By: Tania June
The effort to scale up soybean production is by agro forestry system. However, these conditions give a response to the plants because the light is reduced by the canopy of trees so that affects the plant microclimate and plant physiology. This study aimed to analyze the effect of using reflective mulch to physiology character and soybean production in shaded and not shaded conditions. The efforts to increase the light that reach the plants is by using reflector. The research conducted in Bogor, West Java Indonesia using nested design-two factors model, the first factor had two levels, respectively shade 50% (N50%) and without shade (N0%). The second factor had reflector mulches three levels, respectively black silver mulch (MP-PH), metalic mulch (MP-MA) and without mulch (M0). The results showed that the using of reflective mulch in 50% shade condition were able to give a positive response to physiology and crop production. The using of mulch increased the rate of plants photosynthesis significantly in 50% shade condition 14.52μmol μmol CO2.m-².s-1 for the black and silver mulch and 18.17μmol CO2.m-².s-1 for metalic mulch, whereas only 12.61μmol CO2.m-².s-1 for the control (M0). The increase of photosynthesis rate was positively correlated in the increase of crop yields 4.79 and 4.79 tons/ha respectively for metallic mulch and silver black mulch, whereas 2.93 tons/ha for without mulch in 50% shade condition. In 0% shade condition, the potential yield were 5.17, 4.11, 3.43 tons/ha respectively for silver black mulch, metallic mulch, and without mulch.
Syahrun Mubarak, Impron, Tania June
Department of Aplied Climatology, Bogor Agricultural University, Indonesia.
Department of Geophysics and Meteorology, Bogor Agricultural University, Indonesia.
Key Words: Soybean, Reflective mulch, Photosynthesis, Low light intensity.