Abstract
Core Ideas Thirty‐two percent of the locations had an increase in grain yield with increased nutrient inputs. Wheat response to additional N was potentially due to underestimated yield potential or N losses attributable to ammonia losses, immobilization, leaching, or environmental conditions. Response of wheat to additional P was likely a result of underapplication of P fertilizer, especially on low‐pH soils Winter wheat grain yield response to K fertilization in the high soil test K environment was potentially due to enhanced vegetative growth of wheat during drought conditions. Soil test SO 4 –S levels were adequate to produce grain yields above estimated yield goals. Temporal and spatial variations both play a major role in nutrient requirements and availability. This study was conducted to highlight variability in nutrient requirements across landscapes, soil types, and environments, and to evaluate if Oklahoma producers’ current fertilization management schemes for nitrogen (N), phosphorus (P), potassium (K), and sulfur (S) are maximizing winter wheat ( Triticum aestivum L.) grain yields. Nutrient‐rich strips of N, P, K, and S and a farmer‐practice strip were established in 2011–2012 and 2012–2013 at 42 and 40 locations in Oklahoma, respectively. Urea (46–0–0), triple super phosphate (0–46–0), potash (0–0–60), and gypsum (19% S) were used as sources of N, P 2 O 5 , K 2 O, and S, respectively. The N‐, P‐, K‐, and S‐rich strips were applied with an additional 105 lb N/acre, 105 lb P 2 O 5 /acre, 119 lb K 2 O/acre, and 43 lb S/acre, respectively, on top of the farmer's fertility practice. Surface (0–6 inches) and subsurface (6–12 inches) soil samples were collected prior to nutrient applications. Of the 82 nutrient‐rich strip locations established, 59 were harvested. Winter wheat grain yield was increased with the addition of N at seven locations, P at nine locations, and K at eight locations. No yield response to additional S fertilizer was observed at any location. A total of 19 locations, 32%, responded to the addition of N, P, or K, demonstrating that there is opportunity for Oklahoma wheat producers to increase yield through improved nutrient management.
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Claims 6
Claim · model-written summary
Additional N increased winter wheat grain yield at seven locations.
- Taxon
- Winter wheat
Triticum aestivume0 - Treatment
- addition of Ne0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- seven locationse0
- Comparator
- farmer's fertility practicee1
- Setting
- locationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Winter wheat grain yield was increased with the addition of N at seven locations”
e1“on top of the farmer's fertility practice”
Claim · model-written summary
Additional P increased winter wheat grain yield at nine locations.
- Taxon
- Winter wheatTriticum aestivume0
- Treatment
- Pe0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- nine locationse0
- Comparator
- farmer's fertility practicee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Winter wheat grain yield was increased with the addition of N at seven locations, P at nine locations”
e1“on top of the farmer's fertility practice”
Claim · model-written summary
Additional K increased winter wheat grain yield at eight locations.
- Taxon
- Winter wheatTriticum aestivume0
- Treatment
- Ke0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- eight locationse0
- Comparator
- farmer's fertility practicee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Winter wheat grain yield was increased with the addition of N at seven locations, P at nine locations, and K at eight locations”
e1“on top of the farmer's fertility practice”
Claim · model-written summary
Additional S fertilizer produced no observed winter wheat yield response at any location.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- additional S fertilizere0
- Outcome
- yield responsee0
- Direction
- Noe0
- Comparator
- farmer's fertility practicee1
- Setting
- any locatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“No yield response to additional S fertilizer was observed at any location”
e1“on top of the farmer's fertility practice”
Claim · model-written summary
N, P, or K additions raised yield at 19 locations, or 32%.
- Taxon
- Winter WheatTriticum aestivumt0
- Outcome
- responded to the addition of N, P, or Ke0
- Value
- 32%e0
- Setting
- locationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“A total of 19 locations, 32%, responded to the addition of N, P, or K”
Claim · model-written summary
Improved nutrient management offers Oklahoma wheat producers an opportunity to increase yield.
- Taxon
- wheatTriticum aestivume0
- Outcome
- increase yield through improved nutrient managemente0
- Setting
- Oklahomae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“opportunity for Oklahoma wheat producers to increase yield through improved nutrient management”
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