TEST Soybean Yield Response to Planting Population

Trial Overview

  • In the past, high seeding rates were10;recommended as a weed management tool in soybean cropping systems. High10;populations allow more rapid canopy closure, which reduces light availability for10;competing weeds. As weed management has improved, reliance on this strategy has10;declined, and population management has become an agronomic tool for optimizing10;yield potential.
  • Though10;soybeans compensate for different plant populations, seeding rates that are too10;high lead to tall, slender plants that are prone to lodging. Besides the10;potential effect on yield, lodging decreases crop harvestability and compromises10;seed quality. Soybean products respond differently to plant populations and in their10;susceptibility to lodging.

Research Objective

10;Location 10;
10;Soil Type 10;
10;Previous Crop 10;
10;Tillage Type 10;
10;Planting Date 10;
10;Harvest Date 10;
10;Potential Yield 10;
10;Planting Rate 10;
Huxley, IA

10; Site Notes:10;

14 Asgrow brand soybean products with maturity groups (MG) ranging from 1.7 to 3.2 MG were planted at three different10;seeding rates: 100,000 seeds/acre (100K), 150,000 seeds/acre (150K), and10;200,000 seeds/acre (200K).

Understanding the Results

Figure X. Image Caption
  • In10;this trial, the highest planting population of 200K seeds/acre performed10;slightly better than the lower populations for the early MG soybean products.10;For the later MG soybean products, the lowest planting population of 100K10;seeds/acre performed better.
  • On10;average, the early MG soybean products performed better than the later MG10;products in this trial.

What Does This Mean for Your Farm

  • Yield is influenced by many factors including10;management practices, genetic response to the environment, climate, fertility,10;and pests and diseases, among others.
  • Product response to variable seeding rates can10;affect year-end results.