Individual study: Late autumn vs. spring seeding in the establishment of crested wheatgrass Agropyron desertorum on degraded steppe in Zarand Saveh region, northern Iran
Moghaddam M.R. (1976) Late fall vs spring seeding in the establishment of crested wheatgrass in the Zarand Saveh region of Iran. Journal of Range Management, 29, 57-59
Due to long-term livestock overgrazing, native arid steppe (prevalent species including whitewormwood Artemisia herba-alba, the chenopod Salsola rigida and feather grass Stipa barbata) in the Zarand Saveh region of northern Iran is severely degraded. Attempts were made to improve vegetation condition by sowing with crested wheatgrass Agropyron desertorum (native to the region). Success of early spring and late autumn seeding were compared.
A seriously deteriorated homogenous area was selected. Seedbed preparation comprised ploughing, discing and rolling. Seed was drill-seeded at 2.54 cm depth (row spacing 50 cm) at a rate of 5.75 kg/ha. Autumn sowing was undertaken 17 November 1972, and in early spring on 24 March 1973.
Best wheatgrass emergence and establishment was obtained from autumn seeding. There was higher seedling emergence (37.5 seedlings/m² vs. 31.1/m²) and a greater density of (more vigorous) plants in both summers (1973: 27.8 vs. 13.1; 1974: 25.2 vs. 10.9).