Residual effects of potassium placement and tillage systems for corn on subsequent no-till soybean
2002
Yin, X. | Vyn, T.J.
Little is known about K fertility management for no-till (NT) soybean [Glycine max (L.) Merr.]. This study was conducted to evaluate the residual effects of K application rate, timing, and placement for corn (Zea mays L.) in various tillage systems on subsequent NT soybean. Field experiments involving a corn-soybean rotation were conducted from 1998 to 2000 on long-term NT fields with medium or high exchangeable soil K levels near Kirkton and Belmont, ON, Canada. In the corn year, treatments included the combinations of three fall K rates (0, 42, and 84 kg ha(-1)), spring K rates (two rates differing by 42 kg ha(-1)), and three tillage systems [NT, zone till (ZT), and moldboard plow (CT)]. Both CT and ZT (also known as intermittent tillage systems) reduced soil K stratification relative to continuous NT. Trifoliate leaf K concentrations increased with residual fall and spring K applications in most site-years. Average soybean yield significantly increased by 8.3% with the application of 84 kg K ha(-1) in fall plus 42 to 50 kg K ha(-1) in spring to previous corn only on medium-testing (K < 100 mg L(-1)) soils. Residual tillage had no effects on leaf K or yield of NT soybean. Application of fall and spring K fertilizers to corn was equally beneficial for subsequent soybean in either continuous or intermittent NT systems. Furthermore, soil K stratification and the residual effects of tillage and K placement method were not major production issues for narrow-row NT soybean in these growing seasons.
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