Both temporal and spatial variation plays a major r ole in nutrient requirements and availability. This study was conducted to impro ve nutrient use efficiencies, demonstrate ability to visually identify nutrient n eeds throughout a cropping season, along with the evaluation of both soil nutrient rec ommendations across divergent environments and current producer fertilization man agement schemes. This project is an extension of the N-rich strip concept which is used to identify in season nitrogen deficiencies. Nutrient rich strips of nitrogen (N), phosphorus (P), potassium (K), and sulfur (S) were applied at 59 site years with 236 c omparisons across Oklahoma, on multiple soil types with a wide range of environmen tal conditions and wheat varieties. Nutrient rich strips were applied at a rate of 257. 6 kg ha of product to a 1.8 by 30.5 meter strip in producer fields. Urea (46-0-0), trip le super phosphate (0-20-0 ), potash (0-052) and gypsum (0-0-0-19) were used for sources of nitrogen, phosphorus, potassium and sulfur respectively. Composite surface (0-15 cm) an d subsurface (15-45 cm) soil samples were taken prior to application for soil nutrient r ecommendations. Normalized difference vegetative index (NDVI) data was collected from the nutrient rich strips and the farmer practice, where the GreenSeekerTM sensor was used to estimate biomass. At maturity three one m subplots were hand harvest from each strip. Sample s were threshed, grain weight recorded and grain samples analyzed for N, P , K and S content. Of 59 locations and 236 comparisons 17 responses were documented. M ost responses were due to underestimated yield goal, overestimated NUE or ide nt fi d by soil testing results. In the two years this study was conducted winter wheat gra in yield was increased with the addition of N at seven locations, P at seven locati ns, K at three locations. Over the 59 locations sampled there was no response to addition al S fertilizer. Soil testing proved to be an adequate method for nutrient recommendation. At 75% of the locations yield was maximized by the producer with his or her NPKS mana gement system. The study was however unable to identify if the management strate gies optimized yield economically.

Utilizing NPKS rich strips throughout Oklahoma winter wheat production

https://www.ipni.net/publication/bettercrops.nsf/beagle?OpenAgent&d=BC-2012-3&f=BC-2012-3.pdf

Improving soil fertility and wheat crop management through the long-term study of cereal crop rotations.

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Improving soil fertility and wheat crop management through the long-term study of cereal crop rotations.