Evaluation location: , United States
Pea germplasm collections (Pea PSP) were planted following augmented design with standard checks (“Hampton,” “Arargorn,” “Columbian,” and “1,022”) at the USDA Central Ferry Farm in 2016, 2017, and 2018 (planting dates were March 14, March 28, and April 03, respectively). The central Ferry farm is located at Central Ferry, WA at 46°39′5.1″N; 117°45′45.4″ W, and elevation of 198 m. The Central Ferry farm has a Chard silt loam soil (coarse-loamy, mixed, superactive, mesic Calcic Haploxerolls) and was irrigated with subsurface drip irrigation at 10 min d−1. All seeds were treated with fungicides; mefenoxam (13.3 ml a.i. 45 kg-1), fludioxonil (2.4 ml a.i. 45 kg -1), and thiabendazole (82.9 ml a.i.45 kg -1), insecticide; thiamethoxam (14.3 ml a.i. 45 kg -1), and sodium molybdate (16 g 45 kg -1) prior to planting. Thirty seeds were planted per plot; each plot was 152 cm long, having double rows with 30 cm center spacing. The dimensions of each plot were 152 × 60 cm. Standard fertilization and cultural practices were used.
The following traits were recorded and are presented in this manuscript. Days to first flowering are the number of days from planting to when 10% of the plot’s plants start flowering. The number of seeds per pod is the number of seeds in each pod. Plant height (cm) is defined as when all plants in a plot obtained full maturity and were measured in centimeters from the collar region at soil level to the plants’ top. Pods per plant is the number of recorded pods per plant. Days to maturity referred to physiological maturity when plots were hand-harvested, mechanically threshed, cleaned with a blower, and weighed. Plot weight (gm) is the weight of each plot in grams after each harvest. Seed yield (kg ha−1) is the plot weight converted to seed yield in kg per hectare.