (P <0.05) by the treatments used, yield of seed
cotton and lint were significantly affected by the cotton-varieties at P <0.05 and the
interaction effects (P <0.001) of varieties x delinting methods used. Fibre quality was also
significantly affected (P <0.05) by the treatment interaction-effects. Based on these results,
for best cotton-seed quality, optimum seed-cotton and lint yield, and fibre quality, farmers
should use delinted UK 91 and UK 77 cotton-seed varieties by using concentred (98%)
sulphuric acid or TCLSB sulphuric acid methods.
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Keywords
Cotton, Gossypium Hirsutum L.