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Nitrogen and Irrigation Rates Affected Leaf Phosphorus and Potassium Concentrations in Different Cultivars of Pot-Grown Blueberry

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Abstract

This study aimed to evaluate the effect of increasing N rates as ammonium sulfate combined with three irrigation rates on leaf P and K concentrations in 10 blueberry (Vaccinium spp.) cultivars grown in pots with a substrate. Four increasing N rates (0%, 100%, 200%, and 300%) and three irrigation rates (70%, 100%, and 130% of the water requirement) were evaluated on leaf P and K concentrations previous to a winter break of 10 blueberry cultivars grown in pots with a substrate. Overall, the P values were within normal ranges reported for some cultivars of blueberries; however, K values were higher than those reported in other studies, except for “Blue Ribbon.” Treatments affected leaf P and K concentrations, and the N application was usually positively correlated with the leaf P concentration and negatively correlated with the leaf K concentration. The P and K concentration values ranged from 0.05 to 0.26% and 0.61 to 2.70%, respectively.

The highest P and K values were obtained with the N fertilization treatments N 200% ​​and N 0%, respectively; in general, these values ​​were significantly higher with 70% of the water requirement. At the N 100% fertilization rate, all cultivars reached an adequate leaf P concentration, except cv. Blue Ribbon. On the other hand, the different irrigation rates mainly affected leaf P concentration, and, in five of the evaluated cultivars, there was no effect of irrigation on leaf K concentration.

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Acknowledgements

We acknowledge the support of the Fundación Para el Desarrollo Frutícola through Project 16PTECFS-66641.

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Andrés France and Hamil Uribe planned and executed field experiments. The data analysis, draft writing and written informed consent of the manuscript were made by Violeta Muñoz and Juan Hirzel.

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Correspondence to Juan Hirzel.

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Muñoz, V., France, A., Uribe, H. et al. Nitrogen and Irrigation Rates Affected Leaf Phosphorus and Potassium Concentrations in Different Cultivars of Pot-Grown Blueberry. J Soil Sci Plant Nutr 23, 965–973 (2023). https://doi.org/10.1007/s42729-022-01096-0

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  • DOI: https://doi.org/10.1007/s42729-022-01096-0

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