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Application of Probability Distribution and Statistical Models for Productivity of Acacia Mangium

KrishiKosh

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Title Application of Probability Distribution and Statistical Models for Productivity of Acacia Mangium
 
Creator Shilpa V.
 
Contributor S.N. Megeri
 
Subject Agricultural Statistics
 
Description Acacia mangium is very good, short rotation forestry species, good for pulp wood
purpose and adopts well to high rain fall areas. The study was conducted based on secondary
data collected from All India Coordinated Research Project on Agroforestry (AICRP), UAS
Dharwad. The main objectives of the study were to identify suitable statistical models for
estimating the productivity (height/diameter at breast height (dbh)) of Acacia mangium in
respect of different sources, fertilizer level and spacing and to fit the suitable probability
distribution for growth.(Sources:- Kerala, Bangalore, Chikkamangalore, Thirthahalli;
Fertilizer combination :-25:50:25, 50:100:50, 75:150:75 NPK gm/tree; Spacing:-4x1 m,
4x2m, 4x3m).The data pertaining to height and dbh of different sourses,spacing and their
fertilizer combination were collected.
In predicting the height growth of Acacia mangium, among all the sources, Bangalore
(S2) x 50:100:50(F2) is the best sourse and weibul model is the best model with higher
coefficient of determination (R2) value and lower Standard Error(SE) and Root Mean Square
Error (RMSE).(R2 =0.991 , SE=0.194,and RMSE=0.171)] and for spacing combination,
4x3m(SP3) x No fertilizer (F0) is the best spacing and rational function is the best model with
higher R2 value and lower SE and RMSE. [(R2 =0.997, SE=0.085, and RMSE=0.068)] for
Acacia mangium plantation. In case of Diameter at breast height (dbh), among all the sources,
Bangalore (S2) x 50:100:50(F2) is the best sourse and MMF model is the best model with
higher R2 value and lower SE and RMSE[(R2 =0.993, SE=0.249, and RMSE=0.220)] and for
spacing combination, 4x3m (SP3) xNo fertilizer (F0) is the best spacing and MMF model is
the best model with higher R2 value and lower SE and RMSE (R2 =0.998 , SE=0.172,and
RMSE=0.140) is the best spacing for Acacia mangium plantation. For fitting the probability
distribution, the weibul distribution was fitted well for the dbh values than the height values.
 
Date 2016-11-22T13:08:08Z
2016-11-22T13:08:08Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/86939
 
Format application/pdf
 
Publisher UAS, Dharwad