Response of Winter Wheat Grain Yield and Phosphorus Uptake to Foliar Phosphite Fertilization

Table 1

Treatment structure and abbreviations of Nutri-phite and soil applied fertilizers in hard red winter wheat in 2009/2010 and 2010/2011 cropping seasons in Oklahoma.

Treatment Structure	Abbreviations
No fertilizer control	Nontreated
Nutri-phite at 2–4 leaf stage^† and booting/flowering	Nutr2x
N at 100% crop need^‡ and P at 100% Sufficiency	NP 100%
P applied at 100% sufficiency	P 100%
P applied at 100% sufficiency + Nutri-phite at 2–4 leaf stage	P 100% + Nutr1x
P applied at 100% sufficiency + Nutri-phite at 2–4 leaf stage & booting/flowering	P 100% & Nutr2x
N applied at 75% of crop need and P applied at 80% sufficiency	N 75% & P 80%
N applied at 75% of crop need and P applied at 80% sufficiency + Nutri-phite at 2–4 leaf stage & booting/flowering	N 75% & P 80% & Nutr2x

†Treatments applied within a production year. Nutr1x: one application of Nutri-phite at 2–4 leaf stage (GS 12 to 14). Nutr2x: two applications of Nutri-phite at GS 2–4 and booting to flowering stages (GS 49–53).
^‡Nitrogen and phosphorus crop need was based on Oklahoma State University recommendation [31].