Effect of Temperature Regimes on Productivity in Chickpea (Cicer arietinum L.)
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Date
2012
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Publisher
UAS, Dharwad
Abstract
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.