Polynomial functional models to simulate crop growth in maize (Zea mays L.) cultivars
Polynomial and polynomial exponential models of order one to four were tried to describe crop growth in two maize cultivars viz., Deccan hybrid and Deccan 101 of an agronomic trial conducted at the University of Agricultural Sciences, Bangalore, on alfisols. Relative growth rate (RGR) of classical a...
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Published in | Journal of agronomy and crop science (1986) Vol. 171; no. 1; pp. 55 - 64 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Oxford, UK
Blackwell Publishing Ltd
01.08.1993
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Subjects | |
Online Access | Get full text |
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Summary: | Polynomial and polynomial exponential models of order one to four were tried to describe crop growth in two maize cultivars viz., Deccan hybrid and Deccan 101 of an agronomic trial conducted at the University of Agricultural Sciences, Bangalore, on alfisols. Relative growth rate (RGR) of classical and functional methods was compared. Models performance was assessed based on r2, χ2 residuals sum of squares (RSS), root mean standard deviation (RMSD) and presence or absence of heteroscedasticity in models' predictions. In the cultivars, polynomials of order three and four in Deccan hybrid and cubic polynomial in Deccan 101 simulated dry matter production (DMP) by 99.5 % and showed good distribution of error variance over the observed DMP. The RGR from the third and fourth degree polynomials in both the cultivars was comparable to the classical method and explained better during post‐silking period. Polynomial exponentials predicted very low RGR. Between cultivars, Deccan 101 showed higher RGR during 45–80 days after sowing and contributed significantly more to final DMP. |
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Bibliography: | U10 9420081 F01 ark:/67375/WNG-TZRPKFKW-V ArticleID:JAC55 istex:5698BAC2572A80221C9153F1E437A59BA5683B48 With 4 figures and 2 tables |
ISSN: | 0931-2250 1439-037X |
DOI: | 10.1111/j.1439-037X.1993.tb00436.x |