Planting Date, Rate, and Twin-Row vs. Single-Row Soybean in the Mid-South
Comparisons were made of single-row vs. twin-row soybean [Glycine max (L.) Merr.] production on a Beulah fine sandy loam (coarse-loamy, mixed, active, thermic Typic Dystrudepts) (BFSL) and Sharkey clay (very-fine, smectitic, thermic Chromic Epiaquerts) (SC) in 2009 and 2010 at Stoneville, MS. Seeding rates of 20, 30, 40, and 50 seed m−2 were planted on beds in 102 cm single rows or 25 cm twin rows with 102 cm centers. Three planting dates, mid-April and mid-May representing the Early Soybean Production System (ESPS) and mid-June common to double-crop soybean were made. Data included plants at growth stage R4 (full pod), nodes and pods plant−1, yield, seed weight, and seeds m−2. Twin rows yielded more than single rows on both soils (3.8 Mg ha−1 vs. 3.6 Mg ha−1 on BFSL; 4.2 Mg ha−1 vs. 4.0 Mg ha−1 on SC). Yields in 2010 were less than 2009 due to drought and heat stress. Delayed planting across row types decreased yields as much as 40% while increasing seeding rates had no effect. Twin rows produced more plants m−2 than single rows. Differences in nodes plant−1 were noted but did not affect yield. Pods per plant did not differ between row configurations on either soil. Seeding rates above 30 seeds m−2 did not produce greater yields and above 50 seeds m−2 on the BFSL produced seed with less weight. Twin–rows generally produced more seeds per m2 than single rows. Small yield increases and high equipment costs make considering a twin-row planter's usefulness with other crops important before purchasing it for soybean production.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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