About the MPSG Bean App

The Manitoba Pulse & Soybean Growers (MPSG) organization represents 3,800 farmers in Manitoba who grow soybeans, edible beans, peas and other pulses. MPSG’s mission is to provide research, production knowledge and market development support to Manitoba pulse and soybean farmers. This app is a production tool that delivers research results and resources directly into the hands of farmers and their agronomists, assisting them with production decisions.

The MPSG Bean App features six interactive tools. The Seeding Rate Calculator can be used to determine the economically optimum seeding rate for soybean. A soybean Plant Stand Assessor walks users through evaluating plant populations after seeding to see if their target plant stand has been reached. A soybean Growth Staging Guide provides a picture and description of each growth stage and can be used to ensure timely management decisions. The soybean Yield Estimator outlines the key parameters that contribute to grain yield, allowing users to estimate yield prior to harvest. The soybean Harvest Loss Assessor guides users in an exercise to quantify harvest losses at the header and behind the combine to identify settings that need adjustment. The White Mould Risk Assessment helps users understand the environment and management decisions affecting white mould development in edible beans.

MPSG does not validate results and takes no responsibility for the accuracy if these results. The MPSG Bean App was developed with assistance from MPSG Production Specialists. Funding for App developments was been provided in part by Growing Forward 2. For more information, visit www.manitobapulse.ca

Seeding Rate Calculator

General recommended seeding rates for soybeans in Manitoba are 190-200,000 seeds/ac for air seeders (based on 70-75% expected seed survival) and 170-180,000 seeds/ac for planters (based on 80-85% expected seed survival). The aim is to establish a live plant stand of 140-160,000 plants/ac. This recommendation can be fine-tuned for individual operations by using this calculator.

Step 1

Identify the economically optimum target plant stand based on the following economics:

Fill In The Following:

Update The Table Below

Step 2

Tap the target plant stand (plants/ac) that provides the highest relative return

Plant Stand
Yield Potential
Relative Return
(Tap to use in Step 3) (% of Optimum) ($/ac)
60,000 - -
80,000 - -
100,000 - -
120,000 - -
130,000 - -
140,000 - -
150,000 - -
160,000 - -
180,000 - -

Step 3

Determine your seeding rate based on expected seed survival.

Fill In The Following:

On-Farm trials in Manitoba have shown an average seed survival of 74% for air seeders on 15 farms (range 45-90%) and 82% for planters on 11 farms (range 60-96%).


Suggested Seeding Rate:
- seeds/ac or - units/ac

To convert the seeding rate to lbs/ac, take 'Seeds/ac' and divide by 'No. of seeds/lb', which can be found on your seed tag label.

Expected Seed Survival

Expected seed survival (or % emergence) is calculated as:

This value is farm and field specific and is influenced by:

Relative Return

The relative return is calculated based on yield potential, relative seed cost and relative income for each plant stand. Relative seed cost and income are compared to the standard practice of establishing a plant stand of 160,000 plants/ac. This plant stand has been found to produce the highest yield and levels above this do not result in increased yield.

Yield Potential

Based on a yield response curve developed from research conducted at 13 site-years across Manitoba from 2011-2013 by Dr. Ramona Mohr at Brandon Research Centre (Agriculture and Agri-Food Canada). Funding provided by Manitoba Pulse & Soybean Growers.

Includes cost of seed, inoculant and seed treatment if applicable. A unit is a bag of 140,000 seeds.