PRODUCTIVITY AND QUALITY OF POTATOES UNDER DIFFERENT POTASSIUM FERTILIZER SOURCES

Author:

OLIVEIRA ROBERTA CAMARGOS DE1ORCID,SANTOS JUNIOR NILSON ERITO TIMÓTEO DOS1ORCID,FERRAZ-ALMEIDA RISELY2ORCID,LANA REGINA MARIA QUINTÃO1ORCID,CASTOLDI RENATA1ORCID,LUZ JOSE MAGNO QUEIROZ1ORCID

Affiliation:

1. Universidade Federal de Uberlândia, Brazil

2. Universidade de São Paulo, Brazil

Abstract

ABSTRACT The objective of this study was to evaluate potassium and chloride accumulation in, and the yield and quality of the potato tubers of the Asterix cultivar, under the application of two potassium fertilizer sources (KCl and K2SO4.2MgSO4) and their combinations. The experimental design was a randomized complete block with five treatments and four replications in a factorial scheme with a subdivided plot. The presence of greater than 61.8% of the recommended dose of chloride in potassium fertilization affects potato plant growth, with less dry matter accumulation in the aerial part. This does not occur in the tubers because of lower nutrient translocation to the tubers. K accumulation varies between levels depending on the companion ions of the sources. Throughout the cycle, the amount of chloride increased in the aerial parts and tubers with an increase in the percentage of KCl. The total productivity is affected by the use of a combination of potassium sources in different proportions, with a maximum yield of 41.3 t ha-1 with a combination of 64.5% KCl and 36.5% K2SO4.2MgSO4. Soluble solids did not vary with the sources at a dose of 180 kg ha-1 K2O.

Publisher

FapUNIFESP (SciELO)

Subject

General Agricultural and Biological Sciences

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