The Effect of Sound Wave and Drought Stress on Stomatal Opening and Soybean Growth

Abstract

Sonic bloom is a technology that stimulates the opening of stomata wider by using frequency sound waves followed by application of liquid fertilizer through the leaves. This study aims to determine the effect of sound wave frequency and drought stress on stomatal opening, nutrient uptake efficiency and soybean production. The experiment using the split plot design with main plot is frequency, F0: without frequency, F2: frequency 2 kHz, F4: 4 kHz and F6: 6 kHz. The sub plot is the soil moisture content, L50: 50% Field Capacity (FC), L75: 75% FC and L100: 100% FC. The results showed that the frequency and soil moisture interaction affect the width of stomata at the 30, 40 and 50 days after planting (DAP), efficiency of nitrogen, phosphorus and potassium uptake. The effect was also significant on the fresh and dry seed weight. The opening width of stomata at 4 kHz at 100% FC soil showed the highest value and not significantly different from the soil moisture of 75% FC. The highest nitrogen uptake efficiency was achieved at 4 kHz treatment at 100% FC, not significantly different from the frequency of 6 kHz at 100% FC. Furthermore, phosphorus and potassium nutrient uptake was found to have the same pattern, where the highest absorption efficiency was obtained at a frequency of 6 kHz with a soil moisture content of 100% FC. Seed production increased 40.89% at a frequency of 4 kHz, and the seeds produced in a 100% soil moisture FC were not unlike the soil moisture of 75% FC.

Keywords: frequency, moisture content, nutrient uptake efficiency, soybean production