About Us | Help Videos | Contact Us | Subscriptions

Soil Science Society of America Journal Abstract -

Vertical Distribution in Soil of Unincorporated Surface-applied Phosphorus Under Sprinkler Irrigation


This article in SSSAJ

  1. Vol. 52 No. 6, p. 1685-1692
    Received: Dec 7, 1987

    * Corresponding author(s):
Request Permissions

  1. D. A. Lauer 
  1. USDA-ARS, P.O. Box 30, Prosser, WA 99350



Determining vertical distribution of P is important in irrigated conservation cropping systems for evaluation of P fertilization because soil-immobile phosphorus accumulates near the soil surface where limited tillage reduces soil mixing. The objective was to determine in field and laboratory experiments the vertical distribution of P from surface-applied monoammonium phosphate (MAP; 227 g P kg−1), triple superphosphate (TSP; 197 g P kg−1), and ammonium polyphosphate (APP; 149 g P kg−1). Following P application, vertical distribution was determined from 2-cm depth increment samples in a Quincy sand (mixed, mesic, Xeric Torripsamments), a Warden silt loam (coarse-silty, mixed, mesic, Xerollic Camborthids), and a calcareous subsoil of the Warden. There was little effect on P distribution from antecedent moisture; fertilizer rates at 30, 60, 120, or 240 kg P ha−1; or from preirrigation reaction times of 1, 4, or 16 d. Continuous postapplication irrigation totals of 40 or 160 mm at 10 mm d−1 moved P somewhat deeper into the soil, principally at 160 mm on the Quincy sand. Overall mean penetration depths of P were as follows: (i) APP moved the farthest in the Quincy sand (mean = 6.1; SD = 1.05 cm); (ii) penetrations were practically the same for MAP or TSP on the Quincy sand (mean = 5.4; SD = 1.32 cm) and on the noncalcareous Warden silt loam (mean = 5.5; SD = 1.25 cm); (iii) depth of penetration was intermediate for APP on the noncalcareous Warden (mean = 4.0; SD = 0.98 cm); and (iv) downward movement in the calcareous Warden of P from all fertilizer P materials was much more restricted (MAP/TSP: mean = 3.1; SD = 0.10 cm and APP: mean = 3.3; SD = 0.52) than on the two noncalcareous soils. Overall, the most apparent conclusion from this study is that the reactivity of P fertilizer material with the soil is the dominant and overriding determinate of the vertical distribution of surface-applied P.

Contribution from USDA-ARS in cooperation with the College of Agriculture and Home Economics Res. Ctr., Washington State Univ., Pullman, WA. Scientific Paper no. 7918 of the latter.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America