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Emitters uneveness used in fertigation with biofertilizer

Abstract

This work aimed at verifying the usefulness of the use of biofertilizer in the fertigation through a micro-sprinkler irrigation system. This work was performed in the experimental field of Embrapa Cassava and Fruit growing, in Cruz das Almas, Bahia, Brazil, with the duration of 380 days. The experimental design was in randomized blocks with three repetitions, in a scheme of sub-subdivided plots. The plots consisted on the number of days after the beginning of the application of treatments; the subplots consisted on the different outflows of the emitters which were 30, 40, 50, and 70 L h−1; and the sub-subplots were the concentrations of 50 and 75% of the biofertilizer. The assessed variables were: relative outflow, clogging degree and water distribution uniformity coefficient of the emitters. The analysis of variance showed interaction between the different outflow of the emitters and the concentrations of biofertilizer for all the variables. The emitters’ water distribution uniformity coefficient decreased with the time, with a greater decrease for the emitters with outflow of 30 L h−1. The different biofertilizer concentrations did not influence the relative outflow for the micro-sprinkler with outflow of 30 L h−1. The micro-sprinklers presented, at the end of the assessment period, a clogging degree of moderate severity. The micro-sprinkler with outflow of 70 L h−1, with diameter of 1.2 mm, was the most adequate for the application of the biofertilizer with suspended solids content equal to 14.8 g L−1.

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Acknowledgements

We thank FAPESB for providing the scholarship for the development of this work.

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Correspondence to Damiana L. Barros.

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Barros, D.L., Coelho, E.F., de Andrade, T.P. et al. Emitters uneveness used in fertigation with biofertilizer. Irrig Sci (2021). https://doi.org/10.1007/s00271-021-00743-1

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