Influence of Date of Planting on Emergence of Cultivars of Trifolium hirtum All. and Triflium subterraneum L.

Emergence by seven cultivars of rose clover (Trifolium hirtum All.) and eight cultivars of subclover (T. subterraneum L.) was studied in relation to date of planting in a plant community on cismontane California annual range. Numerous dates of planting were used in each of three growing seasons, from 2 months before to 2 months after the first rain in the fall. The temperature in the seedbed was monitored hourly from the first planting date through clover emergence. The seeded clovers, including seeds of all previous plantings, germinated at the time of the first effective rains. Where seeds were exposed to high soil temperatures (30-50°C), early fall planting generally reduced seedling emergence in cultivars of rose clover, but enhanced or did not affect emergence in subclover. In 2 of the 3 years, seeding after the first rain gave significantly lower emergence. Maximum seedbed temperatures below 10°C allowed only very limited emergence.This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries.The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.Migrated from OJS platform August 202