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

Soybean Growth Staging Guide

Click box to view image of each growth stage
Click to view details and image of each growth stage

Avg. Days After Planting Growth Stage Description
V-E Emergence
Cotyledons have been pulled through the soil
V-C Unifoliate
First unrolled unifoliate leaf (single leaflets)
V-1 Trifoliate
First unrolled trifoliate leaf (three leaflets)
V-2 to V-4 Trifoliate
Second unrolled trifoliate, third unrolled trifoliate leaf, fourth etc.
R-1 Early Flower
Plants have at least one open flower at any node (point where leaf attaches to the stem)
R-2 Full Flower
Plants have an open flower at one of the two uppermost nodes on the main stem
R-3 Early Pod
Pods are 1/4-inch long at one of the four uppermost nodes on the main stem
R-4 Full Pod
Pods are 3/4-inch long at one of the four uppermost nodes on the main stem
R-5 Early Seed
Seeds are 1/8-inch long at one of the four uppermost nodes on the main stem
R-6 Full Seed
Pods contain green seeds that fill the pod to capacity at one of the four uppermost nodes on the main stem
R-7 Early Maturity
Majority of pods are yellow and at least one pod on the main stem has reached its mature colour (tan/brown)
R-8 Full Maturity
95% of pods have reached their mature colour (tan)
Harvest can begin when seed moisture is approx. 14%

Plant Population

High: (>160,000 plants/ac)

This is generally beyond the optimum plant stand for soybeans - disease presure may be increased.

Good: (120-160,000 plants/ac)

Plant stands between 120,000 and 160,000 plants/ac are estimated to produce 95 to 100% of optimum yield.

Adequate: (80-120,000 plants/ac)

Risk of yield loss due to low plant population - plant stands between 80,000 and 120,000 plants/ac are estimated to produce 84 to 95% of optimum yield.

Low: (< 80,000 plants/ac)

High risk of yield loss due to low plant population - attention to weed control will be important and low pod height may be a problem at harvest.

Plant population and yield information is based on final research results from Mohr et al. 2014. The effect of actual plant stand on relative yield of soybean was determined based on13 site years of data in Manitoba from 2011-2013.

Average number of days from planting observed in Manitoba. This can fluctuate by 5-10 days depending on region and variety.