On‐Farm Winter Wheat Response to Nitrogen‐, Phosphorus‐, Potassium‐, and Sulfur‐Rich Strips in Oklahoma

Abstract

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 nutrientrich 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.

The effect of nitrogen-sulphur fertilizer with nitrification inhibitor on winter wheat (Triticum aestivum L.) nutrition

“…The effect of sulphur applied with nitrogen during the vegetation was therefore insignificant. This correlates with other published results [ [67] , [68] , [69] , [70] , [71] ], even if the increasing yield after the N + S application is often discussed. The non-significant result of co-application of N and S can be possibly explained by the relatively low S requirement of wheat and its late application in the BBCH 30–32.…”

On farm evaluation of preplant soil test P and K in double‐crop soybeans

“…Variability in climate and environment across the state of Oklahoma presents issues with accurately depicting and replicating producers’ conditions on the limited amount of university‐managed research areas. Although researchers aim to manage research fields spatially, studies have shown that on‐farm studies will allow meaningful data collection for a given region (Abit et al., 2017; Kyveryga et al., 2018). To conduct research across a range of highly varied soil nutrient status, studies were established and harvested across Oklahoma at 23 and 26 on‐farm locations in the 2016 and 2017 growing seasons, respectively, with no repeated locations.…”

The agrochemical state of sod-podzolic soils of Western Polissya in the conditions of anthropogenesis

“…До важливих агрохімічних показників родючості ґрунту поряд з гумусом належать вміст азоту, фосфору і калію. Вплив цих елементів живлення на врожайність сільськогосподарських культур на різних типах ґрунтів та стадіях росту рослин, а також трансгенні підходи до підвищення ефективності їхнього засвоєння розглядаються в багатьох працях (Abit et al, 2017;Anh, 2017;Teng, 2017).…”

“…Така сама закономірність реєструється й у показниках умісту гумусу. З низькими показниками азоту пов'язана і невисока продуктивність культур, що підтверджують і праці Abit et al (2017), Anh (2017), тому застосування азотних добрив є обов'язковим.…”