Abstract
Increased canola production costs and acres have driven Oklahoma (OK) farmers to ask more questions about their nutrient management recommendations in their production system. A study was conducted in 2011–2013 at Lahoma and Perkins, OK, to evaluate the effect of applying diammonium phosphate (DAP, 18-20-0:N-P-K) directly with seed on crop stand, grain yield, and grain quality of canola. In addition, the impact of proportion nitrogen (N) applied as a preplant and topdress was also evaluated. Diammonium phosphate was banded with the seed at planting at 0, 17, 34, 51, 67, and 84 kg DAP ha −1 . Remaining N was applied as urea (46-0-0) either as split (40% preplant and 60% topdress) application or as topdress only. Stand count reduction of up to 71% was observed with seed-placed DAP. However, loss of stand did not impair grain yield due to canola’s ability to compensate for open areas via branching. Application of DAP of up to 84 kg ha −1 with seed may be possible; however, soil and climatic conditions should be considered when deciding how much DAP will be placed with seed. Moreover, when climatic conditions limit early season growth and favor late spring growth, applying all N at topdress (no preplant) tended to provide greater canola grain yield.
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Claims 4
Claim · model-written summary
Seed-placed DAP reduced canola stand count by up to 71%.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napust0 - Treatment
- seed-placed DAPe1
- Outcome
- Stand counte1
- Direction
- reductione1
- Value
- up to 71%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Winter Canola”
e1“Stand count reduction of up to 71% was observed with seed-placed DAP”
Claim · model-written summary
The loss of stand from seed-placed DAP did not impair canola grain yield, because canola compensates for open areas via branching.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- seed-placed DAPe1
- Outcome
- grain yielde2
- Direction
- did not impaire2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Canola”
e1“Stand count reduction of up to 71% was observed with seed-placed DAP”
e2“loss of stand did not impair grain yield”
Claim · model-written summary
Applying DAP of up to 84 kg ha-1 with seed may be possible, but soil and climatic conditions should be considered when deciding how much DAP is placed with seed.
- Taxon
- canolaBrassica napus var. napust0
- Outcome
- how much DAP will be placed with seede2
- Value
- up to 84 kg hae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Canola”
e1“Application of DAP of up to 84 kg ha”
e2“soil and climatic conditions should be considered when deciding how much DAP will be placed with seed”
Claim · model-written summary
When climatic conditions limit early season growth and favor late spring growth, applying all N at topdress (no preplant) tended to give greater canola grain yield.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- applying all N at topdress (no preplant)e0
- Outcome
- canola grain yielde0
- Direction
- greatere0
- Qualifier
- when climatic conditions limit early season growth and favor late spring growthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when climatic conditions limit early season growth and favor late spring growth, applying all N at topdress (no preplant) tended to provide greater canola grain yield”
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