STUDIES ON SEED PRODUCTION TECHNIQUES AND STORAGE POTENTIAL IN INTER SPECIFIC COTTON HYBRID DHB-105
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Date
2003
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University of Agricultural Sciences, Dharwad
Abstract
The field experiments to study the seed production techniques in inter specific cotton hybrid DHB-105 were conducted at Agricultural Research Station, Bagalkot and Gangavati during 1997-1999 and laborator}- experiment was conducted at Agricultural Research Station, Bagalkot from 1998 to 1999 to assess the storability. Irrespective of locations, wider spacing (120 x 120 cm) recorded significantly low plant heigl t (155.9 arid 126.2 cm), higher number of sympodial branches (28.0 and 23.5) per plant, boll weight (4.51 and 4.42 g), boll set (52.5 and 48.0), seed index (10.59 and 10.33 g) seed yield per ha (1694.8 and 1613.9 kg), germination (83.6 and 81.4%), field emergence (75.10 ajid 73.80%) and vigour index (1686 and 1678) at Bagalkot and Gangavati, respectively compared to closer spacing (90 x 90 cm). Soil application of ZnS04 @ 5 kg/ha at sowing recorded significantly higher number of crossed bolls per plant (70.6 and 53.5), boll set (51.5 and 48.7%), boll weight (4.41 and 4.38 g), seed index (10,43 and 10.15 g), seed yield per ha (1639.0 and 1361.4 kg), germination (82.00 and 81.90%), 'field emergence (74.4 and 74.20%) and vigour index (1702 and 1679) at both the locations, respectively and followed by foliar application of boron (0.1%). Application of growth promoters (40 ppm GA3, 20 ppm NAA) and retardant (120 ppm cycocel) significantly increased boll set, boll weight, seed index, seed yield per plant and per ha (kg) besides seed germination, field emergence and vigour index at Bagalkot and Gangavati locations compared to other growth regulators and control. The germination, field emergence and vigour index values decreased steadily with the progress in the storage period. First and second picking seeds recorded better storability compared to third picking. The delinted seed maintained higher seed quality up to 12 months, while linted seeds up to 16 months of storage. The seeds stored in polythene bag (700 gauge) were superior over cloth bag for all tne seed quality parameters throughout the storage period.
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No . of references 154