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Paper Information

Journal:   PLANT ECOPHYSIOLOGY (ARSANJAN BRANCH)   summer 2018 , Volume 10 , Number 33 #p00547; Page(s) 186 To 199.
 
Paper: 

Modeling growth and yield of winter wheat in Hamadan province

 
 
Author(s):  GHASEMI MAHAM S., TORABI B., Dadrasi A.
 
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Abstract: 
In order to modeling of growth stages and yield of wheat according to Hamedan province meteorological data (minimum and maximum temperature, radiation and rainfall) By using the sub models of phenology, production and distribution of dry matter and leaf area changes in maize studies was conducted at the Faculty of Agriculture, University of Vali-e-Asr Rafsanjan in spring 2015. The parameters of sub model were estimated according to data from previous researches in Iran and other countries. Daily changes of phenology, harvest Index total dry matter and leaf area was calculated using the model and the yield at the end of season was predicted. One of the criteria to evaluation of a model is Comparison between coefficients of linear regression of observed and predicted yield (b=0. 90± 0. 67 and a=0. 73± 0. 10) and coefficients of line 1: 1 (1, 0). Accuracy of the model related to coefficient of variations of predicted and observed seed yield (CV= 7. 28) was very high so that in field experiments coefficient of variations limit is 20 to 25. R2 quantity of seed yield was 0. 81; showing that the probability for coordination of predicted and observed data is 81 percent. The Root mean square error is the other statistics which is used to evaluation of model accuracy. The Root mean square error of seed yield was 0. 43, which is evidence of accuracy of model for yield prediction. domain variation for observed and predicted data were 4. 08-8. 01 tones and 4. 08-7. 59 tons per hectare respectively and the means were 6. 09 and 5. 53 tones per hectare respectively.
 
Keyword(s): Meteorological data,wheat,management,grain yield,Hamedan
 
References: 
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