Dris Norms For ‘Keitt’ Mango in Brazilian Semiarid: Diagnosis and Validation

Abstract

Nutritional standards based on long-term data improve the nutritional diagnosis of the crop, as they make norms more precise and establish more refined criteria. This study aimed to evaluate the nutritional status of the mango crop using the DRIS methodology to identify nutritional limitations and validate norms. A da-tabase of 202 commercial plots was used, whose leaves were collected in the floral induction period between 2011 and 2018 in the Brazilian semiarid region. The productivity of 'Keitt' mango under the Brazilian semiarid conditions was not related to NBI-DRIS. Nutrient concentration presents positive and significant relationship with the respective DRIS indices, enabling the determination of the balance point, establishing a nutritional standard and enabling the use of foliar diagnosis for the variety. The order of nutrients with the highest frequency of limitations due to lack, in decreasing order, was: Zn > Al > Na > Cu > S > B > Mn > P = K > Fe > Ca > N > Mg, and limitation due to excess, in decreasing order was: Fe > Na > Mg > Al > Cu > B = N > S > Ca > P = K > Zn > Mn.

DRIS I: elaboración de los índices DRIS en el cultivo de palma de aceite

“…The validation of the nutritional status is carried out through plant tissue analysis as a complementary tool to soil analysis (Tullio and Rozane, 2022). This allows for the identification of the most limiting nutrients in the system and provides evidence for the timely and appropriate use of fertilizers, aiming to achieve high productivity and apply the minimum required quantities with low costs and environmental sustainability (Franco, 2007).…”

“…The planning, validation, and calibration of nutrient doses applied to the oil palm crop are carried out based on sampling and laboratory processing. Various methodologies have been suggested for determining nutritional imbalances and ensuring proper interpretation of the results, which, in conjunction with the achieved yields, lead to the optimization of crop productivity (Tullio and Rozane, 2022;Kamireddy, 2023) Among the methods of nutritional diagnosis, the Diagnosis and Recommendation Integrated System (DRIS) proposed by Beaufils (1973) is a holistic nutrient content interpretation system developed to enhance the interpretation of the nutritional results, regardless of the plant's age. It classifies the elements according to their limitation in crop growth and…”