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Potassium utilization by no-till full-season and double-crop soybean

Potassium utilization by no-till full-season and double-crop soybean

Agronomy Journal 83(1): 190-194

Although K accumulation by soybean [Glycine max (L.) Merr.] his been studied extensively, data on differential K utilization by full-season and double-crop soybean are not available. Potassium utilization by no-till soybean grown at two levels of soil K fertility and two row widths was evaluated under full-season and double-crop planting dates. Plant component dry weight and K concentration were determined at growth stages R1, R5, and R7. For both planting dates, high soil K fertility resulted in elevated tissue K concentration and K accumulation in all plant parts at all three growth stages. At R1, double-crop soybean tissue K concentrations were greater than that of full-season soybean. At R7, double-crop soybean leaf and abscised tissue K concentrations were lower than those of full-season soybean, suggesting a disproportionately greater translocation of K out of the double-crop soybean leaf during seed-fill. At R7, seed K accounted for 64 and 38% of total plant K for low and high K fertility regimes, respectively. Seed K at R7 was a constant proportion of total K accumulated for both fall-season and double-crop planting dates. Row spacing did not alter shoot K concentration or accumulation for either planting date. Potassium accumulation rate was greatest between R1 ad R5, was increased by high K fertility conditions, and was not different between full-season and double-crop planting dates except during the seed-filling period when the full-season soybean K uptake rare was greater. Full-season soybean maintained a greater soil K uptake rate daring seed-fill while double-crop soybean seed K supply was apparently more dependent on redistribution of K from other plant tissues.

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Accession: 002190147

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DOI: 10.2134/agronj1991.00021962008300010045x

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