Abstract
Appropriate nitrogen (N) management practices are of critical importance in improving N use efficiency (NUE), maize (Zea mays) yield and environmental quality. A six-year (2005–2010) on-farm trial was conducted in Ottawa, Canada to assess the effects of N rates and application methods on grain yield and NUE. In four out of the six-year study, grain yield increased by 60–77 kg ha−1 by sidedress, compared to 49–66 kg ha−1 for each kg N ha−1 applied at preplant. Grain yield response to N between the two strategies was similar in the other growing seasons. Sidedress strategy required 15 kg N ha−1 less of the maximum economic rate of N (MERN) than preplant application. Our results indicate that sidedress application of 90–120 kg N ha−1 with a starter of 30 kg N ha−1 resulted in greater yield, grain quality and NUE than preplant N application in this cool, humid and short growing-season region.
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Claims 6
Claim · model-written summary
In four of six years, grain yield increased by 60–77 kg ha−1 per kg N ha−1 with sidedress application, compared with 49–66 kg ha−1 under preplant application.
- Treatment
- sidedresse0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- 60–77 kg ha−1e0
- Qualifier
- 49–66 kg ha−1e0
- Comparator
- preplante0
- Setting
- Ottawa, Canadae2
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In four out of the six-year study, grain yield increased by 60–77 kg ha−1 by sidedress, compared to 49–66 kg ha−1 for each kg N ha−1 applied at preplant”
e1“maize (Zea mays)”
e2“Ottawa, Canada”
Claim · model-written summary
Grain yield response to nitrogen was similar between sidedress and preplant strategies in the other seasons.
- Treatment
- sidedresse2
- Outcome
- Grain yield response to Ne0
- Direction
- similare0
- Qualifier
- other growing seasonse0
- Comparator
- preplante2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield response to N between the two strategies was similar in the other growing seasons”
e1“maize (Zea mays)”
e2“sidedress, compared to 49–66 kg ha−1 for each kg N ha−1 applied at preplant”
Claim · model-written summary
Sidedress required 15 kg N ha−1 less maximum economic nitrogen than preplant application.
- Treatment
- Sidedress strategye0
- Outcome
- maximum economic rate of N (MERN)e0
- Direction
- lesse0
- Value
- 15 kg N ha−1e0
- Comparator
- preplant applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sidedress strategy required 15 kg N ha−1 less of the maximum economic rate of N (MERN) than preplant application”
e1“maize (Zea mays)”
Claim · model-written summary
Sidedress application at 90–120 kg N ha−1 with 30 kg N ha−1 starter gave greater yield than preplant application.
- Treatment
- sidedress application of 90–120 kg N ha−1 with a starter of 30 kg N ha−1e0
- Outcome
- yielde0
- Direction
- greatere0
- Comparator
- preplant N applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sidedress application of 90–120 kg N ha−1 with a starter of 30 kg N ha−1 resulted in greater yield, grain quality and NUE than preplant N application”
e1“maize (Zea mays)”
Claim · model-written summary
That sidedress treatment gave greater grain quality than preplant application.
- Treatment
- sidedress application of 90–120 kg N ha−1 with a starter of 30 kg N ha−1e0
- Outcome
- grain qualitye0
- Direction
- greatere0
- Comparator
- preplant N applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sidedress application of 90–120 kg N ha−1 with a starter of 30 kg N ha−1 resulted in greater yield, grain quality and NUE than preplant N application”
e1“maize (Zea mays)”
Claim · model-written summary
That sidedress treatment gave greater nitrogen use efficiency than preplant application.
- Treatment
- sidedress application of 90–120 kg N ha−1 with a starter of 30 kg N ha−1e0
- Outcome
- NUEe0
- Direction
- greatere0
- Comparator
- preplant N applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sidedress application of 90–120 kg N ha−1 with a starter of 30 kg N ha−1 resulted in greater yield, grain quality and NUE than preplant N application”
e1“maize (Zea mays)”
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