AGRONOMIC PERFORMANCE AND FRUIT QUALITY OF YELLOW MELON FERTILIZED WITH DOSES OF NITROGEN AND POTASSIUM

MOREIRA, LUIS CLENIO JÁRIO; DA SILVA, LUCIVÂNIO DOMINGOS; DO NASCIMENTO, BEATRIZ MAIA; DA SILVA, ANDRÉ JEFFESON BARROS; TEIXEIRA, ADUNIAS DOS SANTOS; DE OLIVEIRA, MARCIO REGYS RABELO

doi:10.1590/1983-21252022v35n208rc

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Research Paper • Rev. Caatinga 35 (02) • Apr-Jun 2022 • https://doi.org/10.1590/1983-21252022v35n208rc copy

AGRONOMIC PERFORMANCE AND FRUIT QUALITY OF YELLOW MELON FERTILIZED WITH DOSES OF NITROGEN AND POTASSIUM

DESEMPENHO AGRONÔMICO E QUALIDADE DOS FRUTOS DE MELÃO AMARELO ADUBADO COM DOSES DE NITROGÊNIO E POTÁSSIO

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The objective of this study was to evaluate the assimilated contents of mineral elements, yield characteristics and fruit quality of ‘Goldex’ yellow melon fertigated with different doses of nitrogen (N) and potassium (K) in two years of cultivation in the region of Apodi Plateau-CE. The design was randomized blocks in a 4x3 factorial scheme with four N doses (0%, 50%, 100%, 150% of the recommended dose) and three K doses (0%, 100%, 150% of the recommended dose). In the shoots of the melon plant, the highest levels of N (N Fert.) and K (K Fert.) fertilization promoted an increase in the assimilated N content up to 48 DAT and a reduction in the assimilated K content at the end of the cycle (62 DAT). The maximum shoot dry mass production was 3.23 t ha⁻¹ with a fertilization of 150 and 100 kg ha⁻¹ of N and K, respectively. The average marketable fruit yield obtained in the two years of cultivation was 34.68 t ha⁻¹, reaching a maximum value of 40.28 t ha⁻¹ under 150 kg ha⁻¹ N and K fertilization. Total soluble solids increased as a function of the increase in N Fert. and K Fert., with a maximum value of 8.07 °Brix. The models indicated that the K Fert. factor was decisive in the increase of this variable. In future studies it is necessary to increase the concentrations of the two factors in order to optimize the maximum viability of yield and °Brix.

Keywords
Cucumis melo L.; Nutrient absorption; Mineral nutrition; Yield

Cycles	pH H₂O	EC	C	OM	P	K⁺	Na⁺	Ca²+	Mg²+
Cycles	pH H₂O	dS/m	g^/kg		mg/dm³		mmol/dm³
2018 (I)	7.37	0.76	5.92	10.21	12.25	16.52	1.22	49.07	22.65
2019 (II)	7.25	1.23	11.40	19.65	43.00	19.58	2.44	86.55	19.20

Sources of Variation	^{N (}g^kg^{-1) 48 DAT}	K (g kg⁻¹) 48 DAT	N (g kg⁻¹) 62 DAT	K (g kg⁻¹) 62 DAT	SDM (t ha⁻¹)	F/P	YLD (t ha⁻¹)	°Brix
Blocks (Agricultural years)	1.90 ^ns ns =P>0.05.	0.84 ^ns ns =P>0.05.	3.01 ^ns ns =P>0.05.	0.84^ns ns =P>0.05.	0.32^ns ns =P>0.05.	0.41 ^ns ns =P>0.05.	0.96 ^ns ns =P>0.05.	1.36 ^ns ns =P>0.05.
Agricultural years (Y)	365.35^ =P<0.01;	233.45^ =P<0.01;	16.71^ =P<0.01;	1701.79^ =P<0.01;	7.09^ =P<0.01;	15.87^ =P<0.01;	49.52^ =P<0.01;	22.84^ =P<0.01;
N Fert. (N)	8.79^ =P<0.01;	12.67^ =P<0.01;	20.13^ =P<0.01;	14.21^ =P<0.01;	12.37^ =P<0.01;	3.08^* * =P<0.05;	10.87^ =P<0.01;	6.55^ =P<0.01;
K Fert. (K)	0.96^ns ns =P>0.05.	1.38^ns ns =P>0.05.	0.77^ns ns =P>0.05.	0.69^ns ns =P>0.05.	3.98^* * =P<0.05;	1.12 ^ns ns =P>0.05.	3.76^* * =P<0.05;	46.77^ =P<0.01;
YxN	1.68^ns ns =P>0.05.	5.18^ =P<0.01;	9.15^ =P<0.01;	7.80^ =P<0.01;	1.13^ns ns =P>0.05.	1.40 ^ns ns =P>0.05.	2.08 ^ns ns =P>0.05.	0.59 ^ns ns =P>0.05.
YxK	1.60^ns ns =P>0.05.	0.45^ns ns =P>0.05.	0.27^ns ns =P>0.05.	0.41^ns ns =P>0.05.	1.35^ns ns =P>0.05.	1.38 ^ns ns =P>0.05.	7.62^ =P<0.01;	0.42 ^ns ns =P>0.05.
NxK	2.43^* * =P<0.05;	0.53^ns ns =P>0.05.	1.20^ns ns =P>0.05.	3.03^* * =P<0.05;	4.13^ =P<0.01;	0.90 ^ns ns =P>0.05.	3.56^ =P<0.01;	3.73 ^ =P<0.01;
YxNxK	2.74^* * =P<0.05;	1.27^ns ns =P>0.05.	3.06^* * =P<0.05;	3.13^ =P<0.01;	0.37^ns ns =P>0.05.	0.32 ^ns ns =P>0.05.	3.53^ =P<0.01;	0.88 ^ns ns =P>0.05.
CV (%)	11.2	24.75	9.01	12.8	49.18	24.05	12.57	8.11
Means of agricultural years
2018	25.87 b	65.07 a	35.51 b	74.24 a	1.97 b	2.19 a	37.81 a	7.17 b
2019	40.33 a	28.82 b	38.28 a	22.25 b	2.02 a	1.80 b	31.55 b	7.76 a

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