Photo-selective nets and potassium concentrations on <i>Costus lasius</i> crop

Sampaio, Pedro R. F.; Rodrigues, Paulo H. V.; Duarte, Sergio N.; Sousa Neto, Osvaldo N. de; Nascimento, Jéssica G.; Piedade, Sônia M. de S.

doi:10.1590/1807-1929/agriambi.v24n3p143-148

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Articles • Rev. bras. eng. agríc. ambient. 24 (3) • Mar 2020 • https://doi.org/10.1590/1807-1929/agriambi.v24n3p143-148 copy

Photo-selective nets and potassium concentrations on Costus lasius crop

Malhas fotoconversoras e concentrações de potássio no cultivo de Costus lasius

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The practice of using different photo-selective nets, associated with the technique of fertigation, represents a new agrotechnological concept that aims to promote specific physiological responses for growth and production, which are regulated by light. The aims of the study were to evaluate the effect of photo-selective nets and potassium concentrations in the fertigation solution on the horticultural performance of Costus lasius. The study was conducted at the Universidade de São Paulo, ESALQ, Piracicaba, SP, Brazil. Three experiments were carried out separately to evaluate five potassium concentrations in the fertigation solution (40, 80, 120, 160 and 200 mg L^-1) under three colours of photo-selective nets (red, blue and black) in a randomized block design, with five repetitions. The variables plant height and numbers of leaves, stems and flower buds were evaluated. The data were submitted to the joint analysis of experiments. The association between the K⁺ concentration of 200 mg L^-1 and the black photo-selective net results in higher stem and inflorescence production.

Key words:
ornamental flowers; potted flowers; fertigation

SV	DF	Mean squares - PH - DAT
SV	DF	60	90	120	150	180	210	240	270	300	330	360	390
Block/Nets	12	31.2	37.7	36.4	24.5	17.2	10.7	7.6	4.8	12.3	7.0	10.7	15.9
Nets	2	29.3*	55.3*	101.7*	109.4*	81.3*	58.2*	16.1*	12.3*	34.2*	44.0*	87.5*	142.1*
K⁺	4	2.5^ns	3.8^ns	7.1^ns	11.2^ns	6.9^ns	7.3^ns	0.5^ns	0.9^ns	0.6^ns	1.2^ns	1.2^ns	2.2^ns
Nets × K⁺	8	8.8*	12.9*	8.6^ns	5.8^ns	4.2^ns	5.8^ns	5.2^ns	2.6^ns	7.1^ns	8.5^ns	9.6^ns	5.6^ns
Error	48	3.8	4.7	7.2	6.2	6.0	4.4	4.3	3.2	8.3	7.9	10.1	9.0
Total	74
CV (%)		27.18	25.09	22.96	17.13	13.85	10.42	8.53	6.08	8.01	7.21	7.74	6.89
Nets		Interaction between plant height means (cm)
		60 DAT							90 DAT
		K40	K80	K120	K160	K200			K40	K80	K120	K160	K200
Red		6.82 a	5.43 a	7.17 a	5.97 a	6.22 a			8.06 a	6.20 a	8.15 a	6.83 a	6.95 a
Blue		6.73 a	6.55 a	5.51 a	6.95 a	9.02 a			9.01 ab	8.15 ab	6.90 b	7.67 ab	11.12 a
Black		8.56ab	7.86 ab	8.85 ab	10.35 a	6.54 b			10.87 ab	9.36 ab	10.86 ab	12.07 a	7.88 b
Nets		General average plant height (cm) - DAT
Nets			120	150	180	210	240	270	300	330	360	390
Red			9.6 c	12.4 c	15.6 b	18.4 b	23.8 b	29.6 ab	37.1 a	40.5 a	43.2 a	46.0 a
Blue			11.6 b	14.7 b	18.3 a	20.7 a	25.4 ab	30.5 a	36.0 ab	39.0 ab	40.9 b	43.5 b
Black			13.7 a	16.6 a	19.0 a	21.3 a	24.4 a	29.1 b	34.8 b	37.9 b	39.4 b	41.3 c
Error			1.69	1.58	1.55	1.33	1.33	1.15	1.83	1.79	2.02	1.90

Sources of variation	DF	Mean squares
		Number of leaves - DAT
		60	90	120	150	180	210	240	270	300	330	360	390
Block/Nets	12	4.5	18.7	72.5	97.4	111.3	149.8	177.9	302.2	547.5	694.1	578.7	1434.7
Nets	2	25.4*	135.6*	639.6*	675.6*	905.4*	1084.1*	1031.6*	409.9^ns	1679.5*	2970.8*	3813.8*	4517.7*
Concentrations of K⁺	4	2.2^ns	13.3^ns	56.8^ns	77.5^ns	101.5^ns	117.2^ns	174.4^ns	505.7^ns	1485.3^ns	807.7^ns	1442.8^ns	809.4^ns
Nets × K⁺	8	2.1^ns	4.7^ns	36.7^ns	63.2^ns	77.2^ns	100.7^ns	185.3^ns	443.5^ns	368.3^ns	1120.2^ns	674.1^ns	836.7^ns
Error	48	2.3	9.6	30.7	51.3	79.3	136.2	225.9	369.8	528.2	670.8	730.2	1197.7
Total	74
CV (%)		27.9	35.2	33.6	29.7	26.0	24.3	23.0	20.4	21.8	20.3	19.5	21.3
Nets	Table of averages - DAT
Nets		60	90	120	150	180	210	240	270	300	330	360	390
Red		5.0 b	7.0 b	12.5 b	18.8 b	29.6 b	43.2 b	62.4 ab	94.1 a	103.6 ab	136.3 a	151.1 a	177.9 a
Blue		4.8 b	7.8 b	14.9 b	22.5 b	32.1 b	45.4 b	60.8 b	90.6 a	98.1 b	130.6 ab	126.8 b	154.9 ab
Black		6.6 a	11.4 a	22.1 a	29.9 a	41.1 a	55.6 a	72.6 a	98.6 a	114.2 a	115.2 b	134.8 ab	154.4 b
Error		0.97	1.95	3.51	4.53	5.63	7.38	9.51	12.16	14.54	16.38	16.97	21.87

Sources of variation	DF	Mean squares
Sources of variation	DF	NS	NF
Block/Nets	12	125.01^ns			22.72^ns
Nets	2	839.89*			77.45*
K⁺	4	44.65^ns			78.59*
Nets × K⁺	8	20.14^ns			49.19*
Error	48	93.82			17.98
Total	74
CV (%)		15.43			43.16
Nets		Means
		NS	NF
			40	80	120	160	200
			(mg L^-1)
Red		61.44 b	12.80 a	6.50 a	8.40 a	10.00 a	10.40 b
Blue		57.76 b	7.80 ab	6.00 a	9.20 a	8.00 a	10.20 b
Black		69.12 a	5.40 b	9.60 a	11.00 a	13.20 a	19.40 a

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[1] Pedro R. F. Sampaio - E-mail: prfsampaio@usp.br (Corresponding author)