Article by Dave Dyson
This is the second article in a four part series outlining the reasons why micronutrients may be used in small quantities, yet deliver giant rewards.
Boron, one of the micronutrients that is essential for crop health, also happens to be one of the most deficient micronutrients in the majority of fields. According to A&L Great Lakes Laboratories, 94.1% of all agriculture soil samples that they processed in 2018 show boron test results that are below 1.2ppm. When applying boron, growers will likely see positive returns until the soil test reaches 2ppm. Based on A&L’s data, over 95% of all fields would show a positive result from applying an application of boron. Figure 1 shows a decrease of boron in the soil over time. It also shows an increase in the percentage of soil samples that are deficient in boron.
Figure 1: This chart shows the decline in boron amounts over time in soil samples submitted to A&L Great Lakes Laboratories.
One of boron’s main roles in the plant’s physiology is forming and strengthening cell walls. The concentration of boron is different among species. Dicots (soybeans and alfalfa) require higher levels than monocots (corn and wheat), and therefore, they demand higher boron levels. Boron is very instrumental in root and pollen tube elongation.
Boron deficiencies can result in short and thick cell walls that can inhibit both root uptake and reproduction. Flowers can fail to set seeds, and research also shows that boron is important in nitrogen fixation and nodulation in legumes. Plants deficient in boron have a decreased rate of water absorption and translocation of sugars in plants. While boron is an important nutrient on its own, it also has a positive impact on the uptake of potassium and phosphorus in many plants. The uptake of potassium and phosphorus can be severely reduced under low boron conditions.