Abstract
Corn ( Zea mays L.) grown in an equidistant plant‐spacing pattern (EPS) often yields more grain per unit area of land than that grown in conventional plant‐spacing patterns (CPS). The objective of this study was to determine the effect of equidistant plant spacing on aboveground dry matter production in corn. Two hybrids (‘Pioneer brand 3732’ and ‘B73 ✕ LH58’) were grown in two planting patterns (EPS and CPS) in field studies on a Chalmers silty clay loam soil (Typic Haplaquoll) near West Lafayette, IN, in 1983 and 1984. Measurements of plant dry matter accumulation and leaf area development began at growth stage V4 and continued weekly through R6. Growth analysis components were estimated from growth curves fitted to the relationships between the measured plant variables (dry weight per plant and dry weight per leaf) and a temperature index measured in growing degree days (GDD). Crop growth rate was greater for EPS than for CPS early in the growing season for both hybrids. An increase in plant biomass was primarily responsible. Although relative growth rate (RGR) tended to be smaller for EPS compared to CPS, the data suggested that the increase in plant biomass caused by EPS may be related to an increased RGR prior to 400 to 500 GDD after planting. Net assimilation rate was not significantly increased by EPS early in the season. Early and mid‐season leaf area indexes, however, were greater for EPS for both hybrids.
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Claims 6
Claim · model-written summary
Crop growth rate was greater under equidistant spacing early in the season for both corn hybrids.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- EPSe0
- Outcome
- Crop growth ratee0
- Direction
- greatere0
- Qualifier
- early in the growing season for both hybridse0
- Comparator
- CPSe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop growth rate was greater for EPS than for CPS early in the growing season for both hybrids”
t0“Corn”
Claim · model-written summary
Increased plant biomass primarily explained the early crop growth rate increase under equidistant spacing.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- Crop growth ratee1
- Qualifier
- increase in plant biomasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in plant biomass was primarily responsible”
e1“Crop growth rate was greater for EPS than for CPS early in the growing season for both hybrids”
t0“Corn”
Claim · model-written summary
Relative growth rate tended to be smaller under equidistant spacing than conventional spacing.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- EPSe0
- Outcome
- relative growth rate (RGR)e0
- Direction
- smallere0
- Comparator
- CPSe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“relative growth rate (RGR) tended to be smaller for EPS compared to CPS”
t0“Corn”
Claim · model-written summary
The authors suggest that biomass increase under equidistant spacing may relate to increased relative growth rate before 400 to 500 growing degree days.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- EPSe0
- Outcome
- RGRe0
- Direction
- increasede0
- Qualifier
- prior to 400 to 500 GDD after plantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase in plant biomass caused by EPS may be related to an increased RGR prior to 400 to 500 GDD after planting”
t0“Corn”
Claim · model-written summary
Net assimilation rate was not significantly increased by equidistant spacing early in the season.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- EPSe0
- Outcome
- Net assimilation ratee0
- Direction
- not significantly increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net assimilation rate was not significantly increased by EPS early in the season”
t0“Corn”
Claim · model-written summary
Early and mid-season leaf area indexes were greater under equidistant spacing for both hybrids.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- EPSe0
- Outcome
- leaf area indexese0
- Direction
- greatere0
- Qualifier
- for both hybridse0
- Comparator
- CPSe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early and mid‐season leaf area indexes, however, were greater for EPS for both hybrids”
t0“Corn”
e1“Crop growth rate was greater for EPS than for CPS early in the growing season for both hybrids”
The same questions in other papers
density · growth · Zea mays (maize)Positive and negative results
118 papers in the same direction as this paper · 76 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- positive
- positive
193 papers more in this group
See all 197 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.