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

Related Articles

 Factors Affecting Chemical Properties of Camel Milk

 This study was carried out with main objective is to assess factors affecting chemical properties of camel milk. Milk samples were collected from lactated camels of Camel Research Centre farm belonging to the Unive...

 In vitro growth inhibition of Aspergillus flavus, a major aflatoxin producing fungus, using Thymus eriocalyx essential oil

 In this study the effect of Thymus eriocalyx essential oil on the growth of Aspergillus flavus, a major producer of aflatoxin, was evaluated in vitro. The assessment was done by conducting an experimental completel...

 Physiological and oxidative stress responses of potato mother-tuber applied hydrogen peroxide

 Different concentrations of hydrogen peroxide (20, 40, 60 and 80 mM) were applied in potato mother tubers before planting in field. Afer harvesting, the results indicated that seed soaking mother tubers with hydrog...

 The Effect Of Bacillus Thuringiensis On The Quantity Of Potato Leaves Epiphytic Microflora And It´S Fungistatic Action

 The β-exotoxin containing enthomopathogenic strain B. thuringiensis 994, in first two days after processing the potato plants with the bioinsecticide, promotes the decreasing a number of ammonificators, fungus and...

 Germination characteristics of twenty varieties of soybean (glycine max (l) merr stored for seven months

 Twenty soybean cultivars were grown at the University of Agriculture Makurdi Teaching and Research Farm in July 2006 and harvested October 5th and November 7th2006 according to the time physiological maturity of th...

Download PDF file
  • EP ID EP116450
  • DOI 10.15192/PSCP.SA.2014.4.3.126132
  • Views 130
  • Downloads 0

How To Cite

Alexander Matev, Hristofor Kirchev, Radost Petrova, Rada Popova (2014).  Comparative Evaluation of Formulas for Establishment of "Yield – Irrigation Depth" Relationship Parameters for Soybean. Scientia Agriculturae, 8(3), 126-132. https://europub.co.uk/articles/-A-116450