Initial Values of Dris Norms for Artichoke Cv. Blanca De Tudela (Cynara Scolymus L.) in the Provinces of Alicante and Murcia

Martínez, José Dimas López; Giménez, María J.; Ferrández, M. A.; Oltra, M.; Madrid, R.; Rodríguez, V.; Rodríguez, Orlando

doi:10.17660/actahortic.2004.660.40

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“…To obtain the DRIS reference guidelines for the macronutrients for the almond cultivars studied, DRIS calculation was carried out using the Excel program as described in the literature [16,17]. For each nutrient, the mean, standard deviation, and the coefficient of variability were used in the sampling period in which these were stable (see above).…”

Section: Acquisition Of the Dris Normsmentioning

confidence: 99%

Estimation of Diagnosis and Recommendation Integrated System (DRIS), Compositional Nutrient Diagnosis (CND) and Range of Normality (RN) Norms for Mineral Diagnosis of Almonds Trees in Spain

et al. 2021

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To ensure good fertilization, it is necessary to know the optimum nutrient levels for each crop. The most common method for obtaining this information for almond trees is to perform a foliar analysis coupled with the use of interpretive tools such as the traditional range of normality. However, currently, there are other, more sophisticated methods such as the DRIS (Diagnosis and Recommendation Integrated System) and the CND (Compositional Nutrient Diagnosis) which take into account the relationship between nutrients. However, little information is available with respect to these methods in the case of almond trees. In the present work, 288 samples of three contrasting varieties of almond were analyzed—Ferraduel, Ferragnes, and Garrigues (Prunus dulcis, Mill.)—corresponding to bi-weekly sampling between the months of May and September. Leaf analysis data, run with different mathematical and statistical models, lead to knowledge of the optimum period for harvesting samples and the determination of the ranges of normality and norms of DRIS and CND for the Ferraduel, Ferragnes, and Garrigues varieties. Data gained from the leaf nutrient content reported that the best season to harvest and interpret leaf samples was July. In addition, Ferraduel and Ferragnes had higher N, P, and K (2.22, 0.14, and 1.04 mg Kg−1 dw, respectively) than Garrigues (2.00, 0.09. 0.67 mg Kg−1 dw). The norms obtained with the leaf mineral data showed similar values between the Ferraduel and Ferragnes varieties but different values for Garrigues variety. Therefore, Garriges had the highest N/P, N/K, P/K, and P × Mg norms in the DRIS method and the highest VN and VCa norms in the CND method.

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Section: Acquisition Of the Dris Normsmentioning

confidence: 99%