Complementary study of boron absorption by coffee leaves using the neutron-capture-radiography method

Area of Science:

• Agricultural Science
• Plant Physiology
• Radiography Applications

Background:

• Boron is an essential micronutrient for coffee plant growth and development.
• Foliar application is a common method for delivering boron to coffee crops.
• Understanding the efficiency of foliar boron absorption is crucial for optimizing fertilization strategies.

Purpose of the Study:

• To quantify the rate of boron absorption by coffee plant leaves.
• To assess the time required for complete boron uptake from foliar sprays.
• To evaluate the utility of neutron capture radiography for studying nutrient absorption in plants.

Main Methods:

• Young coffee plants were treated with a 10B-enriched boron solution applied as a droplet to leaves.
• Nutrient absorption was measured using neutron capture radiography.
• The technique was applied to micro-samples of liquid.

Main Results:

• The rate of boron absorption by coffee leaves ranged from 1.9 to 5.3 nmol boron per hour.
• Several days are required for a coffee leaf to absorb the majority of boron applied via foliar spray.
• Neutron capture radiography proved sensitive and applicable even with low neutron flux.

Conclusions:

• Foliar boron application to coffee plants results in slow nutrient absorption, requiring an extended period for uptake.
• Neutron capture radiography is a viable and sensitive method for quantifying micronutrient absorption in plant tissues.
• Optimized timing and application methods for foliar boron fertilizers in coffee cultivation may be necessary.