Scientia Agricultura Sinica ›› 2007, Vol. 40 ›› Issue (11): 2546-2555 .

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION • Previous Articles     Next Articles

Response of cotton growth and water use to different partial root zone irrigation

  

  1. 中国农业大学水利与土木工程学院/中国农业水问题研究中心
  • Received:2007-03-28 Revised:2007-05-15 Online:2007-11-10 Published:2007-11-10

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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

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