Modelling plant yield and quality response of fresh-market spinach (Spinacia oleracea L.) to mineral nitrogen availability in the root zone
| Autor: | Alberto Pardossi, Giulia Carmassi, Rita Maggini, Daniele Massa, Luca Incrocci, L. Botrini, C. Diara, Giorgio Incrocci, Pasquale Delli Paoli |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Mediterranean climate chemistry.chemical_element lcsh:Plant culture 01 natural sciences Fertilisation lcsh:Agriculture Crop Nutrient Yield (wine) lcsh:SB1-1110 Leaf nitrates SPAD index biology Photothermal units Crop yield Leafy vegetable lcsh:S Nitrogen nutrition index Agronomy and Crop Science food and beverages 04 agricultural and veterinary sciences biology.organism_classification Nitrogen Agronomy chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries DNS root zone Environmental science Spinach 010606 plant biology & botany |
| Zdroj: | Italian Journal of Agronomy, Vol 13, Iss 3 (2018) |
| ISSN: | 2039-6805 1125-4718 |
| DOI: | 10.4081/ija.2018.1120 |
| Popis: | Spinach is one of the most important green-leafy vegetables, consumed worldwide, and its intake is beneficial for human beings. In this crop, produce yield and quality are closely related to plant nitrogen (N) nutrition. A precise supply of N is also essential for high environmental and economic sustainability. Main aims of the work were: i) to establish relationships between produce yield or quality and mineral N availability in the root zone; and ii) to define an optimal mineral N level to be maintained in the root zone for spinach. Eight experiments were carried out during a four-year-long period under typical Mediterranean climate conditions. Different amounts of N fertilisers were supplied leading to twenty different levels of mineral N in the root zone. Experimental measurements included climate parameters, plant growth, tissue and soil analyses, produce yield and quality indicators. A segmented linear model significantly represented the relationship between crop yield (1.7 to 21.7 t ha–1) and soil mineral N concentration (7.6 to 41.0 mg kg–1). Basing on this model, an optimal mineral N threshold was fixed at 23.4 mg kg–1. Above this threshold, crop yield did not show any significant variations as well as tissue characteristics and produce quality. Plants grown under suboptimal N levels showed reduction in growth, tissue mineral (nutrients) content, and SPAD index. The proposed models could be implemented in fertilisation protocols for the optimization of N supply and the estimation of spinach growth and yield. |
| Databáze: | OpenAIRE |
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