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Abstract
Phosphorus uptake rate, plant top weight, and grain yield were measured for corn (Zea mays L.) planted in field plots with or without fumigation, with different levels of P fertilization, and under conventional till and no till management. Plant growth and grain yield in P‐deficient, unfumigated conventional till and no till plots were significantly higher than those in the corresponding fumigated plots. The heightened responses were attributed to enhancement of P uptake by biological activity. Therefore, the effect of differential microblal activity on P uptake must be considered in estimating the lowest level of P fertilization needed for adequate growth in low P soils.
Notes
Contribution No. 7874 and Scientific Article No. A‐4847 of the Maryland Agricultural Experiment Station, Agronomy Department, University of Maryland, College Park, MD 20742. This work was supported in part by funds provided by the Tennessee Valley Authority, Delmarva Poultry Industry, Agway, Inc., and Chevron Chemical Company.
Soil Scientist, ARS, USDA, Beltsville, MD; Professor, University of Maryland; Microbiologist, ARS, USDA, Beltsville, MD; formerly Plant Physiologist, ARS, USDA, Beltsville, MD.