ISHS Acta Horticulturae 822: VI International Pineapple Symposium
PRELIMINARY DRIS NORMS FOR 'SMOOTH CAYENNE' PINEAPPLE AND DERIVATION OF CRITICAL LEVELS OF LEAF NUTRIENT CONCENTRATIONS |
| Authors: | L.A.J. Teixeira, J.A. Quaggio, F.C.B. Zambrosi |
| Keywords: | Ananas comosus var. comosus, macronutrients, plant analysis, plant nutrition |
| Abstract:
Preliminary Diagnosis and Recommendation Integrated System (DRIS) norms and critical leaf nutrient levels (CLN) for ‘Smooth Cayenne’ pineapple growing in plantations of São Paulo State (Brazil) are presented. DRIS norms and CLN were established from a data bank of leaf nutrient concentration (N, P, K, Ca and Mg) and fruit yield with 104 samples. The data bank comprises information from four fertilization experiments with ‘Smooth Cayenne’ conducted on a sandy and low fertility Alfisol located in the municipality of Agudos (22°30’S, 49°03’W), which is typical for this important pineapple production region in Brazil. The data were divided into high-yielding (>65 t/ha) and low-yielding (<65 t/ha) sub-populations and norms were computed using standard DRIS procedures. These norms were developed with data from only one cropping region, so they should be considered as preliminary, probably requiring some modification as more data become available. The regression between nutrient balance index and fruit yield was significant (R2=0.44; p<0.0001; n=104). The CLNs were derived using multiple linear regression relating the foliar nutrient concentration with DRIS indices of all nutrients. The CLNs for N, P, K, Ca, and Mg were 12.0, 0.92, 21.4, 4.0, and 2.8 g/kg, respectively. These values were similar to those presented in the literature, except for Ca whose value is lower for local conditions. | |
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