Growth analysis of soybean in differing row widths
Khan, Sajjad
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https://hdl.handle.net/2142/21542
Description
Title
Growth analysis of soybean in differing row widths
Author(s)
Khan, Sajjad
Issue Date
1994
Doctoral Committee Chair(s)
Bullock, Donald G.
Department of Study
Crop Sciences
Discipline
Crop Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Agronomy
Language
eng
Abstract
To study the effect of row width on the growth of soybean (Glycine max (L.) Merrill), an experiment was conducted at the South Farm of the University of Illinois at Urbana-Champaign during 1992 and 1993. The soybean cultivar Elgin (Group II) was planted at 180,000 and 250,000 plants per hectare in 1992 and 1993 respectively, in 38, 76, 114 and 152 cm apart rows, in a RCB design with nine replications. At about weekly intervals, samples from each experimental unit were examined for leaf area (LA), leaf weight (LW), stem weight (SW), pod weight, yellow leaf weight and developmental stage. Plant height, branches per plant, pods per plant, and yield data were recorded at maturity. Protein content and percent oil of the seed were also determined.
Quadratic, cubic, Monomolecular, Logistic, Gompertz, and Richards functions were compared. Although none of these functions were significantly different, the Logistic function was used, to describe the plant dry biomass (BM) data and cubic function was used for the rest of the growth variables. Growth analysis showed that BM, biomass duration, vegetative biomass, vegetative biomass duration, LA or leaf area index (LAI), leaf area duration, LW, SW, and leaf area ratio increased with decreasing row width. Crop growth rate (CGR) was greater up to the mid season but then lesser later in the season for narrow rows. Relative growth rate, net assimilation rate (NAR), and pods per plant decreased with decreasing row width. Leaf weight ratio first increased, but at mid season it decreased and then again increased at the end of the season, for narrow rows. Specific leaf area was lower in the beginning but then increased later with decreasing row width. Seed yield, plant height, branches per plant and harvest index increased with decreasing row width. The increased yield and CGR were accompanied by, and probably a result of, an increased LAI rather than changes in NAR. About 21% oil and 35% protein were found in seed and no differences were found for different row spaces.
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