METHODS FOR ESTIMATING THE OPTIMAL PLOT SIZE FOR BLACK OAT, COMMON VETCH AND FORAGE TURNIP INTERCROPPING<sup/>

CARGNELUTTI FILHO, ALBERTO; NEU, ISMAEL MARIO MÁRCIO; BUBANS, VALÉRIA ESCAIO; SOMAVILLA, FELIPE MANFIO; OSMARI, BRUNO FILLIPIN

doi:10.1590/1983-21252022v35n425rc

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Technical Note • Rev. Caatinga 35 (4) • Oct-Dec 2022 • https://doi.org/10.1590/1983-21252022v35n425rc copy

METHODS FOR ESTIMATING THE OPTIMAL PLOT SIZE FOR BLACK OAT, COMMON VETCH AND FORAGE TURNIP INTERCROPPING¹ 1 Paper of the Experimentation Research Group.

MÉTODOS DE ESTIMAÇÃO DO TAMANHO ÓTIMO DE PARCELA EM AVEIA PRETA, ERVILHACA E NABO FORRAGEIRO CULTIVADAS EM CONSÓRCIO

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The objective of this work was to compare three methods of estimating the optimal plot size to evaluate the fresh matter in black oat (Avena strigosa Schreb), common vetch (Vicia sativa L.) and forage turnip (Raphanus sativus L.) intercropping. Six uniformity trials with black oat, common vetch and forage turnip intercropping were carried out. Three trials were evaluated at 84 days after sowing and the other three trials at 119 days after sowing. The fresh matter was evaluated in 216 basic experimental units (36 per trial) of 1 m × 1 m. The optimal plot size was determined using the methods of modified maximum curvature, linear response and plateau model and quadratic response and plateau model. The optimal plot size differs between the methods and decreases in the following order: quadratic response and plateau model (15.13 m²), linear response and plateau model (8.24 m²) and modified maximum curvature (5.62 m²). The optimal plot size for assessing the fresh matter of black oat, common vetch and forage turnip, grown in intercropping, is 15.13 m². This size can be used as a reference for future experiments.

Keywords
Avena strigosa Schreb; Vicia sativa L; Raphanus sativus L; Uniformity trial; Experiment planning.

X_R	X_C	X	n	M(X)	CV(X)	M(X)	CV(X)	M(X)	CV(X)
				Evaluation at 84 days after sowing
				Trial 1⁽¹⁾		Trial 2		Trial 3
1	1	1	36	3367	28.77	2953	29.24	2656	25.22
1	2	2	18	6735	23.43	5907	22.13	5312	18.31
1	3	3	12	10102	14.13	8860	15.61	7968	13.53
1	6	6	6	20204	12.22	17721	12.68	15936	11.02
2	1	2	18	6735	24.88	5907	23.48	5312	21.86
2	2	4	9	13469	19.63	11814	17.15	10624	14.32
2	3	6	6	20204	6.16	17721	6.49	15936	12.72
2	6	12	3	40408	5.60	35442	6.14	31871	11.52
3	1	3	12	10102	23.25	8860	24.24	7968	18.86
3	2	6	6	20204	18.16	17721	18.51	15936	9.31
3	3	9	4	30306	3.59	26581	7.47	23903	7.78
3	6	18	2	60613	3.84	53163	8.59	47807	1.13
6	1	6	6	20204	22.83	17721	23.45	15936	17.07
6	2	12	3	40408	18.30	35442	18.16	31871	4.32
6	3	18	2	60613	2.15	53163	3.04	47807	8.14
				Evaluation at 119 days after sowing
				Trial 1		Trial 2		Trial 3
1	1	1	36	2860	30.68	3134	27.74	3267	30.39
1	2	2	18	5721	23.25	6267	19.14	6534	20.76
1	3	3	12	8581	18.66	9401	10.20	9801	22.11
1	6	6	6	17163	17.90	18801	5.63	19601	18.32
2	1	2	18	5721	26.49	6267	19.09	6534	24.40
2	2	4	9	11442	21.54	12534	15.37	13067	14.88
2	3	6	6	17163	17.58	18801	7.21	19601	15.79
2	6	12	3	34325	18.63	37603	4.28	39202	12.47
3	1	3	12	8581	25.53	9401	21.34	9801	21.01
3	2	6	6	17163	21.13	18801	18.19	19601	8.54
3	3	9	4	25744	18.30	28202	8.40	29402	13.27
3	6	18	2	51488	20.37	56404	0.23	58803	0.12
6	1	6	6	17163	17.10	18801	9.59	19601	19.77
6	2	12	3	34325	13.85	37603	8.46	39202	6.36
6	3	18	2	51488	2.54	56404	5.38	58803	11.98

Evaluation time	Trial ⁽¹⁾	MMC	LRP	QRP
			Coefficient of determination (R²)
84 DAS	1	0.61	0.65	0.64
84 DAS	2	0.65	0.61	0.61
84 DAS	3	0.74	0.77	0.79
	Mean	0.66 a	0.67 a	0.68 a
119 DAS	1	0.63	0.53	0.56
119 DAS	2	0.66	0.71	0.73
119 DAS	3	0.49	0.69	0.73
	Mean	0.59 a	0.65 a	0.68 a
Overall mean		0.63 A	0.66 A	0.68 A
			Optimal plot size (Xo, m²)
84 DAS	1	6.00	8.30	18.32
84 DAS	2	5.67	8.70	11.83
84 DAS	3	5.27	8.58	14.02
	Mean	5.65 a	8.53 a	14.72 a
119 DAS	1	4.88	7.71	18.61
119 DAS	2	5.78	7.59	11.27
119 DAS	3	6.08	8.58	16.73
	Mean	5.58 a	7.96 a	15.54 a
Overall mean		5.62 C	8.24 B	15.13 A
Coefficient of variation in the optimal plot size (CV_Xo, %)
84 DAS	1	12.05	6.69	4.20
84 DAS	2	13.61	8.68	8.84
84 DAS	3	11.73	6.58	5.80
	Mean	12.46 a	7.32 a	6.28 a
119 DAS	1	19.02	14.74	12.24
119 DAS	2	9.12	5.35	4.98
119 DAS	3	12.62	8.84	6.67
	Mean	13.59 a	9.64 a	7.96 a
Overall mean		13.03 A	8.48 B	7.12 C

Universidade Federal Rural do Semi-Árido Avenida Francisco Mota, número 572, Bairro Presidente Costa e Silva, Cep: 5962-5900, Telefone: 55 (84) 3317-8297 - Mossoró - RN - Brazil
E-mail: caatinga@ufersa.edu.br

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METHODS FOR ESTIMATING THE OPTIMAL PLOT SIZE FOR BLACK OAT, COMMON VETCH AND FORAGE TURNIP INTERCROPPING1 1 Paper of the Experimentation Research Group.

MÉTODOS DE ESTIMAÇÃO DO TAMANHO ÓTIMO DE PARCELA EM AVEIA PRETA, ERVILHACA E NABO FORRAGEIRO CULTIVADAS EM CONSÓRCIO

ABSTRACT

METHODS FOR ESTIMATING THE OPTIMAL PLOT SIZE FOR BLACK OAT, COMMON VETCH AND FORAGE TURNIP INTERCROPPING¹ 1 Paper of the Experimentation Research Group.