Nutritional Diagnosis in Hybrid Coconut Cultivated in Northeastern Brazil Through Diagnosis and Recommendation Integrated System (Dris)

Abstract

-The assessment of the nutritional status of plants by leaf diagnosis such as the Diagnosis and Recommendation Integrated System (DRIS) has stood out among traditional methods of interpreting the results of plant tissue analysis. For coconut, nutritional monitoring through foliar analysis has been pointed as an efficient method for fertilizer recommendation, and the results have been traditionally interpreted using the critical level of sufficiency ranges criteria. The aim of this study was to evaluate the nutritional status and establish nutritional standards for the cultivation of hybrid coconut in the municipality of Moju, Pará, using DRIS. The leaf analysis and productivity results of 134 observations for the period 2001-2011 were used to form the database. The most common deficiencies found were lack of K, and possibly excess of Mg. The order of nutrient limitation was K> P> Ca> Fe> N> O> B> Zn> Cu> Mn> Mg. Ca, Fe and K nutrients are more likely to positively respond to fertilization, since Mg, Cu and Mn were diagnosed as having the greatest likelihood of negative response to fertilization. It was also found that N and P are elements that are in the best nutritional balance condition. Regression equations for the relationship between nutrient content in hybrid coconut leaves and its DRIS indexes were adjusted, which allowed establishing nutrient reference values based on DRIS.

Productivity and nutrition of fertigated açaí palms according to boron fertilization

“…Bras. Frutic., Jaboticabal, 2020, v. 42, n. 2: (e-601) When comparing with the coconut culture, the levels of N, P and Mg are close to what is considered ideal (SALDANHA et al, 2017), taking the fourth leaf as a reference. On the other hand, S and K are below the levels found for coconut, which may be related to high rainfall in the collection period, which causes leaching of nutrients, reducing absorption.…”

“…Higher levels of B, when applied via fertigation, are possibly related to more fractional application and greater availability of water in the summer, due to irrigation, which increases absorption efficiency. Studies in the state of Pará revealed levels of nearly 30 mg kg -1 in leaves of oil palm samples (MATOS et al, 2016) and 15 to 20 mg kg -1 in coconut leaves (SALDANHA et al, 2017) in productive phase. In soils of Kerala, India, the critical variation of B was 7.50 to 13.27 mg kg -1 in the leaves of coconut trees (MATHEW et al, 2018).…”

Establishment of DRIS and CND Standards for Fertigated ‘Prata’ Banana in the Northeast, Brazil

“…1), made it possible to classify 48.3% of the observations as of high yield, indicating that the Cate-Nelson approach used by Khiari et al (2001) was appropriate for this study, as also found by Wairegi and Van Asten (2011) when establishing DRIS and CND standards for banana in the Highlands of East Africa. In other studies, this partitioning method was not always used; instead, the high-yield subpopulation was arbitrarily defined, based only on the expected yield established by the authors (Angeles et al 1993;Saldanha et al 2017).…”

Different criteria for determining DRIS standards influencing the nutritional diagnosis and potential fertilization response of sugarcane

“…This same selection based on high ratio of variance was studied by , Santana et al (2008) and Mourão Filho et al (2002). Saldanha et al (2017) reported that relationships among nutrients selected as DRIS standards for coconut showed a high variance ratio (s 2 b /s 2 a ) and reduced CV, which could be very important for production. Therefore, relationships among nutrients that present high s 2 b /s 2 a indicate low variability of data of high productivity group.…”

“…in diagnosed sample (Serra et al, 2010). Thus, DRIS index of a nutrient consists of mean of deviations of relations of a nutrient with others in relation to their respective optimal values (Saldanha et al, 2017). Each relationship between nutrients in high productivity population is a DRIS standard and has its respective mean and coefficient of variation (Reis Junior and Monerat, 2003).…”