YIELD AND YIELD CONTRIBUTING CHARACTERS OF COTTO AS AFFECTED BY GENOTYPES AND SHADING WITH JACKFRUIT TREES IN MADHUPUR TRACT OF BANGLADESH

Abstract

A field experiment was carried out at the Central Cotton Research, Training and Seed Multiplication Farm at Sreepur, Gazipur during the period from August 2005 to March 2006 to evaluate the performance of five cotton genotypes in regard to yield contributing characters and yield of seed cotton at different distances from the base of jackfruit tree. The experiment was laid out in Complete Randomize Design (concentric rows of crop at different distances around single tree with five cotton genotypes) with four replications. Cotton genotypes i.e. CB-8, CB-9, CB-3, CB-IO and SR-05 were considered as factor A and distances of cotton genotype rows from jackfruit tree were (1m, 2m and 3m distance from tree base) considered as factor B. Cotton genotypes responded differently in terms of all studied parameters due to variation of distances from the tree base. Yield attributes of cotton genotypes i.e., number of boll per plant, boll length, boll diameter, boll weight and seed cotton yield were found better under open field condition. Among the genotypes, SR-05 produced significantly the highest seed cotton yield under open field condition which was followed by CB-IO, CB-3 and CB-9. Among the three distances, the farthest distance (3 m from tree base) gave higher yield. At this distance (3 m), CB10 genotype gave higher yield followed by CB-3 and SR-05 genotypes. At middle distance (2 m), CB10 genotype produced higher yield, which was identical to SR-OS. At the closest distance (I m from the tree base). CB-I 0 produced the highest seed cotton yield, which was identical to SR-OS. Interestingly, CB-8 produced the lowest yield at all distances from the tree base. The study revealed that the entire tested genotypes produced higher seed cotton yield under open field condition, while yield recorded at the partial shade provided by jack fruit was lower, but yield recorded at the farthest distance (3m) except CB-8 genotype was comparable or even higher with regard to national average.