WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Friday, September 21, 2018

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4077. Mason, J.L. and J.E. Miltimore. 1959. Increase in yield and protein content of native bluebunch wheatgrass from nitrogen fertilization.. Canadian J. Plant Sci. 39:501-504.
Native bluebunch wheatgrass in Okanagan Valley (11" precip.) showed marked response to nitrogen fertilization. Dry matter production doubled with 60N added as ammonium nitrate, protein increased from 3.9 to 6.2 %. Fertilizer also increased ground cover by the desirable grasses.

4358. McHenry, J.R., L.T. Alexander and L.L. Zook. 1946. Carbon and nitrogen contents of a chernozem soil as affected by age of perennial grass sods.. Soil Sci. Soc. Am. Proc. 11:407-412.
Compared soil organic carbon and nitrogen changes due to perennial grass established 0-9 yrs; C and N decreased under all treatments, although the changes were slight with more than 6 yr sod; only with >6 yr sod were C and N % significantly greater than continuous cultivation; the system may have been nutrient limited, or it may take longer to develop equilibrium; root mass ranged from 1600-5200 lb/ac/yr. T: carbon and nitrogen levels; root mass.

9143. Birch, T.L. and R.L. Lang.. 1961. Dryland grass seed production as affected by three rates of nitrogen fertilization.. WY Agr. Expt. Sta. Bull. 382.

9772. Vigil, M.F. and D.E. Kissel. 1988. Evaluation of urea nitric phosphate for cool season grasses.. Kansas Fertilizer Research, p. 30-31..
Previous studies have compared urea and ammonium nitrate for forage production of cool-season grasses. Results from these studies have generally been similar, although sometimes production has been less with urea in the first year or two of the study. Lower forage production from urea treatment than from ammonium nitrate (AN) is usually attributed to ammonia loss from urea or perhaps increased immobilization of urea. The new urea-nitric phosphate (UNP) fertilizer offers the potential to reduce NH3 loss and or immobilization, therby resulting in improved forage production.

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