Abstract
Increase of planting density has been widely used to increase grain yield in maize. However, it may lead to higher risk of root lodging hence causing significant yield loss of the crop. The objective of this study was to investigate the effect of planting density on maize nodal root growth characteristics and to analyse their relationships to root lodging resistance. Field experiment was conducted in 2010 and 2011, using two maize varieties, Zhengdan 958 (ZD) and Xianyu 335 (XY), under three planting densities, viz., 4.50, 8.25 and 12.00 plants m-2. The results showed the root failure moment, an indicator of root lodging resistance, was significantly affected by the planting density, the maize variety, as well as the crop developmental stages, and was decreased with increasing planting density. The number and the average diameter of the roots on the upper internodes (phytomer 5 to 8) were decreased with increasing planting density, whereas the maize variety had little effects on those variables. On the contrary, the root angle was less responsive to planting density but was significantly affected by the variety being that XY had larger root angle than did ZD. The root failure moment was linearly positively correlated with the total root number and the average root diameter on the upper internodes, indicating that a greater root number and a larger root diameter are important traits for enhancing root lodging resistance in maize plants.
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Claims 8
Claim · model-written summary
Root failure moment decreased as planting density increased.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the root failure moment, an indicator of root lodging resistance, was significantly affected by the planting density, the maize variety, as well as the crop developmental stages, and was decreased with increasing planting density”
Claim · model-written summary
Upper-internode root number decreased with planting density.
- Organ / stage
- roots on the upper internodese0
- Treatment
- planting densitye0
- Outcome
- numbere0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number and the average diameter of the roots on the upper internodes (phytomer 5 to 8) were decreased with increasing planting density”
t0“Maize”
Claim · model-written summary
Upper-internode root diameter decreased with planting density.
- Organ / stage
- roots on the upper internodese0
- Treatment
- planting densitye0
- Outcome
- average diametere0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number and the average diameter of the roots on the upper internodes (phytomer 5 to 8) were decreased with increasing planting density”
t0“Maize”
Claim · model-written summary
Maize variety had little effect on root number and diameter.
Not reportedTaxonDirection
Verbatim
e0“the maize variety had little effects on those variables”
Claim · model-written summary
Root angle responded little to density.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the root angle was less responsive to planting density”
t0“Maize”
Claim · model-written summary
XY had a larger root angle than ZD.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“XY had larger root angle than did ZD”
t0“Maize”
Claim · model-written summary
Root failure moment correlated positively with total root number.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The root failure moment was linearly positively correlated with the total root number and the average root diameter on the upper internodes”
t0“Maize”
Claim · model-written summary
Root failure moment correlated positively with upper-internode root diameter.
- Organ / stage
- average root diameter on the upper internodese0
- Outcome
- root failure momente0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The root failure moment was linearly positively correlated with the total root number and the average root diameter on the upper internodes”
t0“Maize”
The same questions in other papers
density · growth · Zea mays (maize)Positive and negative results
77 papers in the same direction as this paper · 119 in the opposite direction
- positive
- negative
- no effect
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.