关键词: 根系分区交替灌溉, 棉花, 生长, 水分利用效率

Abstract: 【Objective】The objective of this study is to evaluate the effect of alternate partial root zone irrigation on taproot crop growth and its water use. 【Method】Potted cotton (Gossypium hirsutum cv Shaan 392) experiment was conducted in green house to investigate the response of growth and water use of with three partial root zone irrigation patterns i. e., alternate partial root zone irrigation (APRI), fixed partial root zone irrigation (FPRI) and whole root zone irrigation.【Result】The results showed that APRI reduced ‘luxury’ transpiration without much reduction in photosynthesis rate by slightly limiting stomatal opening. Leaf water potential showed that cotton under APRI had more ability of osmotic regulation to maintain higher leaf turgor. 【Conclusion】It suggested that APRI has great potential to save water and also maintain the balance between vegetative and reproductive growth with reduced redundancy growth. It regulated the distribution of photosynthesis products and ratio between root and shoot. Meanwhile, the compensating effects of root growth and hydraulic conductivity were also observed

Key words: Alternate partial root zone irrigation, cotton, growth, water use efficiency