Abstract
A thematic research was planned to find out the effects of thermal changes on crop physiology
and paddy yield of fine rice under subtropical conditions. Various parameters related to crop
physiology and yield were recorded in order to establish the causes underlying the variations in
paddy yield associated with transplanting date and cultivar. Throughout the growth period of
different rice cultivars, early transplanting (1st of July) significantly enhanced LAI over
subsequent late transplanting (15th and 30th of July). LAI of different cultivars was also
significant. Maximum LAI values were found at 75 DAT in all the treatments. LAD was
positively correlated with paddy yield. Percent increase in NAR (g m-2 d-1) in case of 30th July was
14.3, followed by 15th July 10.97 as compared to 1st July. While in case of varieties, NAR (g m-2 d-1)
was not significantly affected by different varieties. Paddy yield also decreased in the subsequent
transplanting dates from 4.71 t ha-1 to 4.22 t ha-1and 4.01 t ha-1 in 1st, 15th and 30th July,
respectively. Paddy yield of different cultivars was also significantly different and it was highest
in case of cv. Basmati-515 as compared to other cultivars. Increase in temperature decreased
paddy yield.
Tasneem Khaliq, Amjed Ali , Muhammad Ahmad, Azhar Mahmood, Muhammad Mubeen. (2013) A STUDY OF THERMAL CHANGES ON PHYSIOLOGY AND PADDY YIELD OF FINE RICE CULTIVARS UNDER SUBTROPICAL CONDITIONS, Asian Journal of Agriculture and Biology, Volume 1, Issue 4.
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