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Subject: Crop Physiology × Author: NIKITA S. PATIL × End date: 2015 × Start date: 2015 ×
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    ThesisItemOpen Access
    ASSESSMENT OF PHYSIOLOGICAL EFFICIENCY OF UPLAND COTTON (Gossypium hirsutum) GENOTYPES DIFFERING IN PLANT ARCHITECTURE
    (University of Agricultural Sciences Dharwad, 2015-06) NIKITA S. PATIL; Dr. B. C. PATIL
    A field experiment was conducted during kharif season of 2014 under rainfed conditions at Agricultural Research Station, Dharwad to study the productivity potential, physiological and biophysical basis of yield variation of different plant types in cotton genotypes. The experiment consisted of twelve cotton genotypes (three in each group) with different spacings [Compact (60 x 15 cm), Semi-compact (60 x 30 cm), Normal (90 x 20 cm), Hybrids (90 x 60 cm)] laid out in randomized block design with three replications on medium black soil. The genotypes selected were based on growth and morphological characters like plant height, number of leaves and branches. Genotypes showed significant differences in their growth pattern, morphological and phonological characters. The compact genotypes DSC-99, DSC- 1301 and DSC-1401 recorded 10-15 per cent more yield per unit area than other genotypes. The compact genotype DSC-99 with more plant density recorded maximum yield (1601 kg ha-1) compared to the hybrids DHH-302 and DHH-1301. This was mainly attributed to its close association with yield components such as number of bolls (r = 0.966) and harvest index. Although total dry weight was noticed on per plant basis in wider spacing (90 x 60 cm) of hybrids and normal varieties (90 x 20cm) as compared to closer spacing (60 x 15 cm and 60 x 30 cm) of compacts and semi compacts, on unit area basis the reverse was the trend. All the growth parameters viz., LAI, LAD, CGR, RGR and NAR except SLW and AGR were higher in closer spacing genotypes as compared to wider spacing genotypes. Correlation studies indicated highly significant positive association of yield with TDM (r = 0.963), boll weight (r = 0.822) and number of boll/plant (r = 0.966). Among the genotypes DSC-99 was comparatively early in phenological characters compared to other genotypes. Thus the results indicated the higher potentiality of compacts genotypes as compared to hybrids or robusts.