关键词: 干旱胁迫, 拔节期, 青贮玉米, 生育期, 形态, 品质

Abstract: In order to clarify the effect of moderate and severe drought stress at jointing stage on growth character and quality of silage corn, using a grain and feed variety ‘Zhongyuandan 32’ as the experimental material, this paper performed water controlled experiments in rain shed to analyze the change trend of growth period, plant morphology, dry matter mass per plant and quality indexes of silage corn. The results showed that drought stress at the jointing stage delayed growth process of silage corn, extended the interval from jointing to silking by 2～6 d, and shortened the interval from silking to ripening by 1～4 d. Plant height and leaf area were inhibited, dry matter mass per plant, dry to fresh ratio and ear rate decreased. The content of crude protein, acid detergent fiber and neutral detergent fiber increased, the content of dry matter and starch decreased, the comprehensive evaluation indexes relative forage value and grading index decreased. The more severe drought stress was, the longer the drought stress was, the greater the impact on the above indexes of silage maize was. After rehydration, plant height and leaf area showed obvious compensation effect, but compared with normal water supply (T1), equivalent compensation could not be achieved. So drought stress at jointing stage results in slow growth decreased dry matter mass per plant and quality of silage corn.

Key words: drought stress, jointing stage, silage corn, growth period, morphology, quality