Derivation of sufficiency values of a chlorophyll meter to estimate cucumber nitrogen status and yield
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Padilla Ruiz, Francisco Manuel; Peña-Fleitas, María Teresa; Gallardo Pino, Luisa; Giménez Padilla, Carmen; Thompson, RodneyFecha
2017-07-20Resumen
Chlorophyll meters are a promising approach for monitoring crop N status of intensively-produced vegetable
crops. To do so effectively, it is fundamental that the nature and strength of the relationships
between chlorophyll measurement and actual crop N status and yield, throughout the whole crop cycle,
be evaluated. Another fundamental requirement for the practical use of chlorophyll meters for crop N
monitoring is the availability of sufficiency values or ranges, for a given crop, that indicate N deficiency
(below the value) or sufficiency (above the value). The SPAD-502 meter was evaluated as an estimator of
crop N status and yield in cucumber, and sufficiency values of SPAD measurements were derived for maximum
crop growth and for yield. Two crops were grown in soil in a greenhouse in Almeria (SE Spain), in
different cropping cycles, in Autumn 2013 (from early September to late November) and in Spring 2014
(from early March to late May). Chlorophyll measurements were made ...
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Producción vegetal