Seeding rates and planting dates for onion set production with short, intermediate and long day cultivars

Abstract

A field experiment was conducted on the experimental farm of the University of California at Davis to determine the effect of three planting dates and four seeding rates on the production of on of three commonly grown cultivars (Allium cepa L „). This experiment was part of a project to determine optimum planting date and plant population. The cultivars were: Texas Grano, an early short - day cultivar; California Red, asemi early intermediate - day cultivar; and Sweet Spanish, a late long - day cultivar. They were planted on March 5, March 23, and on April 12„ For each planting date the f o l l o w i n g seeding rates were used; 19, 31, 43 and 56 kg/ha. The first planting date, however, was not included in the statistical analysis, due to its low plant population.