Abstract
Abstract The objective of this study was to investigate the influence of different nitrogen fertiliser application levels in combination with different defoliation intervals on the dry matter (DM) production and water‐use efficiency of ryegrass (Lolium multiflorum,) cv. Midmar. In a field trial, four nitrogen levels (0, 150, 300 and 450 kg N ha−1) were combined with five defoliation intervals (every 2, 4, 6 and 8 weeks and twice a season). Soil moisture levels were measured with a neutron hydroprobe and were used to schedule irrigation. The dry matter production, nitrogen‐use efficiency (NUE), plant DM content and water‐use efficiency were influenced (P<0.01) by nitrogen level, defoliation interval, and the interaction between these factors. Total DM production varied from 64 to 20 922 kg DM ha−1. Dry matter production per unit of applied N decreased with an increase in N level within a defoliation interval. The plant DM content varied from 14.0% to 35.6%. The plant DM content decreased (P<0.05) with increasing N applications, while a lengthening of the defoliation interval resulted in an increase (P<0.05) in the DM content. No difference (P>0.05) was found in total water used when plants received N. Water‐use efficiency varied from 1.2 to 25.8 kg DM ha−1 mm−1 water received.
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Claims 8
Claim · model-written summary
Nitrogen level, defoliation interval and their interaction influenced dry matter production, nitrogen-use efficiency, dry matter content and water-use efficiency.
- Taxon
- ryegrass (Lolium multiflorum,)
Lolium multiflorume0 - Treatment
- nitrogen level, defoliation intervale1
- Outcome
- dry matter production, nitrogen‐use efficiency (NUE), plant DM contente1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ryegrass (Lolium multiflorum,)”
e1“The dry matter production, nitrogen‐use efficiency (NUE), plant DM content and water‐use efficiency were influenced (P<0.01) by nitrogen level, defoliation interval, and the interaction between these factors.”
Claim · model-written summary
Total dry matter production ranged from 64 to 20 922 kg DM ha−1.
- Taxon
- ryegrass (Lolium multiflorum,)Lolium multiflorume0
- Outcome
- Total DM productione1
- Value
- 64 to 20 922 kg DM ha−1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ryegrass (Lolium multiflorum,)”
e1“Total DM production varied from 64 to 20 922 kg DM ha−1.”
Claim · model-written summary
Dry matter production per applied nitrogen decreased as nitrogen level increased within a defoliation interval.
- Taxon
- ryegrass (Lolium multiflorum,)Lolium multiflorume0
- Treatment
- increase in N levele1
- Outcome
- Dry matter production per unit of applied Ne1
- Direction
- decreasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ryegrass (Lolium multiflorum,)”
e1“Dry matter production per unit of applied N decreased with an increase in N level within a defoliation interval.”
Claim · model-written summary
Plant dry matter content ranged from 14.0% to 35.6%.
- Taxon
- ryegrass (Lolium multiflorum,)Lolium multiflorume0
- Outcome
- plant DM contente1
- Value
- 14.0% to 35.6%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ryegrass (Lolium multiflorum,)”
e1“The plant DM content varied from 14.0% to 35.6%.”
Claim · model-written summary
Plant dry matter content decreased with increasing nitrogen applications.
- Taxon
- ryegrass (Lolium multiflorum,)Lolium multiflorume0
- Treatment
- increasing N applicationse1
- Outcome
- plant DM contente1
- Direction
- decreasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ryegrass (Lolium multiflorum,)”
e1“The plant DM content decreased (P<0.05) with increasing N applications”
Claim · model-written summary
Plant dry matter content increased with longer defoliation intervals.
- Taxon
- ryegrass (Lolium multiflorum,)Lolium multiflorume0
- Treatment
- lengthening of the defoliation intervale1
- Outcome
- DM contente1
- Direction
- increasee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ryegrass (Lolium multiflorum,)”
e1“a lengthening of the defoliation interval resulted in an increase (P<0.05) in the DM content”
Claim · model-written summary
Total water use did not differ when plants received nitrogen.
- Taxon
- ryegrass (Lolium multiflorum,)Lolium multiflorume0
- Treatment
- received Ne1
- Outcome
- total water usede1
- Direction
- No differencee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ryegrass (Lolium multiflorum,)”
e1“No difference (P>0.05) was found in total water used when plants received N.”
Claim · model-written summary
Water-use efficiency ranged from 1.2 to 25.8 kg DM ha−1 mm−1 water received.
- Taxon
- ryegrass (Lolium multiflorum,)Lolium multiflorume0
- Outcome
- Water‐use efficiencye1
- Value
- 1.2 to 25.8 kg DM ha−1 mm−1 water receivede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ryegrass (Lolium multiflorum,)”
e1“Water‐use efficiency varied from 1.2 to 25.8 kg DM ha−1 mm−1 water received.”