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Alfalfa (Medicago sativa L.) growers in semiarid subtropical regions seek forage crops having a lower irrigation requirement. Perennial forage kochia (Bassia prostrata (L) A.J. Scott (syn. Kochia prostrata)) can potentially fill this need. The New Mexico State University’s Agricultural Science Center at Tucumcari evaluated four genotypes of B. prostrata (subspecies virescens ”Immigrant” and “Pustinny-select” and subsp. grisea “Snowstorm” and “KZ-6X”) that were direct-seeded in March and May of 2014 under irrigation in semiarid continental precipitation conditions, in three randomized complete blocks. Canopy cover was rated in 2016 and 2018 and biomass production was measured in 2018. Snowstorm did not establish on either date. Canopy cover remained unchanged across years. Immigrant established the greatest canopy cover for the March seeding and Pustinny-select had greater canopy cover for the May seeding. The May seeding tended (p &lt; 0.10) to have greater biomass production than the March seeding (12,357 and 8909 kg ha−1, respectively, SEM = 2454). Irrigation or adequate precipitation to maintain soil moisture and weed control are critical to B. prostrata establishment by direct seeding, especially in dry winter regions. Further research is necessary to determine the potential of this species as an alternative to alfalfa in semiarid, subtropical, and continental precipitation regions.

Genotype and Planting Date Influence on Establishment and Growth of Bassia prostrata (L) A.J. Scott in a Semiarid Subtropical Dry Winter Region