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Author: Manjunath B. Kulkarni × End date: 2012 × Start date: 2012 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Effect of Temperature Regimes on Productivity in Chickpea (Cicer arietinum L.)
    (UAS, Dharwad, 2012) Manjunath B. Kulkarni; V.P. Chimmad
    A field experiment was conducted during rabi, 2011-2012 at Main Agricultural Research Station, University of Agricultural Sciences, Dharwad to assess productivity in chickpea. The experiment consisted of chickpea genotype, Annigeri-1 and eight temperature regimes (dates of sowing) laid out in a randomised block design (RBD) with three replications. The crop was sown at weekly intervals (standard weeks) starting from 39th week to 46th week. Among the sowing dates, 43rd, 44th and 42nd week recorded significantly higher seed yield when compared to 45th and 46th standard weeks. Significantly higher plant height and number of branches were recorded in eighth dates of sowing. The number of days for flower initiation, 50% per cent flowering and pod initiation increased up to 42nd weeks of sowing and then decreased. It is evident that the higher dry matter and its distribution along with higher leaf area LAI, SLW, LAD, AGR, CGR, RGR and NAR values was observed in 42nd standard week (29th October ), 43rd standard week (29th October ) and 44th standard week (5th November), when compared to other dates of sowing. This is attributed to lower GDD values (1388-1433 degree days) and lower accumulated Tmin values (14.2 -15.10C) and an optimum of Tmax values around 290C. Further, November dates of sowing recorded significantly higher yield (28.54 q ha-1) and harvest index (48.67%). The sowing dates 39th standard week (1st Oct), 40th standard week (8th Oct) recorded significantly higher chlorophyll a, chlorophyll b and total chlorophyll. However, the ratio of chlorophyll a/b was significantly higher under 3rd week of October to 1st week of November month sowing dates. It is also confirmed that the Tmax and Tmin temperatures played a major role in enhancing the yield in chickpea which is independent of sowing dates.