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Abstract
Studies were conducted on two Blackland Prairie soils at Dallas, TX to determine the influence of clover plowed under on N nutrition of subsequent crops. Wheat yields were 103 and 86% of the yields obtained with 90 kg N/ha for the first and second crops after clover, respectively. Yields of nonfertilized wheat following fallow were 75 and 72% of the yield obtained with 90 kg N/ha for the first and second crops, respectively. Forage sorghum (non‐fertilized) grown as the first, second and third crop after clover produced 93, 80 and 43%, respectively, of the yields obtained with application of 90 kg N/ha. Nitrogen concentration in whole forage sorghum plants was 2.44 and 1.21% when grown as the first and third crop after clover, respectively. Nitrogen concentration in forage sorghum with N applied was 2.5%. These studies indicate that N from clover plowed under in Blackland soils may preclude N response by the first crop after clover. Some benefit may be obtained by the second crop but little if any influence would be expected on yield of the third crop after clover.