Abstract
Sensor-based strategies for nitrogen (N) management are promising to achieve high N fertilizer use efficiency and to reduce the amount of wasted N reaching the environment. A need-based N management strategy using an active optical sensor was evaluated for maize grown in a calcareous soil, western of Nile Delta, Egypt. Field experiments were conducted at two locations during 2015 and 2016 to develop and validate an algorithm for refining N fertilizer application. An increasing rate of N fertilizer was applied in the experiment conducted in 2015 year at two different locations to establish plots with different yield potentials. The experiment conducted in 2016 year aimed at validating the established sensor algorithms. It was demonstrated that growth stage V9 (9th leaf collar fully unfolded) is the appropriate stage for applying a corrective N fertilizer dose. Application of a prescriptive dose of 150 kg N ha−1 in two equal split doses, followed by a corrective dose guided by the optical sensor resulted in similar yield as general recommendation, but with lower total fertilizer application. This study revealed that N fertilizer in maize could be managed more efficiently using sensor-guided management than the current general recommendation in calcareous soils of Egypt.
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Claims 4
Claim · model-written summary
Sensor-guided N management (prescriptive 150 kg N ha-1 split dose plus sensor-guided corrective dose) gave yield similar to the general recommendation.
- Treatment
- Application of a prescriptive dose of 150 kg N ha−1 in two equal split doses, followed by a corrective dose guided by the optical sensore1
- Outcome
- yielde1
- Direction
- similare1
- Comparator
- general recommendatione1
- Setting
- western of Nile Delta, Egypte0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize nitrogen fertilization”
e0“maize grown in a calcareous soil, western of Nile Delta, Egypt”
e1“Application of a prescriptive dose of 150 kg N ha−1 in two equal split doses, followed by a corrective dose guided by the optical sensor resulted in similar yield as general recommendation, but with lower total fertilizer application”
Claim · model-written summary
Sensor-guided N management gave lower total fertilizer application than the general recommendation.
- Treatment
- Application of a prescriptive dose of 150 kg N ha−1 in two equal split doses, followed by a corrective dose guided by the optical sensore1
- Outcome
- total fertilizer applicatione1
- Direction
- lowere1
- Comparator
- general recommendatione1
- Setting
- western of Nile Delta, Egypte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize nitrogen fertilization”
e0“maize grown in a calcareous soil, western of Nile Delta, Egypt”
e1“Application of a prescriptive dose of 150 kg N ha−1 in two equal split doses, followed by a corrective dose guided by the optical sensor resulted in similar yield as general recommendation, but with lower total fertilizer application”
Claim · model-written summary
Growth stage V9 (9th leaf collar fully unfolded) is the appropriate stage for applying a corrective N fertilizer dose in maize.
- Organ / stage
- growth stage V9 (9th leaf collar fully unfolded)e2
- Outcome
- appropriate stage for applying a corrective N fertilizer dosee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize nitrogen fertilization”
e2“It was demonstrated that growth stage V9 (9th leaf collar fully unfolded) is the appropriate stage for applying a corrective N fertilizer dose”
Claim · model-written summary
Sensor-guided management allowed N fertilizer in maize to be managed more efficiently than the current general recommendation in calcareous soils of Egypt.
- Treatment
- sensor-guided managemente3
- Outcome
- N fertilizere3
- Direction
- more efficientlye3
- Comparator
- current general recommendatione3
- Setting
- calcareous soils of Egypte3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize nitrogen fertilization”
e3“This study revealed that N fertilizer in maize could be managed more efficiently using sensor-guided management than the current general recommendation in calcareous soils of Egypt”
The same questions in other papers
nitrogen · yield · Zea mays (maize)Positive and negative results
278 papers in the same direction as this paper · 1,906 in the opposite direction
- positive
- positive
- positive
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See all 2,185 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.