IPI International Potash Institute
IPI International Potash Institute

Scientific abstracts

Title:
Double-Crop Soybean Response to Potassium on Mid-Atlantic Coastal Plain and Piedmont Soils
Authors:
Parvej, Md. R., A.S. Williams, D.L. Holshouser, W.H. Frame, and M.S. Reiter
Published in:
Agron. J. 110(1):399-410 (2018), English

Abstract:

Potassium fertilization research on soybean [Glycine max (L.) Merr.] double cropped with winter wheat (Triticum aestivum L.) is lacking. We characterized double-crop soybean response to fertilizer K across 22 Coastal Plain and Piedmont sites with and/or without wheat straw removal during 2013 to 2015. Mehlich-1 soil-K concentrations at 0 to 15 and 0 to 30 cm depths were better in explaining relative yield variability (r2 = 0.80), defining critical soil-K concentrations that ranged from 40 to 75 mg K kg-1 for 0 to 15 cm and 36 to 66 mg K kg-1 for 0 to 30 cm depths, and identifying K-deficient sites (100% accurate) than soil-K concentration at 0 to 60 cm depth (r2 = 0.48; 56% accurate). Critical soil-K concentration at 0 to 30 cm depth did not change with wheat straw management, but slightly increased at 0 to 15 cm depth when straw was removed. The R2 leaf-K concentration with a critical range of 20 to 23 g K kg-1 was better (75% accurate) in diagnosing K deficiency than V5 plant-K concentration (50% accurate) with a critical range of 17 to 23 g K kg-1. Double-crop soybean required 33 to 119% more fertilizer K than Virginia Cooperative Extension recommendations for ≤50 mg soil-K kg-1 at 0 to 15 cm depth, but 6 to 55% less fertilizer K for similar soil K concentration at 0 to 30 cm depth. Wheat straw management should not be an issue of concern for fertilizer-K recommendations based on soil-K concentration at 0 to 30 cm depth for double-crop soybean production on Coastal Plain and Piedmont soils.

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