Rotations of Soybean with Two Tropical Legumes for the Management of Nematode Problems
Authors
R. Rodriguez-Kabana
D. B. Weaver
D. G. Robertson
R. W. Young
E. L. Carden
Keywords:
Aeschynomene americana, American Jointvetch, Cropping Systems, Cultural Practices, Cyst Nematode, Hairy Indigo, Heterodera glycines, Indigofera hirsuta, Integrated Pest Management, Meloidogyne arenaria, Root-Knot Nematode, Rotations, Soybean, Tropical Legumes
Abstract
The effects of two tropical legumes, American jointvetch (Aeschynomene americana) and hairy indigo (Indigofera hirsuta), in rotations with soybean (Glycine max) on populations of root-knot (Meloidogyne arenaria) and cyst (Heterodera glycines) nematodes and on soybean yields were studied in a 2-year field experiment. End-of-season juvenile soil populations of M. arenaria and of H. glycines were reduced by 95-100% where either of the tropical legumes was grown. Yields of seven soybean cultivars (Braxton, Centennial, Gordon, Kirby, LeFlore, Ransom, Stonewall) increased significantly in plots planted with jointvetch or indigo the previous year. The magnitude of the yield increment depended on the soybean cultivar; the average increases in yields for all cultivars were 46% and 55% following jointvetch and indigo, respectively. At-plant application of aldicarb (17 g a.i./100 m of row in a 20-cm-wide band) was most effective in increasing yields of soybean grown in monoculture but was gener
