Abstract
A field trial was conducted for 3 yr to monitor the response of seed rape (Brassica napus L.) to several fertilizer treatments at two seeding dates. The fertilizer treatments consisted of 0–200 kg N/ha, 0–100 kg P/ha and 0–180 kg K/ha broadcast with or without 4.2–7–0 kg N-P-K/ha banded below the seed. Total yield, seed yield, plant height, lodging index, seed contents of oil and N, and leaf contents of N, P, K, Ca, Mg, Mn, Cu, Zn and B were measured. Rape responded to broadcast N with maximum seed yields at 100 kg N/ha independent of seeding date or banded fertilizer. Leaf concentrations of N, P and K were influenced by nitrogen supply but the critical leaf N concentration varied considerably. Response to 7 kg P/ha banded or 25 kg P/ha broadcast occurred when the soil P was less than 10 μg/cc. The critical leaf P concentration was less than 0.2%. Very little response to broadcast K was observed with a soil test of approximately 60 μg K/cc. The early seeding date (late April to early May) increased seed yields an average of 225 kg/ha over the late seeding date (late May) and the band placement of fertilizer increased seed yields an average of 55 kg/ha over comparable treatments without banded fertilizer. Seed yield and leaf elemental composition are presented as functions of broadcast nitrogen, phosphorus and potassium.
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Claims 8
Claim · model-written summary
Rape seed yield was maximal at 100 kg N/ha of broadcast N, independent of seeding date or banded fertilizer.
- Taxon
- Rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse2 - Treatment
- broadcast Ne2
- Outcome
- seed yieldse2
- Direction
- maximume2
- Value
- 100 kg N/hae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e1“response of seed rape (Brassica napus L.) to several fertilizer treatments at two seeding dates”
e2“Rape responded to broadcast N with maximum seed yields at 100 kg N/ha independent of seeding date or banded fertilizer”
t0“COMPOSITION OF RAPE”
Claim · model-written summary
Response to 7 kg P/ha banded or 25 kg P/ha broadcast occurred when soil P was below 10 μg/cc.
- Taxon
- RAPEBrassica napust0
- Treatment
- 7 kg P/ha banded or 25 kg P/ha broadcaste3
- Outcome
- Responsee3
- Qualifier
- when the soil P was less than 10 μg/cce3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Response to 7 kg P/ha banded or 25 kg P/ha broadcast occurred when the soil P was less than 10 μg/cc”
t0“COMPOSITION OF RAPE”
Claim · model-written summary
Very little rape response to broadcast K occurred at a soil test of about 60 μg K/cc.
- Taxon
- RAPEBrassica napust0
- Treatment
- broadcast Ke4
- Outcome
- responsee4
- Direction
- Very littlee4
- Qualifier
- a soil test of approximately 60 μg K/cce4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Very little response to broadcast K was observed with a soil test of approximately 60 μg K/cc”
t0“COMPOSITION OF RAPE”
Claim · model-written summary
Early seeding increased rape seed yield by an average of 225 kg/ha over late seeding.
- Taxon
- RAPEBrassica napust0
- Treatment
- early seeding date (late April to early May)e5
- Outcome
- seed yieldse5
- Direction
- increasede5
- Value
- 225 kg/hae5
- Comparator
- late seeding date (late May)e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The early seeding date (late April to early May) increased seed yields an average of 225 kg/ha over the late seeding date (late May)”
t0“COMPOSITION OF RAPE”
Claim · model-written summary
Band placement of fertilizer increased rape seed yield by an average of 55 kg/ha over comparable treatments without banded fertilizer.
- Taxon
- RAPEBrassica napust0
- Treatment
- band placement of fertilizere6
- Outcome
- seed yieldse6
- Direction
- increasede6
- Value
- 55 kg/hae6
- Comparator
- comparable treatments without banded fertilizere6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“the band placement of fertilizer increased seed yields an average of 55 kg/ha over comparable treatments without banded fertilizer”
t0“COMPOSITION OF RAPE”
Claim · model-written summary
The critical rape leaf P concentration was less than 0.2%.
- Taxon
- RAPEBrassica napust0
- Organ / stage
- leafe7
- Outcome
- critical leaf P concentratione7
- Value
- less than 0.2%e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The critical leaf P concentration was less than 0.2%”
t0“COMPOSITION OF RAPE”
Claim · model-written summary
Leaf N, P and K concentrations of rape were influenced by nitrogen supply.
- Taxon
- RAPEBrassica napust0
- Treatment
- nitrogen supplye7
- Outcome
- Leaf concentrations of N, P and Ke7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Leaf concentrations of N, P and K were influenced by nitrogen supply but the critical leaf N concentration varied considerably”
t0“COMPOSITION OF RAPE”
Claim · model-written summary
The critical rape leaf N concentration varied considerably.
- Taxon
- RAPEBrassica napust0
- Organ / stage
- leafe7
- Outcome
- critical leaf N concentratione7
- Qualifier
- varied considerablye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Leaf concentrations of N, P and K were influenced by nitrogen supply but the critical leaf N concentration varied considerably”
t0“COMPOSITION OF RAPE”
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