Abstract
Abstract Farming practices can have significant effects on important soil processes, including nitrogen (N) dynamics and nitrate leaching. A lysimeter experiment was conducted to determine differences in N leaching resulting from past and current crop management practices. Intact monolith lysimeters (50cm diam. × 70cm deep) were taken from sites of the same soil type that had either been under long‐term organic or conventional crop management. These were then managed according to established organic and conventional practices over 2½ years using the same crop rotation (barley ( Hordeum vulgare L.), maize ( Zea mays L.), rape ( Brassica napus L. ssp. oleífera ) plus a lupin green manure ( Lupinus angustifolius L.)) and two fertiliser regimes, resulting in four treatments based on soil management history and current fertilisation strategy. Dry matter yield of each crop was determined after harvest and leachates were collected after significant rainfall events and analysed for total mineral N concentrations. Mineral fertilisation had a clear positive effect on yields of the first crop, whereas there were no considerable differences between treatments for the last crop owing to a significant positive effect of green manure incorporation on yields. Although there was a trend of lower mineral N leaching from organically fertilised soils (organic management: 24.2 kg N ha ‐1 ; conventional management: 28.6), differences in N losses were not statistically significant between treatments. This shows that under the experimental conditions, leaching losses and crop yields were more strongly influenced by crop rotation and green manuring than by the presence or absence of mineral fertilisation. Overall, the study highlights the benefits of including a green manure in the crop rotation of any farming system.
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Claims 6
Claim · model-written summary
Mineral fertilization increased yield of the first crop.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- Mineral fertilisatione1
- Outcome
- yields of the first crope1
- Direction
- positive effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“barley ( Hordeum vulgare L.), maize ( Zea mays L.), rape ( Brassica napus L. ssp. oleífera ) plus a lupin green manure ( Lupinus angustifolius L.)”
e1“Mineral fertilisation had a clear positive effect on yields of the first crop”
Claim · model-written summary
Treatments had no considerable yield differences for the last crop.
- Taxon
- rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse0 - Outcome
- last crope1
- Direction
- no considerable differencese1
- Comparator
- treatmentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“barley ( Hordeum vulgare L.), maize ( Zea mays L.), rape ( Brassica napus L. ssp. oleífera ) plus a lupin green manure ( Lupinus angustifolius L.)”
e1“there were no considerable differences between treatments for the last crop”
Claim · model-written summary
Green manure incorporation significantly increased yields.
- Taxon
- rapeBrassica napuse0
- Treatment
- green manure incorporatione1
- Outcome
- yieldse1
- Direction
- positive effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley ( Hordeum vulgare L.), maize ( Zea mays L.), rape ( Brassica napus L. ssp. oleífera ) plus a lupin green manure ( Lupinus angustifolius L.)”
e1“a significant positive effect of green manure incorporation on yields”
Claim · model-written summary
Organic fertilization showed a nonsignificant trend toward lower mineral nitrogen leaching than conventional management.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- organically fertilised soilse1
- Outcome
- mineral N leachinge1
- Direction
- lowere1
- Value
- 24.2 kg N ha ‐1e1
- Qualifier
- 28.6e1
- Comparator
- conventional managemente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley ( Hordeum vulgare L.), maize ( Zea mays L.), rape ( Brassica napus L. ssp. oleífera ) plus a lupin green manure ( Lupinus angustifolius L.)”
e1“there was a trend of lower mineral N leaching from organically fertilised soils (organic management: 24.2 kg N ha ‐1 ; conventional management: 28.6), differences in N losses were not statistically significant between treatments”
Claim · model-written summary
Crop rotation and green manuring influenced leaching and yields more strongly than mineral fertilization.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- crop rotation and green manuringe1
- Outcome
- leaching losses and crop yieldse1
- Direction
- more strongly influencede1
- Comparator
- presence or absence of mineral fertilisatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley ( Hordeum vulgare L.), maize ( Zea mays L.), rape ( Brassica napus L. ssp. oleífera ) plus a lupin green manure ( Lupinus angustifolius L.)”
e1“leaching losses and crop yields were more strongly influenced by crop rotation and green manuring than by the presence or absence of mineral fertilisation”
Claim · model-written summary
The authors recommend including green manure in crop rotations across farming systems.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- including a green manure in the crop rotation of any farming systeme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley ( Hordeum vulgare L.), maize ( Zea mays L.), rape ( Brassica napus L. ssp. oleífera ) plus a lupin green manure ( Lupinus angustifolius L.)”
e1“benefits of including a green manure in the crop rotation of any farming system”
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