Post-harvest indices and color parameters in beet roots intercropped with lettuce under organic fertilization and population densities

GUERRA, Natan Medeiros; SANTOS, Elizangela Cabral dos; BEZERRA NETO, Francisco; LIMA, Jailma Suerda Silva de; Nascimento PORTO, Vania Christina do; Silva LINO, Vitor Abel da; QUEIROGA, Roberto Cleiton Fernandes

doi:10.1590/fst.05822

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Original Article • Food Sci. Technol 42 • 2022 • https://doi.org/10.1590/fst.05822 copy

Post-harvest indices and color parameters in beet roots intercropped with lettuce under organic fertilization and population densities

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The objective of this study was to evaluate and estimate the post-harvest indices and color parameters of beet roots in intercropping with lettuce under green manuring with different equitable amounts of M. aegyptia and C. procera biomass (20, 35, 50 and 65 t ha^-1 on a dry basis) in diverse population densities of lettuce (150, 200, 250 and 300 thousand plants ha^-1), in two cropping seasons in semi-arid environment. The lettuce crop presented the best post-harvest indexes when submitted to fertilization with an amount of M. aegyptia and C. procera biomass of 20 t ha^-1 in lettuce population densities between 203 and 300 thousand plants per hectare. The beet crop reached the best indices when it was manured with amounts of the green manures between 20 and 55 t ha^-1 and between lettuce population densities of 150 and 300 thousand plants per hectare. The color parameters of purple/red beet roots (well appreciated by the consumers) were obtained in the amounts of green manures between 25 and 65 t ha^-1 and between lettuce population densities of 280 and 300 thousand plants per hectare.

Keywords:
Lactuca sativa; Beta vulgaris; Merremia aegyptia; Calotropis procera; post-harvest quality

Sources of variation	Degree of freedom	Titratable Acidity	pH	Soluble solids	SS/TA ratio
Blocks	3	1.16ns	1.30^ns	1.48^ns	1.74^ns
Amounts of M. aegyptia and C. procera biomass (A)	3	3.27^* * P < 0.05.	16.89^ P < 0.01.	21.18^**	32.84
Population densities of lettuce (D)	3	20.35^**	1.36^ns	5.14^**	27.03
A x D	9	2.06^ns	1.89^ns	1.81^ns	2.24^*
Regression (Response surface)	2	19.10^**	44.89^**	16.36^**	34.38^**
Error	13	0.00025	0.00060	0.03894	0.27112
CV (%)		6.08	1.08	8.56	8.43

Sources of variation	Degree of freedom	Titratable Acidity	pH	Betalaine content	Soluble solids	SS/TA ratio
Blocks	3	0.78ns	0.75^ns	1.11^ns	1.48^ns	1.46^ns
Amounts of M. aegyptia and C. procera biomass (A)	3	1.95^ns	1.41^ns	1.95^ns	2.81^ns	4.73^ P < 0.01.
Population densities of lettuce (D)	3	2.66^ns	3.86^* * P < 0.05.	0.06^ns	4.81^**	5.43^**
A x D	9	1.95^ns	1.21^ns	2.90^**	1.89^ns	4.70^**
Regression (Response surface)	2	15.91^**	24.17^**	23.34^**	4.77^*	4.69^*
Error	13	0.00030	0.00031	5.22580	0.57479	2.21447
CV (%)		12.97	5.16	24.58	13.04	15.66

Sources of variation	Degree of freedom	L*	a*	b*
Blocks	3	1.53ns	0.14^ns	1.53^ns
Amounts of M. aegyptia and C. procera biomass (A)	3	0.34^ns	1.38^ns	0.34^ns
Population densities of lettuce (D)	3	0.52^ns	4.77^ P < 0.01.	0.52^ns
A x D	9	1.30^ns	2.31^* * P < 0.05.	1.30^ns
Regression (Response surface)	2	8.39^**	6.73^**	6.47^*
Error	13	0.41784	0.79615	0.35432
CV (%)		7.94	4.51	7.95

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[1] *Corresponding author: ntnguerra@gmail.com