Abstract
ABSTRACT Autumn grazing of high‐yielding forage crops such as fodder beet (FB) has increased in popularity in many regions of New Zealand. During grazing, large amounts of urinary nitrogen (N) is returned to the soil which is at risk of leaching. This study evaluated using two different catch crops of oats or Italian ryegrass (‘Italian RG’) to reduce the risk of N leaching both after FB grazing by lactating dairy cows and after lifting (i.e. un‐grazed FB) in autumn. During FB grazing, cows grazed either (i) high [40% of diet dry matter (DM), with pasture; FB40] or (ii) low (25% of diet DM, with pasture; FB25) FB allocations. Both Italian RG and oats reduced soil mineral N (0–90 cm depth) by 16%–37% by August, and 53%–58% by October, compared with a fallow control (115 and 100 kg N ha −1 for August and October, respectively). The greatest reductions in soil mineral N were from oats, largely attributed to higher DM yields resulting in greater N uptake. Furthermore, the total amounts of soil mineral N in the soil after grazing differed between FB allocation treatments and lifted FB (FB25 > FB40 > lifted FB), in proportion to urinary‐N inputs and associated dietary N intake.
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Claims 6
Claim · model-written summary
Italian ryegrass reduced soil mineral N by 16%–37% in August against fallow.
Verbatim
e0“Both Italian RG and oats reduced soil mineral N (0–90 cm depth) by 16%–37% by August, and 53%–58% by October, compared with a fallow control”
t0“fodder beet”
Claim · model-written summary
Oats reduced soil mineral N by 16%–37% in August against fallow.
- Taxon
- oats
Avena sativae0 - Treatment
- oatse0
- Outcome
- soil mineral Ne0
- Direction
- reducede0
- Value
- 16%–37%e0
- Qualifier
- by Auguste0
- Comparator
- fallow controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both Italian RG and oats reduced soil mineral N (0–90 cm depth) by 16%–37% by August, and 53%–58% by October, compared with a fallow control”
t0“fodder beet”
Claim · model-written summary
Italian ryegrass reduced soil mineral N by 53%–58% in October against fallow.
Verbatim
e0“Both Italian RG and oats reduced soil mineral N (0–90 cm depth) by 16%–37% by August, and 53%–58% by October, compared with a fallow control”
t0“fodder beet”
Claim · model-written summary
Oats reduced soil mineral N by 53%–58% in October against fallow.
- Taxon
- oatsAvena sativae0
- Treatment
- oatse0
- Outcome
- soil mineral Ne0
- Direction
- reducede0
- Value
- 53%–58%e0
- Qualifier
- by Octobere0
- Comparator
- fallow controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both Italian RG and oats reduced soil mineral N (0–90 cm depth) by 16%–37% by August, and 53%–58% by October, compared with a fallow control”
t0“fodder beet”
Claim · model-written summary
Oats produced the largest reduction in soil mineral nitrogen, attributed to higher dry matter yield and uptake.
- Taxon
- oatsAvena sativae0
- Treatment
- oatse0
- Outcome
- reductions in soil mineral Ne0
- Direction
- greateste0
- Qualifier
- higher DM yields resulting in greater N uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The greatest reductions in soil mineral N were from oats, largely attributed to higher DM yields resulting in greater N uptake”
t0“fodder beet”
Claim · model-written summary
Soil mineral N after grazing ranked FB25 above FB40 above lifted fodder beet, proportional to urinary nitrogen input.
Verbatim
e0“the total amounts of soil mineral N in the soil after grazing differed between FB allocation treatments and lifted FB (FB25 > FB40 > lifted FB), in proportion to urinary‐N inputs and associated dietary N intake”
t0“fodder beet”