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- Delin, Mattias, et al.
(författare)
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Ascending evacuation - Walking speed in stairs as a function of height
- 2015
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Ingår i: Human Behaviour in fire : 6th International Symposium - 6th International Symposium. - 9780993393303 ; , s. 155-160
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Konferensbidrag (refereegranskat)abstract
- During ascending evacuation in long stairs, there is reason to believe that factors such as fatigue, and change in human behaviour will influence the possibility of satisfactory evacuation and affect the ascending walking speed. Based on these assumption, a 2-year research project was initiated at Lund University. This paper gives a brief description of the project and highlight some initial findings according ascending walking speed and effects of fatigue.
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| 4. |
- Delin, Sofia
(författare)
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Fertilizer value of phosphorus in different residues
- 2016
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Ingår i: Soil Use and Management. - : Wiley. - 0266-0032 .- 1475-2743. ; 32, s. 17-26
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Tidskriftsartikel (refereegranskat)abstract
- The phosphorus (P) fertilizer effect of a range of commonly available manure, waste treatment and by-product residues was tested in pot, field and incubation experiments. The effect of the residues on P offtake was compared with that of commercial mineral P (super phosphate) to calculate the mineral fertilizer equivalent (MFE). Possible relationships between MFE and P extractable from residues using different agents (ammonium lactate, citrate, water) were examined. Dry matter yield and P concentration were measured in ryegrass grown in pots amended with 14 different residues. The effect on the first cut (after 5 weeks) was significantly higher for residues with a low organic matter content, for example ash and biogas residues (MFE = 74-85%), than for many other products with higher organic matter content, for example meat meal (MFE = 44%), cattle slurry (MFE = 57%) and sewage sludge (MFE = 0-37%). However, the effect on two combined cuts (after 11 weeks) was more similar between residues (MFE = 40-60% for most residues). Ammonium lactate-extractable P (P-AL) in residues correlated better with MFE (r2 = 0.48) than water-extractable or citrate-extractable P. Grain yield and P concentration were measured in a field experiment with spring wheat fertilized with four different residues. Pelleted meat meal had a similar effect on yield and P offtake as mineral fertilizer P, whereas two different sewage sludge and chicken manure had approximately 50% of the mineral fertilizer effect. The effect of residues on soil P-AL (the Swedish measure of easily available soil P) in the incubation experiment showed no correlation with MFE from the pot experiments.
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| 8. |
- Delin, Sofia, et al.
(författare)
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Optimal Placement of Meat Bone Meal Pellets to Spring Oats
- 2018
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Ingår i: Frontiers in sustainable food systems. - : Frontiers Media SA. - 2571-581X. ; 2
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Tidskriftsartikel (refereegranskat)abstract
- New technology makes it possible to apply organic fertilizers with higher precision, and organic producers want to know how to exploit these new possibilities to make their production more efficient. This study investigated the effect of band application (in different positions) of pelleted organic fertilizer, compared with broadcasting, on grain yield and weed density in spring oats (Avena sativa L.). Six microplot field experiments were carried out on silty clay and sandy loam in Sweden during the growing season of 2014-2016. In oats seeded at 25 cm row spacing, pelleted meat bone meal was band-applied at one of three distances from the crop row (0, 4, and 12.5 cm) and at two or three incorporation depths (1 and 4 cm on silty clay and 1, 4, and 6 cm on loamy sand). These treatments were compared with broadcast spreading, mineral nitrogen fertilizer, and an unfertilized control. On both soil types, fertilizer placement 4 cm from the crop and 4-6 cm incorporation depth gave the highest yield and crop nitrogen uptake. Yield in this treatment was 800 kg ha(-1) higher on clay soil and 1,100 kg ha(-1) higher on sandy loam compared with the same organic fertilizer applied by broadcasting, an 80-150% yield increase. On the sandy loam, distance from the crop row had a more significant effect on grain yield (p < 0.001) than soil incorporation depth (p = 0.07). On the silty clay, crop yield was significantly influenced by incorporation depth (p = 0.003) and distance from the crop row (p = 0.04). In five experiments, mineral N fertilizer equivalent (MFE) increased from on average 63% with broadcasting to 85% with placement 4 cm from the crop row and 4 cm incorporation depth. Weed biomass was significantly affected by fertilizer placement on the clay soil, with higher weed biomass with deeper incorporation (p = 0.045) and greater distance from the crop row (p = 0.049). On the sandy loam, there was a tendency for larger weed plants at greater distance from the crop row (p = 0.13) except when seeds and pellets were placed together, which gave the highest weed weight, probably due to lower competition from the crop in this treatment.
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| 10. |
- Delin, Sofia, et al.
(författare)
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Pelleterad organisk gödsel - mylla och placera nära såraden
- 2017
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Forskare vid SLU undersöker i pågående försök hur skörden påverkas av att placera pelleterad organisk gödsel på olika avstånd från såraden och att mylla den till olika djup. Preliminära resultat i havre visar att placering fyra centimeter från raden och fyra centimeters myllningsdjup gav störst skörd.
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