Estimating the rate of drawdown of legacy P and residual nitrogen from repeated manure application

Project: MLMMI 2015-16


The main objective of the study is to determine the rate of P depletion in soil following 7 years of continuous application of manure to agricultural land and quantify plant available residual nitrogen from manure.


  1. Evaluate the impact of cropping system (annual versus perennial) on P depletion rate;
  2. Determine the effect of nutrient sources on P depletion rate; and
  3. Based on the P depletion rate, develop predictive equations to determine how long it will take to reduce available soil below 60 ppm of Olsen P in agricultural soil under annual and perennial cropping systems.


Dr. Wole Akinremi, University of Manitoba


Status: New
Started: 2016-05-01
Completed: 2019-03-31

Funding Partners: This project received support from the Manitoba Livestock Manure Management Initiative (MLMMI). MLMMI is funded by the Canada and Manitoba governments through Growing Forward 2, a federal-provincial-territorial initiative. MLMMI also receives funds from the Manitoba Pork Council. Growing Forward 2 funding: $35,440 Manitoba Pork Council funding: $35,440

Amount Funded: $70,880.00
Performer Funded: $0.00
Total Cost: $70,880.00


First annual report due Feb 28, 2017
Second annual report due Feb 28, 2018
Final report due Mar 31, 2019.

Manitoba Pork represents 613 Manitoba hog farms