Recent research shows that under good conditions, daily yield losses for soybeans are 0.3, 0.4, and 0.5 percent per day of planting delay for the first, second and third 10-day periods in May. Total yield loss potential mounts to roughly 15 percent by the end of the month.
Intense rainfall followed by warm and windy conditions tends to rapidly dry the surface of soils causing, in some cases, severe soil
crusting. When those conditions precede crop emergence, stand establishment can become compromised.
Uneven emergence, skips, doubles, and uneven spacing all reduce corn yield potential. The later a plant emerges relative to the plants next to it, the less that plant will contribute to overall yield. Those plants tend to stay behind throughout the season.
Stressed plants are more prone to postemergence herbicide injury. Carefully read and follow product labels when selecting spray additives to include with postemergence herbicides.
They are hard to diagnose. Seedling disease symptoms may be caused by multiple factors including the presence of more than one disease, insect feeding, herbicide damage, planting problems, the weather and environment in which they are planted.
Many growers are experiencing conditions ripe for slug damage.
Black cutworms feed on newly emerged and young corn plants, causing damage, stress, and the clipping of seedlings. Carefully monitor fields for black cutworm activity.
Brown stink bugs feed on rolled leaves making several aligned holes appear in a row. If the growing point is pierced, plants tend to create tillers, diminishing its value to the crop as it competes for nutrients.
Daily temperature accumulation determines how fast or slow a corn plant grows and when it reaches maturity.
Controlling weeds is a contributing factor to maximizing yields. Post-emergence herbicide applications play an important role in managing weed populations before weeds and crops exceed specific stages. It is critical that growers always read and follow label instructions.
Meet your corn crop’s demand for nitrogen (N) when it needs it and with the right amounts and forms. Corn response to N fertilization improves when exposure to wet conditions is minimized.
Early weed control is critical to maximizing yield potential. Weed competition costs yield and research proves just how much.
Soybean stand establishment can sometimes be an easy thing, and yet there are always instances where it may take a heroic effort. Spring of 2019 could be looking for some heroes.
Last fall’s wet harvest conditions exposed the soybean seed crop to two key diseases. Phomopsis seed decay (diaporthe longicolla) attacks soybean seeds that are shriveled or have a cracked seed coat, often appearing as a chalky white covering on the seed.
Herbicide resistance continues to become an ever more challenging aspect of crop production. Currently, fifteen weed species in North America are confirmed glyphosate resistant.
Once alfalfa plants have 3-4 inches of new growth, stand health may be assessed by randomly selecting sites throughout the field. You want to see a minimum of 4-5 alfalfa plants per foot.
Early weed competition in soybeans can reduce yields where glyphosate is not applied early.
That’s the answer to how long it takes for corn to emerge; in other words, it depends.
When weather conditions turn cold and wet, young corn plants can become stressed. That impacts their ability to take up nutrients.