Características agronômicas da soja em função da adubação nitrogenada associada à inoculação de Bradyrhizobium japonicum

Zuffo, Alan Mário; Ufms,; Aguilera, Jorge González; Yokota, Lidiane Arissa; Morais, Denise Batista de; Filho, Fábio Nogueirol dos Santos; Fonseca, Wéverson Lima

doi:10.46420/9786581460006cap1

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“…At sowing on 24 November 2015, 115 kg ha -1 monoammonium phosphate (MAP) were applied in the seed furrow (11-52-00) (Sousa and Lobato, 2004). Soybean seeds were inoculated with Bradyrhizobium japonicum using the Simbiosis Nod Soja liquid commercial inoculant (Symbiosis: Biological Agrotechnology, Brazil) containing the SEMIA 5079 and SEMIA 5080 strains (minimum concentration of 72 × 109 viable cells mL -1 ) at a 150 mL rate for 50 kg of seeds (Zuffo et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

Efficiency of critical level and compositional nutrient diagnosis methods to evaluate boron nutritional status in soybean

Traspadini

Wadt²,

Mello-Prado

et al. 2022

Chil. j. agric. res.

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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 deficiency 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 .

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Section: Methodsmentioning

confidence: 99%