Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : The effects of various irrigation and nitrogen levels on gas exchange of cotton leaves

Auteur : Favers, Kyle Lee

Université de soutenance : Texas Tech University (TTU)

Grade Master of Science (MS) 1986

Résumé
The availability of an adequate water supply throughout the life cycle of crop plants is the single most important limitation to crop yields. This is especially true in cotton production in the Southern High Plains of Texas. However, during those periods when the water supply is adequate, growth rates are frequently limited by nutrient supply. The general response of crop plants to water stress is a reduction in photosynthetic capacity (both photosynthetic rate and leaf area) resulting in a slower growth rate and lower yields. Many of the same symptoms are observed in plants suffering from a nitrogen deficiency. Recent evidence indicates that an interaction exists between water supply and N supply regulating growth rates. Although preliminary, the evidence would suggest that the photosynthetic process may be the primary site of damage resulting from both water and N stress. The objective of this study was to examine the possible interaction of water and nitrogen supplies on carbon assimilation rate and associated stomatal conductance in an effort to better understand the factors controlling gas exchange efficiency as it affects productivity and water use efficiency of the cotton plant.

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