Evaluation of statistical models for agroforestry systems
KrishiKosh
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Title |
Evaluation of statistical models for agroforestry systems
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Creator |
R.Veena
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Contributor |
S.N.Megeri
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Subject |
Agricultural Statistics
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Description |
The study was conducted based on secondary data. The main objective of the study was to predict the yield of different tree species and agriculture crop. Here we have considered seven tree species namely Azadirachta indica, Dalbergia latifolia, Prosopis cineraria, Ceiba pentandra, Terminalia bellarica, Mangifera indicia, Tamarindus indica and soybean as field crop in tree interspace. The required data was collected from AICRP (All India Co-ordinated Research Project) on agroforestry, UAS Dharwad. The different models were tried and the best two models were selected based on R2 and Standard error value. The result indicated that Polynomial model, Sinusoidal model, MMF model, and Sinusoidal model were found better for the height of tree species in general. The best fitted model for Diameter of the above mentioned tree species were Gaussian model followed by Richards model, Gaussian model followed by and Richards model, MMF model followed by Gompertz model, Gompertz model followed by Weibull model, MMF model followed by Gompertz model, Rational model followed by Gompertz model and MMF model followed by Gompertz model respectively. The yield of field crop (soybean, at 1m and 5m distance) was increased in the beginning i.e. up to five years and then declining trend was notice. The best fitted model for soybean yield was Rational and Hoerl model for both 1m and 5m distance. The negative correlation between the yield and diameter, yield and height and positive correlation between height and diameter was noticed. Multiple regression also traied to find out the yield of field crop in relation to height, dbh and weather parameters. The step down procedure indicates the rain fall and temperature contributes more for the field crop. |
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Date |
2016-11-09T17:05:08Z
2016-11-09T17:05:08Z 2010 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/84740
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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