Effect of nitrogen fertilizer and irrigation on Acacia senegal seedling biomass and photosynthesis Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mc87pt39s

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  • Seedlings of Acacia senegal were grown in a glass greenhouse to study the effect of nitrogen and irrigation regimes on dry matter production and allocation to different plant organs, net photosynthesis per unit leaf area, and nitrogen content in the different plant organs. Ammonium nitrate (NH4NO3) was used in this study, as the source of inorganic nitrogen. The nitrogen treatment consisted of four levels: 0, 30, 100, and 200 ppm of N which were added with the irrigation solution. Irrigation treatment consisted of irrigation every two, five or ten days. Nitrogen fertilization, irrigation regimes, and their interaction significantly affect the total stem, root, and leaf dry weight. However, low and moderate levels of N with irrigation every two days, resulted in higher total plant dry weight. Contrary to the initial hypothesis of the study, net photosynthesis showed no significant differences among the N treatments, but a decrease occurred after the fifth day since irrigation; this was also followed by a low net CO2 uptake. Stomatal conductance was affected significantly by the N and irrigation treatments. Total N content in the whole seedlings, stems, roots, and leaves was found to be high at low to moderate application of N, with irrigation every two days, while percent N in these parts showed a marked increase with increasing the N added. Moreover, percent N in roots showed the highest increase compared to percent N in stems and leaves.
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