Sweet corn plant responses to P and K in the soil and to band-applied monoammonium phosphate, potassium sulfate, and magnesium sulfate
1989
Peck, N.H. | MacDonald, G.E.
Responses of sweet corn plants (Zea mays L. var. rugosa cv. Jubilee) to levels of residual P and K in a fine sandy loam soil from previous broadcast applications of concentrated superphosphate (CSP) and potassium chloride (KCl) and to band-applied monoammonium phosphate (MAP), potassium sulfate (K2SO4), and magnesium sulfate (MgSO4) at planting were studied. Fourteen years after no applications of broadcast CSP or KCl fertilizers, responses of sweet corn plants to levels of residual P were greater than to residual K in the soil. Increasing the level of residual P in the soil increased dry weight per seedling from 1.5 to 7.7 g, fresh weight per ear from 278 to 358 g, the concentration of P from 2.9 to 4.6 mg.g-1 dry weight, but decreased K, Ca, and Zn in the leaves. Increasing the level of residual K in the soil did not affect the dry weight of the seedlings or the fresh weight of the ears, but increased the concentration of K from 16.7 to 28.1 mg.g-1 dry weight and decreased Ca and Mg in the leaves. Banded MAP, especially at low levels of residual P in the soil, increased the dry weight of the seedlings and the fresh weight of the ears. Banded K2SO4 did not affect the weight of the seedlings or ears, but increased the concentration of K and decreased Ca and, especially, Mg in the leaves. Banded MGSO4, with or without high residual K in the soil and/or banded K2SO4, did not affect weight of the seedlings or ears, but decreased the concentration of K and increased Mg in the leaves of the sweet corn plants.
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