Effect of organic fertilization on carbon assimilation and partitioning in bearing nectarine trees

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• 作者：Katherine Bravo ; Moreno Toselli ; ^{moreno.toselli@unibo.it} ; Elena Baldi ; Graziella Marcolini ; Giovambattista Sorrenti ; Maurizio Quartieri ; Bruno Marangoni
• 关键词：OM ; organic matter ; PAR ; photosynthetic active radiation ; SIR ; substrate induced respiration ; DW ; dry weight ; T ; time
• 刊名：Scientia Horticulturae
• 出版年：2012
• 期刊代码：93_03044238
• 类别：abs
• 出版时间：1 April, 2012
• 卷：137
• 期：Complete
• 页码：100-106
• 文件大小：462 K

摘要

The aims of this study were to evaluate the effect of organic fertilization on carbon dioxide (CO₂) fixation, carbon (C) partitioning and growth of potted nectarine trees (Prunus persica L. Batsch), cv. 鈥極rion鈥? to verify the hypothesis that organic fertilizers may promote root growth to the detriment of canopy and fruit biomass. The following four treatments were compared as in a complete randomized block design: unamended control, cow manure at a rate of 20 g dry weight (DW) kg soil fresh weight (FW^鈭?), compost (20 g DW kg soil FW^鈭?) and compost (60 g DW kg soil FW^鈭?). Trees were potted in 40 L-pots with a clay-loam Bathicalci Eutric Cambisols soil and sand at a rate of 3:1. Tree canopies were labeled with 99%¹³C enriched CO₂ and nineteen days after the pulse and at the end of the vegetative season, 3 trees per treatment were harvested and analyzed. The addition of compost at the highest rate was effective in increasing CO₂ fixation, promoting root and shoot growth, with no effect on fruit biomass, compared to the unamended control. The higher CO₂ fixation was the result of a larger tree growth rate and leaf area, rather than an increase in leaf photosynthetic efficiency. The involvement of nitrogen (N) uptake was not clear, since N leaf concentration was decreased by organic fertilizations.