Nitrogen and phosphorus fertilization of lehmann lovegrass on some range soils from Southern Arizona
2000
Eltom, O.A.M. (Land and Water Research Centre, Wad Medani (Sudan)) | Stroehlein, J.I. (University of Arizona, (Tucson). Soil Water Engineering Dept. (USA))
Lehmann lovegrass, Eragostis Lehmanna Nees, one the important range grasses in Arizona, was grown in the greenhouse on the surface soil (0.45 cm) of five different soil series, representing four soil orders, and fertilized with nitrogen (N) and phosphorus (P) and the uptake of a number of nutrients was determined. For the lehmann lovergrass grown on the Mollisols, Alfisols and Aridisols there was no significant difference (0.05 level) between the N content of the grass grown on the N treatment (100 mg/kg) soil and the control, but its content in the N+P treatments (100 mg N+100 mg P)/kg soil in two soils (Mollisols and Alfisols) were lower than in the other two treatments, probably due to the dilution effect of the vigorus vegetative growth. The phosphorus contents were significantly higher in the N+P treatments while there were no significant differences between the magnesium (Mg) contents. Soil samples from two soil series before and after planting were taken from treatment N+P and analyzed for the contents of N,P, zinc (Zn), manganese (Mn),iron (Fe), copper (Cu) and selenium (Se). N and P contents in both soils before and after planting were more or less the same while other elements decreased after planting. This indicates that the addition of N+P helped maintaining their levels in the soil
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