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Irrigation and Nitrogen Effects on Tall Wheatgrass Yield in the Southern High Plains

^a Agric. Sci. Cent. at Tucumcari, New Mexico State Univ., 6502 Quay Rd. AM.5, Tucumcari, NM 88401
^b Dep. of Anim. and Range Sci., Box 30003 MSC 3-I, New Mexico State Univ., Las Cruces, NM 88003

View larger version (15K): [in a new window]   Fig. 1. Seasonal distribution of furrow-irrigated tall wheatgrass dry matter (DM) yields during 3 yr at Tucumcari, NM. Bars indicate the LSD (P < 0.05) for within harvest-date comparisons. Data are averages of irrigation treatments and N rates.

View larger version (16K): [in a new window]   Fig. 2. Effect of winter irrigation regime on the seasonal distribution of furrow-irrigated tall wheatgrass dry matter (DM) yields at Tucumcari, NM, from 1997 to 1999. Bars indicate the LSD (P < 0.05) for within harvest-date comparisons. Absence of an LSD on a date indicates no significant difference among treatments. Data are averages of N rates and years.

View larger version (29K): [in a new window]   Fig. 3. Nitrogen rate effects on the seasonal distribution of furrow-irrigated tall wheatgrass yield in each of 3 yr at Tucumcari, NM. Bars indicate the LSD (P < 0.05) for within harvest-date comparisons. Absence of an LSD on a date indicates no significant difference among treatments. Data are averages of irrigation treatments.