ESTIMATION OF RICE PRODUCTIVITY IN RELATION TO SPATIAL-THERMAL VARIATIONS–A STATISTICAL ANALYSIS
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Date
10-08-12
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University of Agricultural Sciences GKVK, Bangalore
Abstract
Climate change and agriculture production are interrelated
process. Change in weather parameter at different stage of crop growth
influence crop output. The present study attempt to analyse the impact
of spatial –thermal variations on productivity of rice crop. The data of rice
yield and weather variables were consider for the period of 1992 to 2011
for Mandya and Kathalagere locations.
Trend analysis revealed that maximum and minimum temperature
at the two locations selected for the study registered a positive trend. The
trend analysis indicated minimum temperature registered negative trend
during tillering stage at Mandya and germination stage at Kathalagere.
The correlation between maximum temperature and productivity
showed positive relationship during germination stage and negative
relationship during flowering stage. Relative humidity and productivity
were positively related during maturity stage.
Multiple linear regression models indicated maximum temperature
during germination and maturity stage for both the locations had
significant impact on productivity. While maximum temperature during
flowering stage had negative significant coefficient for both the locations.
It reveals that increasing maximum temperature during flowering stage
results in reduction of yield. Quadratic function fitted to estimate the
optimal thermal regimes that facilitate to realize the potential yield of rice
crop in both the locations. At Mandya the maximum temperature in the
range from 290c to 31.50c and minimum temperature in the range from
18.50c to 20.50c and for Kathalagere the maximum temperature range
from 290c to 310c and minimum temperature range from 190c to 200c to
be ideal to trap optimum potential yield.