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Red Clover Seed Production

VI. Effect and Economics of Soil pH Adjusted by Lime Application

National Forage Seed Production Research Center, USDA-Agricultural Research Service, 3450 SW Campus Way, Corvallis, OR 97331

View larger version (41K): [in a new window]   Fig. 1. Monthly precipitation and average temperature from 1993 to 1995 for 2 yr of red clover seed production near Corvallis, OR.

View larger version (32K): [in a new window]   Fig. 2. Effect of normal and delayed herbage removal on the relationship between season-end dry matter production from the time of spring herbage removal until seed harvest and red clover seed yield. Points represent three lime treatments and four replications.

View larger version (24K): [in a new window]   Fig. 3. Effect of soil pH, time of spring herbage removal, and age of stand on seed yield of red clover grown near Corvallis, OR in 1994 and 1995.

View larger version (15K): [in a new window]   Fig. 4. Effect of soil pH on red clover root health in 1995 after 2 yr of seed production near Corvallis, OR. Root borer means are presented with 5% confidence.

View larger version (31K): [in a new window]   Fig. 5. Effect of lime application amount on partial budget net income for red clover seed production near Corvallis, OR, shown as: (A) combined 2 yr of production; (B) first and second seed production years; and (C) herbage removal time. Results are based on a seed price of $1.65 kg-1. Lime and application costs were amortized across the two production years. Graph bars with different letters are significant at P 0.05 by Fisher's protected LSD test.