Efficacy of critical level and compositional nutrient diagnosis methods in the boron nutritional status evaluation in soybean

Edilaine I.F. Traspadini1*, Paulo G.S. Wadt2, Renato de Mello-Prado1, Cassiano Garcia-Roque3, Carlos Roberto-Wassolowski3, and Daniel Vidal-Perez4
The efficiency of the boron (B) nutritional status in soybean (Glycine max (L.) Merr.) was evaluated by degree of agreement (DA) indicators using different diagnostic methods and by prescient diagnostic analysis (PDA). The objective of this study was to evaluate the efficiency of two interpretation methods of B nutritional status in soybean, that is, compositional nutrient diagnosis (CND) and critical level (CL). An experimental trial was conducted using a randomized block design with five replicates, which evaluated foliar B application rates of 0, 300, 600, 1200, and 1800 g ha-1. Another study consisted of monitoring 140 commercial farms. We sampled leaves to determine nutrient contents and estimate yield in both studies. All samples were diagnosed by CND and CL methods. A reference value in the literature was obtained by the reduced normal distribution and CL methods by field calibration in the experimental trial. All the methods showed a high DA between diagnoses; the efficiency ratio and accuracy for true deficieny were both low, except for the CL method by field calibration, which exhibited an increase in positive net yield. The DA was ineffective to validate the efficiency of nutritional diagnoses; methods with a higher DA showed negative values for the net increase in production (-46 to -53 kg ha-1). The CL method by field calibration showed greater efficiency in assessing the nutritional status of B in foliar fertilized soybean because the net increase in production was 197 kg ha-1.
Keywords: Boron fertilization, foliar fertilizer, Glycine max, leaf diagnosis, plant nutrition.
1Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Campus Jaboticabal, Vila Industrial, 14884-900, Jaboticabal, São Paulo, Brasil. *Corresponding author (edilainetraspadini@gmail.com).
2Empresa Brasileira de Pesquisa Agropecuária, Embrapa-Rondônia, Rodovia BR-364, km 5,5, 76815-800, Porto Velho, Rondônia, Brasil.
3Universidade Federal de Mato Grosso do Sul, Campus de Chapadão do Sul, Rodovia MS-306, km 105, Zona Rural, 79560-000, Chapadão do Sul, Mato Grosso do Sul, Brasil.
4Empresa Brasileira de Pesquisa Agropecuária, Embrapa-Solos, Rua Jardim Botânico, 1024 - Jardim Botânico, 22460-000, Rio de Janeiro, Brasil.