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Fluid Journal : Fluid Journal 1999-2001
4 Fluid Journal Spring 2001 Timing is also a consideration. Nutrients must be available when plant demand is greatest. Cotton requires N early in the season and significant P and K later. Thus, an application of N as starter should benefit young cotton plants. The demand for nutrients by soybeans occurs later in the season, which suggests that fertilizer should not be banded close to the seed but rather mixed with more of the soil in the rooting volume. Although several interacting factors will affect plant nutrient content, nutrient accumulation during the growing season generally follows a typical growth pattern, with a rapid or exponential increase up to a maximum, followed by a general decline. Regardless of the exact shape of the curve, plants require significant quantities of nutrients during periods of exponential growth. Dr. Kovar is Soil Scientist, USDA/ARS, National Soil Tilth Laboratory, Ames, Iowa
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