Abstract:
A field study was conducted at Cotton Research Training and Seed Multiplication Farm,
Sreepur, Gazipur from July 2011 to February, 2012 to investigate the influence of
different levels of fertilizer on a number of hybrid and inbred varieties of cotton in
respect of growth, yield components and yield, and fibre quality attributes. The
experiment comprised three cotton genotypes (i) HSC-4 (hybrid), (ii) DM-2 (hybrid) and
(iii) CB-12 (inbred) variety and five levels of fertilizers (i) Control (without fertilizer),
(ii) 25% less than recommended dose, (iii) Recommended dose (RDF: 120, 52,
131,27:N,P,K,S kgha
-1
), (iv) 25% higher than recommended dose and (v) 50% higher
than recommended dose. The experiment was laid out in a Randomized Complete Block
Design (factorial) with three replications. The results revealed that seed cotton yield,
bolls plant
-1
, ginning out turn differed among the varieties. The highest seed cotton yield
and ginning out turn were obtained in hybrid HSC-4 and that of the lowest received from
CB-12 variety. Increasing levels of fertilizer maintained higher values of all the
parameters except days to first flowering, lint index and ginning out turn. The tallest plant
(111cm) and maximum days to boll opening (129.3), number of no. of bolls plant
(27.08), seed cotton yield (2174 kg ha
- ii -
-1
), lint yield (953kgha
-1
), seed index (9.49), staple
length (1.2inch), micronaire value (4.3), fibre strength (83.70 psi), uniformity ratio (48%)
were observed in the plot where 50% higher than RDF was applied. Plant height,
bolls plant
-1
, individual boll weight, lint yield and ginning out turn showed higher value
with the interaction of HSC-4 x 50% higher than RDF. The highest seed cotton yield
(2406 kg ha
-1
) Gross return (144360 tk ha
-1
) Gross margin (75358tk ha
), BCR (2.09)
and seed index were obtained with the combination effect of CB-12 x 50% higher
fertilizer than RDF. For economic point of view, the results indicate that CB-12 inbred
variety x 50% higher fertilizer than RDF was more profitable than any of the other
treatment combinations.
Description:
A Thesis
Submitted to the Faculty of Agriculture
Sher-e-Bangla Agriculture University,Dhaka
in partial fulfilment of the requirements
for the degree
of
MASTER OF SCIENCE (MS)
IN
AGRONOMY
SEMISTER: JANUARY-JUNE,2012
