Agriculture is one of the major sources of income and gainful employment for the people of Uttarakhand state in India. Wheat based agriculture system contributes immensely to maintain livelihood for a large section of people inhabited in hills of this state because of short growing season in summer. Hill is considered as backward (i.e., not progressive) region since introduction of improved varieties of seeds and transfer of advance agriculture technology cast little or no impact on promotion and development of agriculture in this sector. Diversity in productive capacity of crop experience on same site at different elevation of hill because constraints imposed by ecology did not permit such movement to any unlimited extent. Low temperature becomes an important limitation for production of
grains in wheat cultivars as altitude increases. An alteration of growth habit accompanied with changes in morphology of leaf, shoot and root characteristic and cool temperature induced sterility in florets seemed to be associated with yield loss. In this investigation, as an initial approach possible limits of some physiology related deterrent yield contributing traits are identified through study the extent of variability of these characters, their relationship and relative contribution to grain yield among 9 wheat cultivars (viz., HPW 155, HPW 236, HPW 277, HS 473, SKW 323, Sonalika, VL 829, VL 832 and Local cultivar) grown under field condition at an elevation of 2100 m above mean sea
level (msl) at Ranichauri (78°24/N and 30°18/E). The results revealed an increase in average growing degree days for head emergence and number of days experiencing lower soil temperature than air temperature during anthesis together induced sterility in florets. An increase in thermal time at post anthesis grain filling period encouraged the production of grains. Grain yield did not show significant
correlation with leaf, shoot and root characters. Susceptible cultivars, however, exhibited a greater percentage of sterile florets in population, low grain yield, high root to shoot ratio, less thickness of fresh leaves and less dry matter deposition. The varieties VL 829, HPW 236 and HS 473 showed superior in yield and higher tolerance to cool conditions at high altitude.
B. B. Bandyopadhyay
G. B. Pant University of Agriculture and Technology, Pantnagar-263 145, US Nagar, Uttarakhand, India.
View Book :- https://bp.bookpi.org/index.php/bpi/catalog/book/252