PRODUCTIVITY AND QUALITY OF POTATOES UNDER DIFFERENT POTASSIUM FERTILIZER SOURCES

OLIVEIRA, ROBERTA CAMARGOS DE; SANTOS JUNIOR, NILSON ERITO TIMÓTEO DOS; FERRAZ-ALMEIDA, RISELY; LANA, REGINA MARIA QUINTÃO; CASTOLDI, RENATA; LUZ, JOSE MAGNO QUEIROZ

doi:10.1590/1983-21252022v35n410rc

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Agronomy • Rev. Caatinga 35 (4) • Oct-Dec 2022 • https://doi.org/10.1590/1983-21252022v35n410rc copy

PRODUCTIVITY AND QUALITY OF POTATOES UNDER DIFFERENT POTASSIUM FERTILIZER SOURCES

PRODUTIVIDADE E QUALIDADE DE BATATA SOB DIFERENTES FONTES DE FERTILIZANTES POTÁSSICOS

Authorship SCIMAGO INSTITUTIONS RANKINGS

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.

Keywords
Solanum tuberosum L; Chloride; Nutrient accumulation

Treatments	Planting
Treatments	KCl (%)	K₂SO₄.2MgSO₄ (%)
1	0	100
2	25	75
3	50	50
4	75	25
5	100	0

		DMAAP	KAPA	CLAPA	DMAT	KAT	CLAT
	Treatments	0.038^* * Significant at 5% probability by F-test.	0.212 ^ns ns not significant at a 5% probability. CV1, coefficient of variation for the plot; CV2, coefficient of variation for the subplot.	0.005^* * Significant at 5% probability by F-test.	0.006^* * Significant at 5% probability by F-test.	0.496 ^ns ns not significant at a 5% probability. CV1, coefficient of variation for the plot; CV2, coefficient of variation for the subplot.	0.003^* * Significant at 5% probability by F-test.
Time		0.000^* * Significant at 5% probability by F-test.	0.000^* * Significant at 5% probability by F-test.	0.000^* * Significant at 5% probability by F-test.	0.000^* * Significant at 5% probability by F-test.	0.000^* * Significant at 5% probability by F-test.	0.000^* * Significant at 5% probability by F-test.
Treatments^* * Significant at 5% probability by F-test. Time		0.257^ns ns not significant at a 5% probability. CV1, coefficient of variation for the plot; CV2, coefficient of variation for the subplot.	0.217 ^ns ns not significant at a 5% probability. CV1, coefficient of variation for the plot; CV2, coefficient of variation for the subplot.	0.006^* * Significant at 5% probability by F-test.	0.007^* * Significant at 5% probability by F-test.	0.002^* * Significant at 5% probability by F-test.	0.000^* * Significant at 5% probability by F-test.
CV¹		31.90	37.62	46.62	22.89	26.89	28.68
CV²		23.11	27.99	37.65	25.04	28.80	44.69
Average		40.43	1.88	1.52	192.45	4.95	1.28

	Total	Special	Commercial	Discard	Non-standard	Solid soluble
Treatments	0.019^* * Significant at 5% probability by F-test.	0.004^* * Significant at 5% probability by F-test.	0.228 ^ns ns , not significant at a 5% probability. CV, coefficient of variation.	0.875 ^ns ns , not significant at a 5% probability. CV, coefficient of variation.	0.193 ^ns ns , not significant at a 5% probability. CV, coefficient of variation.	0.115 ^ns ns , not significant at a 5% probability. CV, coefficient of variation.
CV	12.19	14.77	17.17	55.26	37.93	11.05
Average	37.81	23.90	12.59	0.81	0.51	19.3

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