Nitrogen in soil and subsurface drip-irrigated processing tomato plants (Solanum lycopersicum L.) as affected by fertilization level
| Autor: | E.M. Miyao, Michael Cahn, T. A. Turini, Daniel Geisseler, B. J. Aegerter |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine biology Soil organic matter chemistry.chemical_element Drip irrigation Horticulture engineering.material biology.organism_classification 01 natural sciences Nitrogen 03 medical and health sciences chemistry.chemical_compound 030104 developmental biology Human fertilization chemistry Agronomy Nitrate engineering Environmental science Fertilizer Solanum Nitrogen cycle 010606 plant biology & botany |
| Zdroj: | Scientia Horticulturae. 261:108999 |
| ISSN: | 0304-4238 |
| Popis: | Over the last 20 years, subsurface drip irrigation has been widely adopted for processing tomato (Solanum lycopersicum L.) production in California. Subsurface drip irrigation allows application of water and nitrogen (N) fertilizer throughout the season. As a result, optimal N fertilization approaches are likely different than for furrow-irrigated systems. A project was initiated to develop and validate an N fertilization budget with site specific input for drip-irrigated processing tomatoes. Nitrogen partitioning in the aboveground biomass was determined in ten commercial fields. At harvest, the N concentration in the fruit averaged 1.5 g N kg−1, which accounted for 64% of the total N in the aboveground biomass. A budget, which considered residual soil mineral N, nitrate in the irrigation water and N mineralized from soil organic matter, was implemented in a replicated field trial with three application rates ranging from 152 to 306 kg ha−1. Average yields reached 130 and 140 Mg ha−1 in 2017 and 2018, respectively. Nitrogen application rates had no significant effect on yield. However, across both years the total N in the aboveground biomass increased significantly by 0.875 kg kg-1 of additional N. Nitrogen mineralization of residues incorporated after the tomato harvest was slow during the winter, with soil nitrate levels in the top 60 cm of the profile not being different from soil where the residues had been removed after the tomato harvest. |
| Databáze: | OpenAIRE |
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