Dry Matter Accumulation As A Yield Indicator For Soyabeans (<i>Glycine max</i> L) In The Humid Tropical Rain Forest Zone

Abstract

A field trial was conducted to assess the efficiency of dry matter accumulation in the leaves, petioles, stems and biomass as a yield indicator for soybean variety TGX 536-02D at different developmental stages in the humid tropical rainforest. Linear regressions of the dry matter at the different growth stages on pod and grain yield were carried out. There was no significant difference between the dry matter and pod/grain yield for vegetative growth stages V2, V4 and V6 and reproductive stage R3 in 1994. However, at V4, petiole dry weight had a significant and positive correlation of 0.52* and 0.70* with pod and seed yield, respectively. The reproductive stage R1 showed a highly positive relationship between the dry matter in all plant parts considered and seed/pod yield. The 1995 results gave an indication of a positive/significant relationship between the dry matter accumulation in all plant parts at V6, R1 and R3 stages with pod and grain yield. It was generally observed that the R1 stage consistently had significant effects of dry matter accumulation of seed and pod yield. It was also evident that aacumulation of dry matter in the leaflets tended to have more consistently higher values for both years than other individual parts. Biomass showed a more consistent high correlation than any individual part for both grain and pod yield.

Journal of Applied Chemistry and Agricultural Research Vol. 5 1998: pp. 62-67