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Sveriges lantbruksuniversitetSwedish University of Agricultural Scienceswww.slu.se
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Optimal placement of pelleted organic fertilizer in spring oat
Lena Engström,PhD, ResearcherDepartment of Soil and [email protected]
Sofia DelinPhD, Associate professorDepartment of Soil and [email protected]
Placement of organic fertilizer close to the crop row and incorporation deeper in the soil can improve yield and reduce weed biomass compared to broadcasting and fertilizing shallowly between rows.
This project is funded by SLU Ekoforsk
The effects on crop nitrogen uptake, grain yield and weed abundance of placing pelleted meat bone meal (MBM) at different soil depths and at different distances from the seed row was tested in two field experiments in Sweden.
Anneli LundkvistPhD, Associate professorDepartment of Crop production [email protected]
Seeds and pellets wereplaced at certain depthsby knocking down ironplates.
The treatments wereperformed in 0.7 m2
plots randomised withinfour blocks.
Weeds were countedtwice and harvested at ear emergance.
The two middle rowswere cut at ripening and N in straw and grains measured.
Materials and methods
Location of experiments
Results
Nine different placements of pellet ( ) from seed ( ) were compared withbroadcasting, no fertilization and mineral N fertilizer ( ).
One experiment on clay soil and one on sandysoil.
25 cm
100 cm
70 c
m
Aboveground crop nitrogen
Clay soil Sandy soil
Gra
in y
ield
incr
ease
, kg
ha-1 Clay soil Sandy soil
Grain yieldIncrease with different placement compared to broadcast.
Abo
vegr
ound
wee
dN
, kg
N h
a-1
Weeds
Both on the clay soil and the sandy soil, there was a tendency for higher grain yield the closer to crop row (p=0.06) and the deeper in the soil (p=0.06-0.07) the pellets was placed.
Aboveground nitrogen was much higher on the sandy soil than on the clay soil. The differences between treatments were similar as for grain yield.
On the clay soil, the weed biomass was significantly higher in two treatments, one with broadcasting and one with placement far from the crop row. On the sandy soil, there were no significant differences between treatments in weed biomass.
Clay soil Sandy soil
1 cm 4 cm 8 cm incorporation
,
broadcast no N mineral fertilizerAbo
vegr
ound
crop
N, k
g N
ha
-1
