Field Maturity, When Should Field Operations Start?

InsightIndustryHarvest
Written By Hailey Clark

Field operations during harvest season should start when crops have reached their appropriate stage of maturity and the field conditions are suitable for equipment traffic. Physiological maturity is an important indicator, but is not always the point at which harvesting should begin. Weather conditions, crop moisture, soil moisture, and the intended harvest method should also be considered before beginning the busy season. Starting too early can cause immature grain, excessive losses, or higher drying costs. While waiting too long can increase the risk of shattering, lodging, disease, or weather damage.

Soybeans

Soybeans are generally ready to begin harvest when approximately 95% of the pods have reached their maturity color, commonly referred to as the R8 growth stage. At this point, the plant has reached physiological maturity, and the leaves will continue to dry down and drop.

Harvest operations should generally begin once soybean seed moisture is appropriate for the harvesting equipment and storage plan. Waiting for excessive dry-down can increase the risk of pod shattering and seed loss, particularly during hot, dry weather.

Soil conditions are also important before beginning field operations. When preharvest or preplant field operations require equipment traffic, soils should be below field capacity and firm enough to support equipment on saturated soils can cause severe soil compaction, which may reduce water infiltration, restrict root regrowth, and create problems for future crops.

Corn

Corn reaches physiological maturity when a black layer forms at the base of the kernel. The black layer indicates that the kernel has reached its maximum dry weight and that additional movement of nutrients into the kernel has essentially stopped.

Although corn can be harvested after physiological maturity, producers should consider grain moisture when deciding when to begin harvest. Corn is often harvested at approximately 25-35% moisture, depending on weather conditions, available drying capacity, storage plans, and the risk of field losses.

Harvesting corn at higher moisture levels can require additional artificial drying, increasing energy and handling costs. However, waiting too long for corn to dry naturally in the field can increase the risk of stalk lodging, ear drop, wildlife damage, and losses from adverse weather. The best harvest timing balances grain moisture with the risk of leaving the crop in the field.

Small Grains

Small grains such as wheat, oats, and barely should be monitored closely as they progress toward physiological maturity and harvest readiness. Important indicators include kernel development, kernel moisture, and the color and condition of the peduncle-the portion of the steam immediately below the grain head.

As the crop approaches maturity, the grain progresses through the hard dough stage. At this stage, the kernel has lost much of its soft, dough-like consistency and is becoming firm. A simple field test is to press the kernel with a thumbnail. At the hard dough stage, the kernel should resist the thumbnail, leaving little or no indention.

For some small grains, swathing or pre-harvest treatments may begin when the crop has reached the appropriate maturity and moisture conditions. Grain moisture is an important consideration because harvesting too early can result in immature grain and higher drying costs. While delaying too long can increase the risk of shattering, lodging, sprouting, or weather-related damage.

For direct combining, grain is typically harvested at a moisture level that allows the combine to thresh and clean the grain effectively. Grain moisture may be around 18-20% when artificial drying is available. If the grain is intended for direct storage without additional drying, it generally needs to be dried to approximately 13.5-14% moisture, depending on the crop and storage conditions.

Guidelines For Beginning Harvest

Before entering the field, producers should evaluate several factors rather than relaying on crop maturity alone:

  • Crop Maturity: The crop should have reached the appropriate physiological or harvest maturity stage.

  • Grain Moisture: Moisture should be suitable for the intended harvest, drying, and storage system.

  • Weather Forecast: Upcoming rain, frost, heat, or prolonged wet conditions can influence whether harvesting should begin sooner.

  • Equipment and Storage Capacity: Harvest should be coordinated with combine capacity, grain handling, drying, and available storage

  • Field losses: Delaying harvest can increase shattering, lodging, and ear drop

  • Crop Quality: Harvest timing can affect test weight, germination, disease development, and overall grain quality

For more information about when field operations should begin check out:

What field observations have you made before starting field operations that weren’t listed in this post? Share your experience in the comments.

Hailey Clark

Hailey Clark is the social media master. A passionate and advocating individual when it comes to agriculture, she works hard in helping you achieve your finished goal.

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