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Alternative Establishment Methods for Wheat Following Soybean 1
Author(s) -
Griffin James L.,
Taylor Richard W.
Publication year - 1986
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1986.00021962007800030019x
Subject(s) - sowing , agronomy , seedbed , seeding , loam , semis , biology , growing season , soil water , ecology
A majority of wheat ( Triticum aestivum L.) planted following soybean [ Glycine max (L.) Merr .] in Louisiana is planted using conventional seedbed preparation. Delayed harvest of soybean due to late maturity or adverse weather may eliminate the option of planting a winter wheat crop. Field studies were conducted in southwest Louisiana on a Crowley silt loam (fine, montmorillonitic, thermic Typic Albaqualf) soil from 1980 to 1984 to compare various seeding methods for wheat following soybean. Planting methods included: (i) conventional seeding, (ii) overseeding at 50% soybean leaf defoliation (early overseeding), (iii) overseeding presoybean harvest, (iv) overseeding post‐soybean harvest, and (v) no‐till seeding in soybean residue. Wheat overseeded early was planted 16, 27, and 23 days prior to the other treatments in 1980, 1981, and 1983, respectively. Averaged over years, percent ground cover at approximately 100 days after early planting and at maturity was highest where wheat was overseeded early and lowest where it was seeded conventionally. Early season plant height averaged over years for wheat overseeded early was 21% greater than wheat overseeded preharvest, postharvest, and no‐till, and 47% greater than wheat seeded conventionally. Plant height at maturity was similar for all seeding methods. Yield obtained from wheat overseeded early was 14% higher than yields of the other treatments. Wheat yield was similar where wheat was seeded conventionally and no‐till. Differences in yield among the treatments were not reflected in wheat spike density or 500‐seed weight. Overseeding wheat in standing soybean and no‐till planting in soybean residue are viable alternative planting methods compared with conventional seedbed preparation. The earlier planting would allow wheat to establish more rapidly in the fall. Both overseeding and no‐till planting would be advantageous in a wet fall or where potential soil erosion would prohibit seedbed preparation.