Responses of Soybean Varieties to Saturated Soil culture

Abstract

A series of two experiments were conducted to study the responses of five soybean varieties under saturated soil culture at Kasetsart University, Kamphaengsaen campus in 1986 late rainy season and 1987 dry season. Asplit plot desigh in RCB with 3 replications was employed with soil-water regimes as main plot and soybean verieties as subplot. Main plots were conventional varieties were locally recommended varieties except A 138 and P 44 which were introduced from Australia. It was found that under saturated soil culture growth and yield of soybean tended to be lower than conventional irrigation and local varieties seemed to be more affected than Australian varieties. In terms of dry weight accumulation soybean varieties tended to saturated soil culture but nodule production and nitrogen especially in later stages of growth. However yield and yield components of both methods were not statistically sighificantly though in favour of saturated soil culture. It was found that Thai varieties adapted and yield quite well under saturated soil culture though inferior to introduced varieties. It could be concluded that raising yield level in saturated soil culture is possible if late varieties are grown in dry season where prevailing environmental conditions are more favourable.