Studies on Seed Technological Approaches in Hybrid Pigeonpea (Cajanus cajan (L.) Millsp.)
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Date
2012
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UAS Dharwad
Abstract
Field experiment was conducted at MARS, Dharwad on effect of growth
regulators on seed yield and quality of pigeonpea hybrid during 2010-11 and 2011-12.
Second experiment was conducted at Dharwad, Bijapur and Bagalkot on stability
performance of ten genotypes and third experiment with three sowing dates at two
locations was conducted for flowering behaviour of four genotypes. Varietal
characterization was studied in Department of Seed Science and Technology, UASDharwad.
Foliar spraying of planofix @ 0.5 ml/l recorded maximum number of
flowers retained (305.33), pod number (303.3), pod yield (78.58 g & 3143 kg) and
seed yield (57.75 g & 2310 kg) per plant and hectare with least flower drop (76.88 %)
and higher 100 seed weight (11.71 g), germination (88.79 %), seedling length (25.88
cm) and vigour index (2299) followed by miraculan @ 1 per cent. Similar significant
effects were recorded for growth regulators sprayed at flower initiation stage and
interaction effect. Among the ten genotypes, ICPR-3762 was found highly stable for
growth parameters while, ICPH-2740 and ICPR-3762 found stable for yield
parameters at three locations based on regression coefficient (bi), regression deviation
(S2di) and mean values. At Dharwad and Bagalkot locations, June 15th sowing
recorded significantly higher pod number per plant (349.18 and 317.93), seed yield
(70.33 and 56 g) per plant and (2813 and 2240 kg) per hectare. Among the four
genotypes, ICPA-2043 recorded higher seed yield per plant and hectare at both
locations. Morphological characterization of eleven genotypes based on seed, seedling
and phenological characters was done. It was found more reliable for varietal
identification. Eleven genotypes were grouped into three clusters and greater
similarity within clusters was noticed. Genotypes ICPH-2671, ICPH-2740, ICPR-
2671 and ICPR-2740 were in Cluster-I; ICPA-2043, ICPA-2047 and ICPA-2092 in
Cluster-II; ICPH-3762, ICPH-3461, ICPR-3762 and ICPR-3461 in Cluster -III
sharing maximum genetic similarity.