Page Banner

United States Department of Agriculture

Agricultural Research Service

Title: Relating Soil Test P to Runoff P Losses in Calcareous and Non-Calcareous Soil

Authors
item Torbert, Henry
item Daniel, T - UNIV OF ARKANSAS

Submitted to: American Society of Agronomy Branch Meeting
Publication Type: Abstract Only
Publication Acceptance Date: January 29, 2001
Publication Date: October 19, 2001
Citation: Torbert, H.A., Daniel, T.C. Relating soil test P to runoff P losses in calcareous and non-calcareous soil. 2001 Southern Branch of American Society of Agronomy Abstracts. 2001. No. 28. p. 9.

Technical Abstract: A study was initiated to investigate the relationship between soil test P (STP) and depth of sampling with P losses in runoff. Four soil types were chosen, two calcareous soils and two non-calcareous soils. Soil and runoff samples were collected from each of the four soils in permanent pasture exhibiting a wide range of P levels due to prior manure applications. Soil sampling depths consisted of 0-2.5, 0-5, and 0-15 cm. The STP was determined by Mehlich III and distilled water extraction techniques. Simulated rain was used to produce runoff which was collected for 30 min. Good relationships were derived between STP and runoff losses of P for all four soil types, as indicated by relatively high r**2 values. Differences were observed for the depth of sampling, with the most consistent results observed with the 0-5 cm sampling depth. The relationship between the level of P in the soil and runoff P losses were shown to be reduced in calcareous soils compared to non-calcareous soils.

Last Modified: 4/18/2014