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SORPTION OF ORGANIC PHOSPHORUS COMPOUNDS IN ATLANTIC COASTAL PLAIN SOILS Organic phosphorus (P) can comprise a significant amount of the total P in animal wastes, yet there is little information on the potential for organic P to be transferred from soils to watercourses. We examined the adsorption of organic P compounds to soils typical of the Southeastern U.S., i.e. Bl...
DETERMINATION OF PHOSPHORUS SOURCE COEFFICIENTS FOR ORGANIC PHOSPHORUS SOURCES: LABORATORY STUDIES Phosphorus (P) losses in runoff from application of manures and biosolids to agricultural land are implicated in the degradation of water quality in the Chesapeake and Delaware Inland Bays. We conducted an incubation study to determine the relative P solubility and bioavailabity, referred to as P s...
PHOSPHORUS AVAILABILITY TO BARLEY FROM MANURES AND FERTILIZERS ON A CALCAREOUS SOIL Phosphorus (P) is a limiting soil nutrient for many crops; however, P losses in runoff from agricultural lands are implicated in the degradation of water quality in many regions. We conducted a growth chamber study to determine the relative P solubility and plant P availability of manure and fertil...
LINKING MANURE PROPERTIES TO SOIL PHOSPHORUS SOLUBILITY: IMPORTANCE OF THE CARBON TO PHOSPHORUS RATIO Land application of manure can increase P transfer in runoff, although the risk depends in part on the characteristics of the manure. We assessed this for calcareous soils using swine manures with a range of total P (6.8'4.9 g P per kg), water-soluble P (4.3'8.0 g P per kg), and C:P ratios (31'67)....
CHANGES IN SOIL TEST PHOSPHORUS FROM BROILER LITTER ADDITIONS. Nutrient surpluses on the Delmarva Peninsula have lead to a continual accumulation of soil test P (STP), a potential source for transport of P to surface waters. This paper examines the effects of initial soil test P concentrations and broiler litter additions on STP accumulation. Broiler litter wa...
THE NATURE OF PHOSPHORUS IN CALCAREOUS SOILS Calcareous soils (containing free lime) are common in many arid and semi-arid regions of North America and occur as inclusions in more humid regions. Phosphorus (P) is very reactive with lime. Following fertilizer application, P undergoes a series of reactions that gradually reduce its solubility....
FECAL PHOSPHORUS EXCRETION FROM BROILER CHICKS FED DIETS CONTAINING LOW-PHYTATE BARLEY Low phytic acid grains in poultry diets can reduce P concentrations in feces, but the influence on feces P composition is relatively unknown. We analyzed feces from poultry fed one of four barley based diets. The barley varieties used to generate the diets consisted of wild-type barley (Copeland, ...
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