Effect of water stress during soybean reproductive stages under nethouse conditions

  • Vũ Ngọc Thắng

Abstract

This study was carried out to examine the effect of water stress on three reproductive stages of two soybean cultivars, DT 84, and M103 in a pot experiment under nethouse environment in comparison with full irrigation. For water stress treatments, irrigation was withheld at three developmental stages: beginning of flowering (R1); full bloom to beginning of pod (R2-3) and beginning of seed to full seed (R5-6). Water stress was imposed until 70 % of plants or 75 % of leaves per plant withered and afterward relieved by re-watering for recovery and yield assessment (watered as control). Under water stress, the rate of photosynthesis, leaf water deficit, chlorophyll content and individual grain yield were all adversely affected. Grain yield reductions (seed weight and seed yield) were greatest when water deficit occurred at the beginning of seed to full seed.  Both soybean cultivars appeared susceptible to water stress
điểm /   đánh giá
Published
2012-11-19
Section
Bài viết