Comparative Evaluation of Formulas for Establishment of "Yield – Irrigation Depth" Relationship Parameters for Soybean
Journal Title: Scientia Agriculturae - Year 2014, Vol 8, Issue 3
Abstract
The aim of this work is to establish parameters of relationship “Yield-irrigation depth” for soybean (grown in region of Plovdiv), using some different equations as follows: /1/ y=ax2+bx+c; /2/ y=y0+2(1–y0)x–(1–y0)x2; /3/ Y=1–(1–Y0)(1–x)n. The source data used for the study are from field experiment, carried out in region of Plovdiv (Bulgaria) on alluvial-meadow soil, with soybean variety “Mira”. Variants of the field experiment are: 1 – without irrigation; 2, 3, 4 and 5 – irrigation with 25, 50, 75 and 100% of irrigation rate, determined by optimal variant (pre irrigation soil moisture 75% of FC for the layer 0 – 80 cm). The results show, that equation /3/ is most suitable, from a mathematical point of view and at the same time corresponding well with the biology of the crop. Variations of calculated yields using this equation to experimental yields are from – 9.9 to + 8.2% and in more than 50% of cases they are less than ± 2%. The following parameters are established: n=1.3 (from 1.1 to 1.7) and R=0.987 (from 0.935 to 0.992). The comparison between the formulas /1/ and /2/ shows, that the first one is mathematically more accurate and the second one – more accurately to the biology of culture in relation to growing it in a different water deficit.
Authors and Affiliations
Alexander Matev, Hristofor Kirchev, Radost Petrova, Rada Popova
Keywords
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- EP ID EP116450
- DOI 10.15192/PSCP.SA.2014.4.3.126132
- Views 128
- Downloads 0
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