Foliar feeding of plant nutrients is a relatively new agricultural technique compared to the long history of agriculture, and consequently is often poorly understood. research on foliar applications of nutrients and have obtained some excellent results.
Research found plants can absorb nutrients through their leaves and bypass nutrient uptake through the root system. nutrients are directly absorbed through the leaves.underneath side of young leaves absorbed better than the underneath side of older leaves.
Leaves have transcuticular pores (i.e. pores between cell structures) and stomata through which nutrient sprays can enter the plant. The transcuticular pores are on both the upper and lower surfaces of leaves and are open all the time, so foliar-applied nutrients are believed to primarily enter through these pores.experiments showed that buds, twigs, the trunk, flowers and fruit all absorbed nutrients.