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Yield and Growth Response of Cuphea to Sowing Date

^a USDA-ARS, North Central Soil Conservation Research Laboratory, Morris, MN 56267, USA
^b USDA-ARS, National Center for Agricultural Utilization Research, Peoria, IL 61604

View larger version (21K): [in a new window]   Fig. 1. Response of Cuphea seed and seed oil yield to planting date in 1999 and 2000. Within each year, mean values followed by the same letter are not significantly different at the P = 0.1 level.

View larger version (35K): [in a new window]   Fig. 2. Plant populations determined at harvest in 1999 and 2000. Within each year, mean values followed by the same letter are not significantly different at the P = 0.1 level.

View larger version (25K): [in a new window]   Fig. 3. Soil temperatures at the 0.05 m depth from April through June in 1999 and 2000.

View larger version (19K): [in a new window]   Fig. 4. (A) Height of Cuphea plants in 1999 as a function of growing degree days (°C d) accumulated from the time of emergence; values are the mean SD, n = 3. (B) Rate of height increase as a function of days after emergence. Regression lines are shown in B for data during linear growth phase; regression equations followed by a different letter are significantly different at the P < 0.05 level.