01908naa a2200229 a 450000100080000000500110000800800410001910000170006024501440007726000090022152012020023065000250143265000220145765000250147965000270150465000200153165000150155165000130156665300210157965300250160077300530162515208612023-05-11       1968    bl uuuu     u00u1 u    #d1 aBLACK, A. L.  aNitrogen and phosphorus fertilization for production of crested wheatgrass and native grass in Northeastern Montana.h[electronic resource]  c1968  aAbstract; Nitrogen and N-P fertilization consistently increased forage yields of native grass and crested wheatgrass (Agropyron desertorum [Fisch.] Schult., ?Standard?). Plant responses were greatest the year of fertilization, but residual effects were significant 1 to 2 years later. Aplications of N at rates of 45 kg/ha or greater, regardless of P treatment, increased water-use efficiencies of both grasses 1.5- to 2.5-fold for 2 to 3 years. Increased wateruse efficiency was at least partly due to more efficient extraction of subsoil water. Plant P content was increased substantially by applied P the year of application and 3 years later, regardless of N treatment. Plant recovery of N applied alone at rates of 45 or 90 kg/ha for the 4-year period averaged 65.8% for crested wheatgrass and 60.0% for native grass. Recovery of N applied in combination with P averaged 73.1% for crested wheatgrass but only 38.2% for native grass. Phosphorus fertilizer stimulated uptake of soil N by both grasses about 20%. Nitrogen increased the 4-year production of crude protein 1.5- to 2.6-fold for both grasses. High N fertilizer rates were more economical than low N rates, regardless of P treatment.  aAgropyron desertorum  aForage production  aNitrogen fertilizers  aPhosphorus fertilizers  aPlant nutrition  aRangelands  aPastagem  aAdubacao quimica  aWater-use efficiency  tAgronomy Journalgv. 60, n. 2, p. 213-216, 1968.