Petiole sap nitrate concentration to assess crop nitrogen status of greenhouse sweet pepper
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URI: http://hdl.handle.net/10835/14789
DOI: https://doi.org/10.1016/j.scienta.2021.110157
DOI: https://doi.org/10.1016/j.scienta.2021.110157
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Rodríguez, Alejandra; Peña-Fleitas, María Teresa; Padilla Ruiz, Francisco Manuel; Gallardo Pino, Marisa; Thompson, Rodney B.Fecha
2021-07-27Resumen
Vegetable production requires improved nitrogen (N) management practices. Monitoring petiole sap nitrate concentration ([NO3−–N]) is a simple and cheap method to evaluate crop N status. The sensitivity of petiole sap [NO3−–N] to assess crop N status of sweet pepper was evaluated. Three sweet pepper crops were grown in different cropping seasons, each with an autumn-winter growing period. The crops commenced in 2014, 2016, and 2017. Combined fertigation and drip irrigation frequently applied (every 1–4 days) complete nutrient solution throughout each crop. The crops were grown in a greenhouse in soil. Five N treatments as N concentrations were applied throughout each crop: N1 (2.0–2.4 mmol L−1); N2 (5.3–6.2 mmol L−1); N3 (9.7–12.6 mmol L−1); N4 (13.1–16.1 mmol L−1); N5 (16.7–20.0 mmol L−1). These corresponded to very deficient, deficient, conventional, excessive and very excessive N supply. Petiole sap [NO3−–N] was determined every 1–2 weeks and related to Nitrogen Nutrition Index (NNI)...