Wet conditions in the spring can create major planting challenges for growers. Flooding and excess moisture in the fields can lead to millions of acres being left unplanted. Unfortunately, this can create favorable conditions for fallow syndrome, a phosphorus deficiency in the soil that can negatively impact next season’s crop.
Growers with fields left fallow can consider making a fall or spring application of EXTRACT PBA to overcome the potential impact of fallow syndrome. EXTRACT helps growers maximize yields by releasing bound nutrients in the soil, making them available to the next crop.
What causes fallow syndrome?
When the soil is left fallow (uncultivated) for an extended period of time, changes in soil biology occur. In particular, a decrease in the population of specific beneficial fungi, called “vesicular arbuscular mycorrhizae” or VAM, is observed. These mycorrhizal fungi help the roots of plants such as corn take up phosphorus and zinc, but they require actively growing roots to survive. The decline of these fungi in unplanted acres causes fallow syndrome, which primarily impacts grass crops like corn and small grains.
In addition to nutrient deficiencies, fallow conditions also impact soil quality due to reduced organic matter content (e.g., carbon and nitrogen) in the absence of crop residue. As a result, soil microbial functions within the soil are adversely affected, leading to reduced denitrification and soil respiration rates.
Corn is the crop that will be the most impacted. Affected corn plants will exhibit symptoms of phosphorus and zinc deficiency, including stunting, purple leaves, and uneven growth.
How can EXTRACT PBA help?
Growers can turn to EXTRACT to overcome phosphorus deficiency in fallow fields and help prevent fallow syndrome. A soil-applied biocatalyst, EXTRACT is designed to improve soil health and effectively increase the release of nutrients from the soil. In fallow soil conditions, EXTRACT can assist by maximizing the availability of bound phosphorus for easier plant uptake.
In a recent study (Fig. 1) conducted in fallow soils in Minnesota, soil treated with EXTRACT showed a >38% increase in plant-available phosphorus compared to untreated soil. Similar increases in potassium, zinc and several micronutrients were also observed in the study.
Figure 1. Percentage increase in fallow soil nutrient content after treatment with EXTRACT PBA. Both P1 and P2 increased with treatment.
Nutrient release with EXTRACT has also been shown to help increase the yields of corn and other crops, as seen in a meta-analysis that includes 86 trial observations across corn, soybeans and wheat (Fig. 2).
Figure 2. The average yield increase with a fall or spring application of EXTRACT PBA was 6.56 bu/acre across 86 trials in corn, soybeans and wheat.
Learn more about EXTRACT PBA by downloading the EXTRACT Product Booklet.
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