RESPOSTAS FISIOLÓGICAS NA CULTURA DO AMENDOIM IRRIGADO COM ÁGUAS SALINAS E FERTILIZAÇÃO ORGANOMINERAL

José Thomas Machado de Sousa; Geocleber Gomes de Sousa; Elane Bezerra da  Silva; Francisco Barroso da  Silva Junior; Thales Vinícius de Araújo  Viana

doi:10.1590/1983-21252021v34n320rc

Authors

José Thomas Machado de Sousa Department of Agricultural Engineering, Universidade Federal do Ceará, Fortaleza, CE https://orcid.org/0000-0001-9460-1461
Geocleber Gomes de Sousa Rural Development Institute, Universidade da Integração Internacional da Lusofonia Afro-Brasielira, Redenção, CE https://orcid.org/0000-0002-1466-6458
Elane Bezerra da Silva Department of Soil Sciences, Universidade Federal do Ceará, Fortaleza, CE https://orcid.org/0000-0002-3224-7791
Francisco Barroso da Silva Junior Department of Soil Sciences, Universidade Federal do Ceará, Fortaleza, CE https://orcid.org/0000-0001-9203-3886
Thales Vinícius de Araújo Viana Department of Agricultural Engineering, Universidade Federal do Ceará, Fortaleza, CE https://orcid.org/0000-0003-0722-6371

DOI:

https://doi.org/10.1590/1983-21252021v34n320rc

Keywords:

Arachis hypogaea L. Salinity. Organic fertilizer. NPK.

Abstract

The use of organo-mineral fertilizer is an alternative measure to mitigate salt stress in semiarid regions. Thus, the objective of this work was to evaluate the physiological indexes of peanut crops under irrigations with fresh and brackish waters and applications of organo-mineral fertilizers. The experiment was conducted from June to September, 2019, at the Universidade da Integração Internacional da Lusofonia Afro-Brasileira (UNILAB), in Redenção, state of Ceará, Brazil, using a completely randomized experimental design in a 5 × 2 factorial arrangement, with four replications. The treatments consisted of five soil fertilizers (F1= 100% NPK mineral fertilizer at the recommended rate; F2= 100% bovine manure-based biofertilizer; F3= 100% plant ash; F4= 50% mineral fertilizer and 50% bovine manure-based biofertilizer; and F5= 50% mineral fertilizer and 50% plant ash); and two salinity levels (electrical conductivities) of the irrigation water (1.0 and 5.0 dS m-¹). Photosynthetic rate, transpiration, stomatal conductance, leaf temperature, internal CO2 concentration, water use efficiency, and chlorophyll index of the plants were evaluated at 40 and 54 days after sowing (DAS). Plants irrigated with fresh water presented higher stomatal conductance, photosynthetic rate, and transpiration, regardless of the fertilizer used. The use of 100% bovine manure-based biofertilizer resulted in decreases in salt stress and increases in water use efficiency at 40 DAS, and decreases in leaf temperature and increases in relative chlorophyll content at 54 DAS.

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