連大進 黃明得 吳振碩
Surveys on Natural Disasters in Soybean and Yield Loss Caused by Flooding
Lien, T. J., M. T. Huang and C. S. Wu
Preventing of yield and quality losses of soybean from natural disasters are needed. For understanding the occurrences of natural disasters during soybean growing stages and evaluation the losses of soybean caused by flooding, investigation and evaluation of soybean losses induced by natural disasters and flooding are required. In Tainan area, there were 3 damaged by typhoon in the summer of 1992 and 2 damages by rain in the spring of 1993. These natural disasters caused heavy damaged of soybean including decay of pod, break of branch, lodging, and reduction of seed yield (7.3%~81.5%). In Kao-King areas, there was rain damages happened in the summer while wind damages were in the fall of 1991. One strong thunderstorm with hailstone was found in the spring of 1992. These natural disasters caused heavy damages of soybean including losses of leaves and pods, lodging, and reduction of seed yield (38.4%~100%) and quality of soybean. Seed yield and quality of soybean were significantly reduced when plants were drenched by irrigation water for three days. Pods number, 100-seed weight were decreased while plant height, lodging, stained and number of immatured seeds were increased by flooding. Highest yield reductions were found at late stages (R4~R8) for soybean frown at Tainan (12.5~35% at R7, R8) plots.
Key words: soybean, natural disasters, yield loss, flooding stress
Accepted for publication: April 11, 1996