PLOT SIZE, NUMBER OF TREATMENTS AND REPLICATES AND EXPERIMENTAL PRECISION IN BUCKWHEAT

FILHO, ALBERTO CARGNELUTTI; NEU, ISMAEL MARIO MÁRCIO; SOUZA, JÉSSICA MARONEZ DE; PEZZINI, RAFAEL VIEIRA; DUMKE, GABRIEL ELIAS; SOMAVILLA, FELIPE MANFIO

doi:10.1590/1983-21252020v33n428rc

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Zootechnics • Rev. Caatinga 33 (4) • Oct-Dec 2020 • https://doi.org/10.1590/1983-21252020v33n428rc copy

PLOT SIZE, NUMBER OF TREATMENTS AND REPLICATES AND EXPERIMENTAL PRECISION IN BUCKWHEAT

TAMANHO DE PARCELA, NÚMEROS DE TRATAMENTOS E DE REPETIÇÕES E A PRECISÃO EXPERIMENTAL EM TRIGO MOURISCO

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The objective of this work was to determine the optimal plot size to evaluate the fresh weight in buckwheat (Fagopyrum esculentum Moench) of the IPR91-Baili and IPR92-Altar cultivars, in scenarios formed by combinations of numbers of treatments, numbers of replicates, and levels of experimental precision. Sixteen uniformity trials (blank experiments) were carried out, eight with cultivar IPR91-Baili and eight with cultivar IPR92-Altar. The trials were performed in eight sowing dates. The fresh weight was evaluated in 576 basic experimental units (BEU) of 1 m x 1 m (36 BEU per trial). The soil heterogeneity index of Smith (1938) was estimated. The plot size was determined by the method of Hatheway (1961) in scenarios formed by combinations of i treatments (i = 5, 10, 15, and 20), r replicates (r = 3, 4, 5, 6, 7, and 8), and d precision levels (d = 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, and 20%). To evaluate the fresh weight in buckwheat of the IPR91-Baili and IPR92-Altar cultivars, in experiments under completely randomized and randomized block designs, with 5 to 20 treatments and eight replicates, plots of 8 m³of useful area are sufficient to identify significant differences between treatments, at 5% probability level, of 15% of the overall mean of the experiment.

Keywords:
Fagopyrum esculentum Moench; Soil cover crop; Uniformity trial; Experimental design.

Trial	Sowing	Evaluation	DAS	FW, in g m^-2	CV, in %	DW content, in %	DW, in g m^-2
IPR91-Baili cultivar (n = 8 uniformity trials)
1	12/18/2017	02/15/2018	59	3336	19.37	15.14	505
2	01/03/2018	03/14/2018	70	3105	14.19	19.03	591
3	03/14/2018	05/10/2018	57	901	26.84	14.83	134
4	11/06/2018	12/27/2018	51	1227	30.53	14.42	177
5	12/28/2018	02/14/2019	48	1397	17.17	18.56	259
6	01/30/2019	04/03/2019	63	2470	23.17	20.86	515
7	02/22/2019	04/15/2019	52	2067	16.30	25.77	533
8	03/28/2019	05/20/2019	53	459	41.40	23.30	107
Minimum				459	14.19	14.42	107
Maximum				3336	41.40	25.77	591
Mean				1870 a	23.62 a	18.99 a	353 a
IPR92-Altar cultivar (n = 8 uniformity trials)
1	12/18/2017	02/15/2018	59	3253	17.53	15.08	490
2	01/03/2018	03/14/2018	70	3311	21.26	16.82	557
3	03/14/2018	05/10/2018	57	1009	23.41	17.24	174
4	11/06/2018	12/27/2018	51	1245	33.59	16.19	202
5	12/28/2018	02/14/2019	48	621	32.57	15.91	99
6	01/30/2019	04/03/2019	63	2635	24.81	18.31	482
7	02/22/2019	04/15/2019	52	2117	20.97	23.36	494
8	03/28/2019	05/20/2019	53	474	29.96	19.46	92
Minimum				474	17.53	15.08	92
Maximum				3311	33.59	23.36	557
Mean				1833 a	25.51 a	17.80 a	324 a
Overall (n= 16 uniformity trials)
Minimum				459	14.19	14.42	92
Maximum				3336	41.40	25.77	591
Mean				1852	24.57	18.39	338

