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Fluid Journal : Fluid Journal 1999-2001
3 Fluid Journal Fall 2000 surrounding the location of the band. Root growth and development are critical for early P uptake of corn because P is positionally fixed and relatively immobile in many soils. Thus, root absorption of P is dependent on root length, diameter, and surface area in contact with the soil. In our study, starter P placement with the seed probably increased the level of soil P available in the germinating seed, which in turn promoted early root growth. G owi g eason rwngse Growing season Growing season Growing season Statistical analysis revealed that almost all of the dependent variables examined were significantly affected by year. The different corn hybrids used during the study probably contributed to the significant year effects for corn nutrient composition and grain yield. Diverse growing season air temperatures also could have played a major role in causing these year effects (Table 1). The 1993 growing season was characterized by normal air temperatures early, followed by much cooler-than-normal temperatures for the balance of the growing season. The much warmer-than-normal air temperatures seen early in the 1994 growing season were followed by much cooler-than-normal temperatures in July and August. Cooler-than-average temperatures in May 1995 were followed by near-normal temperatures in June and July, and by warmer-than- normal temperatures in August. Dr. Riedell is plant physiologist, USDA/ ARS, Brookings, SD; Dr. Beck is manager of SDSU Dakota Lake Research Station, Pierre, SD; and Dr Schumacher is soil scientist in the Plant Science Department at South Dakota State University.
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