Prediction models in teak based agroforestry systems in northern transitional zone of Karnataka
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Date
2009
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UAS, Dharwad
Abstract
The study was conducted based on secondary data collected from AICRP on
agroforestry, UAS Dharwad. The main objectives of the study were to predict the yield of
teak and agriculture crop and to fit growth curves for measuring identified parameters in teak
based agroforestry systems. To study the influence of perennial crop in relation to associated
field crop in teak based agroforestry system and for studying the economics of teak based
agroforestry systems. The data pertaining to yield of teak and associated agriculture crop at
different spacing combinations Viz., 10m and 20m spacing between two rows of teak were
collected.
In predicting diameter growth MMF model was found to be the best followed by
Gompertz and Weibull models for both 10m and 20m spacing combinations. In predicting the
height growth in 10m spacing, MMF model is again found to be the best followed by Weibull
and Richards model. For 20m spacing combination, the models were MMF, Logistic and
Weibull.
MMF model was used to predict the diameter and height of the teak crop for the
future years because the model’s R2 was found to be high and less standard error. To study
the influence of the tree crop on the associated field crop the yield of field crops at different
distance from the tree components was taken and changes were studied. It was found that in
the initial years when the height of the tree component was less the yield levels of field crop
were high and as the height increases, decreasing trend is noticed in the field crop. It was also
found that net income from agroforestry systems was very high compared to that of sole
farming. Field crop+teak combination ranks first followed by field crop+teak+grass and field
crop+teak+subabul which are on par with AICRP results.
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Keywords
Agricultural Statistics