physicochemical

ABSTRACTS
Abstracts of Theses Accepted for the Award of Post-Graduate and
Doctorate Degrees in the Acharya N.G. Ranga Agricultural University, Rajendranagar,
Hyderabad - 500 030
Phenology of Chickpea (Cicer arientinum L.) in terms of thermal times under
coastal conditions of Andhra Pradesh
Student: Mrudula Gummadi
Major Advisor: Dr. Y. Ashoka Rani
Department of Plant Physiology
The present investigation entitled “Phenology
of Chickpea (Cicer arientinum L.) in terms of thermal
times under coastal conditions of Andhra Pradesh” was
undertaken at the Agricultural College Farm, Bapatla
during rabi 2007-08. It was found that plant height,
number of branches of effective branches, leaf area and
leaf area index were significantly influenced by dates of
sowing and varieties.
The correlation analysis between yield and
phenophase wise heat units revealed that yield of KAK-
2 was positively and significantly correlated with GDD
and PTU accumulated during podding stage. In JG-11,
yield was positively and significantly correlated with the
HYTU during flowering and negatively and significantly
correlated with GDD, PTU and PYTU accumulated during
vegetative stage and also with HYTU accumulated during
podding stage. In Annegiri, positive significant
correlation with HYTU during flowering and negative
significant correlation with HYTU during vegetative
stages was observed. The correlation between TDM and
phenophasic heat indices indicated that in KAK-2, TDM
production correlated negative and significantly with HTU
during flowering.
The HUE, PTUE and HTUE were found higher
under second DOS than the subsequent sowings and it
was higher for JG-11 than KAK-2 and Annegiri.
For each unit of GDD, PTU, HTU and HYTU
accumulated the yield of chickpea in terms of both
biological and economical was found higher under 18 th
November sowing. From this it can be concluded that
the requirement of GDD, PTU, HTU and HYTU for
chickpea crop in 2247 0 C d, 2871 0 C d -1 h -1 , 11596 0 C
d -1 h -1 and 176244 respectively. The maximum yield of
three varieties was obtained under 18 th November
sowing. This indicates that the requirement of GDD, PTU,
HTU and HYTU KAK-2 is 2332 0 C d, 26441 0 C d -1 h -1
12183 0 C d -1 h -1 and 178857 respectively; for JG-11
2162 0 C d 25590 0 C d -1 h -1 ,11175 0 C d -1 h -1 and 176916
respectively. Hence, it can be concluded that under
coastal conditions of Andhra Pradesh, sowing of
chickpea during 3 rd week of November would give better
productivity. JG-11 is more suitable as it is the high
yielder. M.Sc (Ag), 2008
Factors influencing the disease development of purple blotch of onion and effect
of certain plant extracts, fungicides and biocontrol agents on the causal organism
of the diseases.
Student: Abdul Kareem. M Major Advisor: Dr. K. V. M. Krishna Murthy
Department of Plant Pathology
Alternaria Porri (Ellis) Cif. Causing purple blotch
diseases on onion was isolated and identified, and the
effect of host age, inoculum concentration temperature,
relative humidity and light on diseases development,
effect of certain plant extracts, bio-control agents and
fungicides on spore germination and growth of the casual
organism were studied.
Onion plants were found to be susceptible to
Alternia porri at different ages. Maximum percent
diseased index diseases index (PDI) was recorded in
60 days old plans when inoculated artificially. There
was an increase in the per cent diseases index (PDI)
with increase in the plant age. Maximum per cent
diseases index (PDI) of 57.03 was recorded on plant
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