Volume 3, Issue 2 (2001)
JAST 2001, 3(2): 131-139 |
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Majnoun Hosseini N, Ellis R H, Yazdi-Samadi B. Effects of Plant Population Density on Yield and Yield
Components of Eight Isolines of cv. Clark
(Glycine max L.). JAST 2001; 3 (2) :131-139
URL: http://jast.modares.ac.ir/article-23-2092-en.html
URL: http://jast.modares.ac.ir/article-23-2092-en.html
1- Department of Agronomy, College of Agriculture, The University of Tehran, Islamic Republic of Iran.
2- Department of Agriculture, The University of Reading, Earley Gate, P.O.Box: 236, Reading, RG6 6AT, UK.
2- Department of Agriculture, The University of Reading, Earley Gate, P.O.Box: 236, Reading, RG6 6AT, UK.
Abstract: (5650 Views)
A field study was conducted to evaluate the agronomic response of eight isolines of cv.
Clark on a clay loam soil (at Karaj-Iran, 35048´) to four plant population densities of 11.3,
18.5, 68.5, and 103.4 plants per square metre. Significant yield increase was obtained as a
result of higher plant density. Differences among the cv. Clark isolines were significant
(p<0.05). Yield components such as numbers of branches, pods, and seeds per plant decreased
linearly as population density increased. Adjustments in pods and seeds per plant
resulted from altered branches per plant. The isolines which exhibit profuse branching
(e.g. E1E2E3, E1e2E3, E1E2 e3) were capable of optimising yield when planted at low densities.
The second dynamic factor that aided yield compensation by plant population density
was greater total dry matter partitioning, which resulted in a significantly greater harvest
index at the lower compared with the higher plant density. The results indicated that total
biomass and crop growth rate were the major elements explaining the reduced yield compensation
factors at higher plant population density. Plotting the fitted seed yield values
against the number of dominant alleles showed the effect of the maturity genes on the response
of seed yield to plant density.
Subject:
Plant Breeding
Received: 2010/05/16 | Accepted: 2010/05/16 | Published: 2010/05/16
Received: 2010/05/16 | Accepted: 2010/05/16 | Published: 2010/05/16
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