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Birdsfoot Trefoil Seed Production

III. Seed Shatter and Optimal Harvest Time

^a Instituto Nacional de Investigaciones Forestales y Agropecuarias, CE Pabellon, Carretera Ags.-Zac. km. 32.5, Apdo. Postal 20, Pabellon de Arteaga, Ags. C.P. 20660, Mexico
^b National Forage Seed Production Research Center, USDA-ARS, 3450 SW Campus Way, Corvallis, OR 97331 USA

View larger version (30K): [in a new window]   Fig. 1 Percentage of the total shattered seeds relative to seeds lost at harvest time of birdsfoot trefoil for six irrigation treatments in 1994 and 1995, and two treatments in 1996. Symbols indicate: D30–F50 see hard copy, D30–F100 see hard copy, D60–F50 see hard copy, D60–F100 see hard copy, LS see hard copy, C see hard copy. The six treatments were: D30–F50, single water replacement to 50% FC when soil-water depletion was 30% of available water; D30–F100, single water replacement to 100% FC when soil-water depletion was 30% available water; D60–F50, single water replacement to 50% FC when soil-water depletion was 60%; D60–F100, single water replacement to 100% FC when soil-water depletion was 60% available water; LS, low-stress, the soil-water content was maintained close to 100% field capacity (FC) during the period from early-June until 3 wk before seed harvest by two or to three water application replacements per week based on neutron attenuation soil-water content measurements; and C, a non-irrigated control. Dashed vertical lines indicate the times of peak shattering events. Vertical bars indicate the average standard error of the mean for the treatments

View larger version (31K): [in a new window]   Fig. 2 Variation in average temperature, relative humidity, and water vapor pressure deficit in 1994, 1995, and 1996. Dashed vertical lines indicate times of peak shattering events based on the results presented in Fig. 1

View larger version (33K): [in a new window]   Fig. 3 Shattered seeds (see hard copy), shattered pods (%) (see hard copy), and seed losses before (solid vertical bars) and after (hatched vertical bars) harvest time as a percentage of actual harvested seeds from low stressed (LS) and non-irrigated (C) birdsfoot trefoil irrigation treatments in 1994, 1995, and 1996. The treatments were as described in Fig. 1. Harvest time was when the color of most pods were light-tan to brown and seed shattering had begun. Vertical bars indicate the average standard error of the mean for each seed shatter component