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Nitrogen distribution as affected by stocking density in a combined production system of energy crops and free-range pigs

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Nitrogen distribution as affected by stocking density in a combined production system of energy crops and free-range pigs. / Jørgensen, Uffe; Thuesen, Janni; Eriksen, Jørgen; Horsted, Klaus; Hermansen, John Erik; Kristensen, Kristian; Kongsted, Anne Grete.

I: Agroforestry Systems, Bind 92, Nr. 4, 2018, s. 987-999.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

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@article{9cbfcd55facd4908b44bf9431e07d9d8,
title = "Nitrogen distribution as affected by stocking density in a combined production system of energy crops and free-range pigs",
abstract = "Free-range pig production is typically associated with high risks of nitrogen (N) leaching due to the pigs excretory behaviour creating nitrogen {\textquoteleft}hotspots{\textquoteright} and rooting behaviour destroying the grass sward. This challenge is reinforced at high animal densities causing high nitrogen deposition. A combined production of pigs and perennial energy crops was hypothesized to benefit the environment because crops like miscanthus (Miscanthus), willow (Salix) and poplar (Populus) may persist despite pig rooting, take up nutrients and thereby minimise N-losses. Thus, the aim was to assess the risk of nitrate leaching by investigating the distribution of soil mineral N as influenced by stocking density in a system with zones of perennial energy crops and grass. For each of two seasons 36 growing pigs with an initial mean live weight of 55 kg (spring) and 48 kg (autumn), respectively, were separated into 6 paddocks of two stocking densities (117 and 367 m2 pig−1), respectively. Soil mineral N was measured in 0–25 and 25–75 cm depth at three occasions. N balances showed that N inputs exceeded N outputs by 626 and 185 kg N ha−1 for high and low stocking density. The pigs caused an uneven distribution of mineral N across the paddocks with highest contents in zones with willow & poplar. Stocking density had a significant effect on soil mineral N. Immediately after the second batch of pigs, average mineral N in the 0–75 cm soil layer was on average 227 and 83 kg N ha−1 at high and low stocking density, respectively. During winter period with no pigs, soil mineral N content in the 0–75 cm soil layer was reduced by almost 100 kg N ha−1 in paddocks with high stocking density against only 4 kg in paddocks with low stocking density. It is concluded that risk of elevated nitrate leaching compared to other cropping systems was low at the low stocking density, which therefore represents a promising pathway for a combined production of energy crops and free-range pigs.",
keywords = "cbio, free-range pigs, stocking density, energy crops, nitrogen balance, Nitrate leaching, extretory behaviour, cbio",
author = "Uffe J{\o}rgensen and Janni Thuesen and J{\o}rgen Eriksen and Klaus Horsted and Hermansen, {John Erik} and Kristian Kristensen and Kongsted, {Anne Grete}",
year = "2018",
doi = "10.1007/s10457-018-0200-3",
language = "English",
volume = "92",
pages = "987--999",
journal = "Agroforestry Systems",
issn = "0167-4366",
publisher = "Springer",
number = "4",

}

RIS

TY - JOUR

T1 - Nitrogen distribution as affected by stocking density in a combined production system of energy crops and free-range pigs

AU - Jørgensen, Uffe

AU - Thuesen, Janni

AU - Eriksen, Jørgen

AU - Horsted, Klaus

AU - Hermansen, John Erik

AU - Kristensen, Kristian

AU - Kongsted, Anne Grete

PY - 2018

Y1 - 2018

N2 - Free-range pig production is typically associated with high risks of nitrogen (N) leaching due to the pigs excretory behaviour creating nitrogen ‘hotspots’ and rooting behaviour destroying the grass sward. This challenge is reinforced at high animal densities causing high nitrogen deposition. A combined production of pigs and perennial energy crops was hypothesized to benefit the environment because crops like miscanthus (Miscanthus), willow (Salix) and poplar (Populus) may persist despite pig rooting, take up nutrients and thereby minimise N-losses. Thus, the aim was to assess the risk of nitrate leaching by investigating the distribution of soil mineral N as influenced by stocking density in a system with zones of perennial energy crops and grass. For each of two seasons 36 growing pigs with an initial mean live weight of 55 kg (spring) and 48 kg (autumn), respectively, were separated into 6 paddocks of two stocking densities (117 and 367 m2 pig−1), respectively. Soil mineral N was measured in 0–25 and 25–75 cm depth at three occasions. N balances showed that N inputs exceeded N outputs by 626 and 185 kg N ha−1 for high and low stocking density. The pigs caused an uneven distribution of mineral N across the paddocks with highest contents in zones with willow & poplar. Stocking density had a significant effect on soil mineral N. Immediately after the second batch of pigs, average mineral N in the 0–75 cm soil layer was on average 227 and 83 kg N ha−1 at high and low stocking density, respectively. During winter period with no pigs, soil mineral N content in the 0–75 cm soil layer was reduced by almost 100 kg N ha−1 in paddocks with high stocking density against only 4 kg in paddocks with low stocking density. It is concluded that risk of elevated nitrate leaching compared to other cropping systems was low at the low stocking density, which therefore represents a promising pathway for a combined production of energy crops and free-range pigs.

AB - Free-range pig production is typically associated with high risks of nitrogen (N) leaching due to the pigs excretory behaviour creating nitrogen ‘hotspots’ and rooting behaviour destroying the grass sward. This challenge is reinforced at high animal densities causing high nitrogen deposition. A combined production of pigs and perennial energy crops was hypothesized to benefit the environment because crops like miscanthus (Miscanthus), willow (Salix) and poplar (Populus) may persist despite pig rooting, take up nutrients and thereby minimise N-losses. Thus, the aim was to assess the risk of nitrate leaching by investigating the distribution of soil mineral N as influenced by stocking density in a system with zones of perennial energy crops and grass. For each of two seasons 36 growing pigs with an initial mean live weight of 55 kg (spring) and 48 kg (autumn), respectively, were separated into 6 paddocks of two stocking densities (117 and 367 m2 pig−1), respectively. Soil mineral N was measured in 0–25 and 25–75 cm depth at three occasions. N balances showed that N inputs exceeded N outputs by 626 and 185 kg N ha−1 for high and low stocking density. The pigs caused an uneven distribution of mineral N across the paddocks with highest contents in zones with willow & poplar. Stocking density had a significant effect on soil mineral N. Immediately after the second batch of pigs, average mineral N in the 0–75 cm soil layer was on average 227 and 83 kg N ha−1 at high and low stocking density, respectively. During winter period with no pigs, soil mineral N content in the 0–75 cm soil layer was reduced by almost 100 kg N ha−1 in paddocks with high stocking density against only 4 kg in paddocks with low stocking density. It is concluded that risk of elevated nitrate leaching compared to other cropping systems was low at the low stocking density, which therefore represents a promising pathway for a combined production of energy crops and free-range pigs.

KW - cbio

KW - free-range pigs

KW - stocking density

KW - energy crops

KW - nitrogen balance

KW - Nitrate leaching

KW - extretory behaviour

KW - cbio

U2 - 10.1007/s10457-018-0200-3

DO - 10.1007/s10457-018-0200-3

M3 - Journal article

VL - 92

SP - 987

EP - 999

JO - Agroforestry Systems

JF - Agroforestry Systems

SN - 0167-4366

IS - 4

ER -