Abstract
With the demand for maize increasing, production has spread into more water limited, semiarid regions. Couple this with the increasing nitrogen (N) fertilizer costs and environmental concerns and the need for proper management practices has increased. A trial was established to evaluate the effects of different preplant N fertilizer sources on maize cultivated under deficit irrigation or rain-fed conditions on grain yield, N use efficiency (NUE), and water use efficiency (WUE). Two fertilizer sources, ammonium sulfate (AS) and urea ammonium nitrate (UAN), applied at two rates, 90 and 180 kg N ha −1 , were evaluated across four site-years. Deficit irrigation improved grain yield, WUE, and NUE compared to rain-fed conditions. The preplant application of a pure ammoniacal source of N fertilizer, such as AS, had a tendency to increase grain yields and NUE for rain-fed treatments. Under irrigated conditions, the use of UAN as a preplant N fertilizer source performed just as well or better at improving grain yield compared to AS, as long as the potential N loss mechanisms were minimized. Producers applying N preplant as a single application should adjust rates based on a reasonable yield goal and production practice.
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Claims 7
Claim · model-written summary
Deficit irrigation improved maize grain yield over rain-fed conditions.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deficit irrigation improved grain yield, WUE, and NUE compared to rain-fed conditions.”
t0“Maize”
Claim · model-written summary
Deficit irrigation improved maize WUE over rain-fed conditions.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deficit irrigation improved grain yield, WUE, and NUE compared to rain-fed conditions.”
t0“Maize”
Claim · model-written summary
Deficit irrigation improved maize NUE over rain-fed conditions.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deficit irrigation improved grain yield, WUE, and NUE compared to rain-fed conditions.”
t0“Maize”
Claim · model-written summary
Preplant ammonium sulfate tended to increase grain yield under rain-fed conditions.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The preplant application of a pure ammoniacal source of N fertilizer, such as AS, had a tendency to increase grain yields and NUE for rain-fed treatments.”
t0“Maize”
Claim · model-written summary
Preplant ammonium sulfate tended to increase NUE under rain-fed conditions.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The preplant application of a pure ammoniacal source of N fertilizer, such as AS, had a tendency to increase grain yields and NUE for rain-fed treatments.”
t0“Maize”
Claim · model-written summary
UAN performed at least as well as AS for irrigated maize grain yield when N losses were minimized.
- Treatment
- UANe0
- Outcome
- grain yielde0
- Direction
- just as well or bettere0
- Qualifier
- as long as the potential N loss mechanisms were minimizede0
- Comparator
- ASe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under irrigated conditions, the use of UAN as a preplant N fertilizer source performed just as well or better at improving grain yield compared to AS, as long as the potential N loss mechanisms were minimized.”
t0“Maize”
Claim · model-written summary
Preplant N rates should reflect yield goal and production practice.
- Treatment
- N preplant as a single applicatione0
- Outcome
- adjust rates based on a reasonable yield goal and production practicee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Producers applying N preplant as a single application should adjust rates based on a reasonable yield goal and production practice.”
t0“Maize”
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