Abstract
"Efficient nitrogen (N) fertilizer management is critical for the economic production of maize (Zea mays L.) and the long-term protection of environmental quality. To study the effects of N doses and plant density on the N uptake and efficiency on forage maize cv. SC 704, an experiment was conducted in the Shahrekord region (32° 21' N, 50° 49' E; altitude 2050 m), Iran, at the Agricultural Research Station of Shahrekord University, during the 2007 growing season. The experiment was arranged with four plant densities (92 600, 104 200, 119 000 and 138 900 plants ha-1) and four nitrogen doses (200, 240, 280 and 320 kg ha-1) in a randomized complete block design with four replications. Increases of the plant density led to a significant N uptake in stalk, grain and whole plant. Also, N use efficiency, N uptake efficiency and N harvest index were significantly higher with increasing plant population. However, plant population showed no significant effect on leaf N uptake and N consumption efficiency. Increasing the N doses resulted in a significant higher leaf, stalk, grain and whole plant N uptake. However, N use, uptake and utilization efficiency were significantly decreased. The N harvest index showed different response to the N doses and there was no significant effect. It may be concluded that the optimum plant density for silage maize production can be beyond 138 900 plants ha-1 and utilization of a N dose higher than 240 kg ha-1 should be avoided, in order to minimize N losses."
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Claims 9
Claim · model-written summary
Increased plant density significantly raised N uptake in stalk, grain and whole plant of forage maize.
- Taxon
- forage maizet0
- Treatment
- plant densitye1
- Outcome
- N uptake in stalk, grain and whole plante1
- Direction
- increaseinferrede1
Not reportedComparator
Verbatim
t0“Uptake and nitrogen efficiency in forage maize”
e1“Increases of the plant density led to a significant N uptake in stalk, grain and whole plant”
Claim · model-written summary
Increasing plant population significantly raised N use efficiency, N uptake efficiency and N harvest index.
- Taxon
- forage maizet0
- Treatment
- increasing plant populatione2
- Outcome
- N use efficiency, N uptake efficiency and N harvest indexe2
- Direction
- highere2
Not reportedComparator
Verbatim
t0“Uptake and nitrogen efficiency in forage maize”
e2“N use efficiency, N uptake efficiency and N harvest index were significantly higher with increasing plant population”
Claim · model-written summary
Plant population had no significant effect on leaf N uptake and N consumption efficiency.
- Taxon
- forage maizet0
- Treatment
- plant populatione3
- Outcome
- leaf N uptake and N consumption efficiencye3
- Direction
- no_changeinferrede3
Not reportedComparator
Verbatim
t0“Uptake and nitrogen efficiency in forage maize”
e3“plant population showed no significant effect on leaf N uptake and N consumption efficiency”
Claim · model-written summary
Increasing N doses significantly raised leaf, stalk and grain N uptake of forage maize.
Not reportedComparator
Verbatim
t0“Uptake and nitrogen efficiency in forage maize”
e4“Increasing the N doses resulted in a significant higher leaf, stalk, grain and whole plant N uptake”
Claim · model-written summary
Increasing N doses significantly raised whole plant N uptake of forage maize.
Not reportedComparator
Verbatim
t0“Uptake and nitrogen efficiency in forage maize”
e4“Increasing the N doses resulted in a significant higher leaf, stalk, grain and whole plant N uptake”
Claim · model-written summary
Increasing N doses significantly decreased N use, uptake and utilization efficiency.
- Taxon
- forage maizet0
- Treatment
- Increasing the N dosese4
- Outcome
- N use, uptake and utilization efficiencye5
- Direction
- decreasede5
Not reportedComparator
Verbatim
t0“Uptake and nitrogen efficiency in forage maize”
e4“Increasing the N doses resulted in a significant higher leaf, stalk, grain and whole plant N uptake”
e5“N use, uptake and utilization efficiency were significantly decreased”
Claim · model-written summary
N dose had no significant effect on N harvest index.
Not reportedComparator
Verbatim
t0“Uptake and nitrogen efficiency in forage maize”
e6“The N harvest index showed different response to the N doses and there was no significant effect”
Claim · model-written summary
The authors conclude the optimum plant density for silage maize production can be beyond 138 900 plants ha-1.
Verbatim
t0“Uptake and nitrogen efficiency in forage maize”
e7“It may be concluded that the optimum plant density for silage maize production can be beyond 138 900 plants ha-1 and utilization of a N dose higher than 240 kg ha-1 should be avoided, in order to minimize N losses”
Claim · model-written summary
The authors recommend avoiding a N dose higher than 240 kg ha-1 to minimize N losses.
Verbatim
t0“Uptake and nitrogen efficiency in forage maize”
e7“It may be concluded that the optimum plant density for silage maize production can be beyond 138 900 plants ha-1 and utilization of a N dose higher than 240 kg ha-1 should be avoided, in order to minimize N losses”
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