Vol. 3, Issue 6 (2018)
Proximate composition and photosynthetic pigments accumulation of soybean evaluated under different light and planting densities
Author(s): Ogunboye Kehinde Dorcas, Olowolaju Ezekiel Dare, Afolabi Akinjide Moses, Adelusi Adekunle Ajayi
Abstract: The objective of this study was to investigate the proximate composition, mineral nutrients and photosynthetic pigment accumulation of soybean observed under different light intensities and planting densities. The intensities of average light determined were 5764 (100%) and 3517 (61%) lux. The two treatments of light regimes were L1=100% light, L2= 61% light. The seeds of soybean were sown at the rate of five seeds (P5), three seeds (P3) and one seed (P1). They were watered daily with 200 mL of tap water in the morning and 200 mL of tap water in the evening until they were fully established. The results obtained showed that the proximate composition such as ash, crude fibre and carbohydrate, mineral elements such as calcium and potassium, photosynthetic pigments accumulation of soybeans were more enhanced under 100% light or full light intensity while iron, protein and fat were enhanced under 61% light or partial light. Magnesium contents was similar under 61% (partial light) and 100% (full light). It can be deduced that the positive effect of the high density (P3 and P5) on the proximate composition, mineral nutrients and photosynthetic pigments accumulation is more than effect of the solitary (P1). In conclusion higher densities and sufficient light is effective for improvement of proximate composition, mineral nutrient contents and photosynthetic pigments accumulation of soybean.