Abstract
Over the last few years maize growers have expressed an interest in more cost-effective and sustainable crop management practices, especially nitrogen fertiliser use, and here we investigate the effect of different N management strategies on maize silage and grain yields and N concentration. The four-fold replicated split plot experiment compared two irrigation regimes (minimal and heavy) and five N fertiliser treatments, a control and four methods of applying 350 kg Nlha. Yield and N concentration of maize silage, grain and crop residues were measured. A winter cover crop of oats was sown to determine any carry over effect of the treatments. The irrigation treatment did not effect maize silage or grain yields. The control silage yields were significantly less than all fertilised treatments but maize silage and grain yields were similar for plots that received N fertiliser, thus fertiliser application method did not affect yields. Irrigation treatment did not affect crop nitrogen concentration but fertiliser had a large effect on N concentration of the silage, grain and crop residue. Plant N concentration at both silage and grain harvest was least in the control plots and highest where all fertiliser was applied at planting, but this probably luxury N uptake by these treatments as no yield advantage accrued. The yield of the subsequent winter cover crop was significantly higher in the fertilised plot compared with the control.
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Claims 10
Claim · model-written summary
Irrigation regime did not affect maize silage or grain yield.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation treatment did not effect maize silage or grain yields.”
t0“maize”
Claim · model-written summary
Unfertilized control maize silage yield was significantly below all fertilized treatments.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The control silage yields were significantly less than all fertilised treatments”
t0“maize”
Claim · model-written summary
Maize silage yield was similar across nitrogen application methods.
- Treatment
- fertiliser application methode0
- Outcome
- maize silagee0
- Direction
- similare0
- Comparator
- plots that received N fertilisere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize silage and grain yields were similar for plots that received N fertiliser, thus fertiliser application method did not affect yields.”
t0“maize”
Claim · model-written summary
Maize grain yield was similar across nitrogen application methods.
- Treatment
- fertiliser application methode0
- Outcome
- grain yieldse0
- Direction
- similare0
- Comparator
- plots that received N fertilisere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize silage and grain yields were similar for plots that received N fertiliser, thus fertiliser application method did not affect yields.”
t0“maize”
Claim · model-written summary
Irrigation regime did not affect maize crop nitrogen concentration.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation treatment did not affect crop nitrogen concentration”
t0“maize”
Claim · model-written summary
Fertilizer had a large effect on nitrogen concentration of maize silage, grain and residues.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertiliser had a large effect on N concentration of the silage, grain and crop residue.”
t0“maize”
Claim · model-written summary
Maize plant nitrogen concentration at both harvests was lowest in control plots.
- Organ / stage
- both silage and grain harveste0
- Treatment
- control plotse0
- Outcome
- Plant N concentratione0
- Direction
- leaste0
- Comparator
- all fertiliser was applied at plantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant N concentration at both silage and grain harvest was least in the control plots and highest where all fertiliser was applied at planting”
t0“maize”
Claim · model-written summary
Maize plant nitrogen concentration at both harvests was highest with all fertilizer applied at planting.
- Organ / stage
- both silage and grain harveste0
- Treatment
- all fertiliser was applied at plantinge0
- Outcome
- Plant N concentratione0
- Direction
- higheste0
- Comparator
- control plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant N concentration at both silage and grain harvest was least in the control plots and highest where all fertiliser was applied at planting”
t0“maize”
Claim · model-written summary
The authors interpreted high nitrogen uptake without yield gain as probable luxury uptake.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but this probably luxury N uptake by these treatments as no yield advantage accrued.”
t0“maize”
Claim · model-written summary
Subsequent winter oat cover crop yield was significantly higher after fertilization than control.
- Taxon
- oats
Avena sativae0 - Treatment
- fertilised plote0
- Outcome
- yield of the subsequent winter cover crope0
- Direction
- highere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A winter cover crop of oats was sown to determine any carry over effect of the treatments. The irrigation treatment did not effect maize silage or grain yields. The control silage yields were significantly less than all fertilised treatments but maize silage and grain yields were similar for plots that received N fertiliser, thus fertiliser application method did not affect yields. Irrigation treatment did not affect crop nitrogen concentration but fertiliser had a large effect on N concentration of the silage, grain and crop residue. Plant N concentration at both silage and grain harvest was least in the control plots and highest where all fertiliser was applied at planting, but this probably luxury N uptake by these treatments as no yield advantage accrued. The yield of the subsequent winter cover crop was significantly higher in the fertilised plot compared with the control.”
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