All these curves follow sigmoid type shapes and so offer some support to proposed Mathematical model.
4. OBSERVATIONS FROM THE GRAPHS
Following is the Observations from the above-discussed Graphs:
In Fig (1) of Percentage of area under High yielding variety of seeds in major food crops, we observed that
adoption curve was exponential between 1970 to 1980. After that growth was not so rapid. It became linear
from 1980 to 1985; afterward it seems to be saturated to cent-percent line as farmers in Punjab adopted nearly
100% high yielding varieties of seeds in major food crops.
In Fig (2) we have observed that curve of consumption of chemical fertilizers in Punjab during 1970 to1985 was
exponential. After that growth of innovation was not so rapid. It became approximately linear between 1985 to
1990 and after 1990 it seems to become saturated to the line of above 1200 metric nutrient tones.
In Fig (3) we have observed that the curve of consumption of chemical fertilizers in Punjab is exponential from
1980 to 1990, it became linear from 1990 to 1995. After that growth become saturated to the line of 7000 metric
tones. Approximately saturation level attained.
In Fig (4) for the registration of tractors in Punjab, curve was exponential from 1970 to 1990. Afterward,
growth rate of innovation didn't look rapid. It became linear after 1990.and towards saturation; this curve is
much closer to sigmoid curve.