Papers
Effect of long-term fertilization and placement of phosphorus on barley yields
Karamanos, R. E. and Kruger, G. A. 2009. Communications in Soil Science and Plant Analysis. 40: 538-554.
Request A Paper
If you would like a copy of this paper, we can send it directly to your inbox! Just fill out the form below.
Abstract
An experiment that was established in 1982 to assess placement of phosphorus (P) fertilizer on the yield of continuous barley was terminated in 2004, after annual application of P (30 kg ha-1) was discontinued in all but one treatment in 2002. Total removal of P during the first 20 years of the experiment (615 kg P2O5 ha-1) was virtually equal to total P application (600 kg P2O5 ha-1); however, when removal by the control that was fertilized with N only was subtracted from the total removal, a residual P component of 474 kg P2O5 ha-1 was obtained as a result. In spite of this, discontinuing P fertilization after 20 years resulted in significant reduction in barley grain yield that was greater in the treatments where P was seedrow placed (21%) than where P was either banded (12%) or one third seedrow placed and two thirds banded (15%). Four-week burial of anion PRS TM probes in 2006 allowed us to ascertain the reasons for these differences that reflected management and P placement practices. The use of PRS probes allowed us to interpret more than 90% of variations both in P removal and yield of barley over the duration of the experiment.
Keywords
Barley, bicarbonate, placement, PRS%u2122 probes, residual P