d (%)	i = 5 treatments						i = 10 treatments						i = 15 treatments						i = 20 treatments
d (%)	r=3	r=4	r=5	r=6	r=7	r=8	r=3	r=4	r=5	r=6	r=7	r=8	r=3	r=4	r=5	r=6	r=7	r=8	r=3	r=4	r=5	r=6	r=7	r=8
CRD - IPR91-Baili (b = 0.8207; CV = 23.62%)
10	79	51	38	29	24	20	69	47	35	28	23	20	67	46	35	28	23	19	65	45	34	27	23	19
11	63	41	30	23	19	16	55	37	28	22	18	16	53	36	28	22	18	15	52	36	27	22	18	15
12	51	33	24	19	16	13	45	30	23	18	15	13	43	30	22	18	15	13	42	29	22	18	15	13
13	42	27	20	16	13	11	37	25	19	15	12	11	35	24	18	15	12	10	35	24	18	15	12	10
14	35	23	17	13	11	9	31	21	16	13	10	9	30	20	16	12	10	9	29	20	15	12	10	9
15	30	19	14	11	9	8	26	18	13	11	9	8	25	17	13	11	9	8	25	17	13	10	9	7
16	25	17	12	10	8	7	22	15	12	9	8	7	22	15	11	9	8	7	21	15	11	9	8	6
17	22	14	11	8	7	6	19	13	10	8	7	6	19	13	10	8	7	6	18	13	10	8	7	6
18	19	13	9	7	6	5	17	12	9	7	6	5	16	11	9	7	6	5	16	11	9	7	6	5
19	17	11	8	7	5	5	15	10	8	6	5	4	14	10	8	6	5	4	14	10	8	6	5	4
20	15	10	7	6	5	4	13	9	7	6	5	4	13	9	7	5	5	4	12	9	7	5	5	4
RCBD - IPR91-Baili (b = 0.8207; CV = 23.62%)
10	85	53	39	30	25	21	70	48	36	28	23	20	67	46	35	28	23	19	66	45	34	27	23	19
11	67	42	31	24	20	16	56	38	28	22	19	16	53	37	28	22	18	15	52	36	27	22	18	15
12	54	34	25	20	16	13	45	31	23	18	15	13	43	30	22	18	15	13	42	29	22	18	15	13
13	45	28	21	16	13	11	37	25	19	15	12	11	36	25	19	15	12	10	35	24	18	15	12	10
14	38	24	17	14	11	9	31	21	16	13	11	9	30	21	16	12	10	9	29	20	15	12	10	9
15	32	20	15	12	9	8	27	18	14	11	9	8	25	17	13	11	9	8	25	17	13	11	9	7
16	27	17	13	10	8	7	23	15	12	9	8	7	22	15	11	9	8	7	21	15	11	9	8	6
17	24	15	11	9	7	6	20	13	10	8	7	6	19	13	10	8	7	6	18	13	10	8	7	6
18	21	13	10	8	6	5	17	12	9	7	6	5	16	11	9	7	6	5	16	11	9	7	6	5
19	18	12	8	7	6	5	15	10	8	6	5	5	14	10	8	6	5	4	14	10	8	6	5	4
20	16	10	8	6	5	4	13	9	7	6	5	4	13	9	7	6	5	4	13	9	7	5	5	4
CRD - IPR92-Altar (b = 0.9536; CV = 25.51%)
10	51	35	27	22	18	16	45	33	25	21	18	15	44	32	25	21	18	15	43	31	25	20	17	15
11	42	29	22	18	15	13	37	27	21	17	15	13	36	26	21	17	14	13	35	26	20	17	14	13
12	35	24	18	15	13	11	31	22	18	14	12	11	30	22	17	14	12	11	30	22	17	14	12	11
13	29	20	16	13	11	9	26	19	15	12	10	9	25	19	15	12	10	9	25	18	15	12	10	9
14	25	18	13	11	9	8	23	16	13	11	9	8	22	16	13	10	9	8	22	16	12	10	9	8
15	22	15	12	10	8	7	20	14	11	9	8	7	19	14	11	9	8	7	19	14	11	9	8	7
16	19	13	10	8	7	6	17	12	10	8	7	6	17	12	10	8	7	6	16	12	10	8	7	6
17	17	12	9	7	6	6	15	11	9	7	6	5	15	11	9	7	6	5	14	11	8	7	6	5
18	15	11	8	7	6	5	14	10	8	6	6	5	13	10	8	6	5	5	13	10	8	6	5	5
19	14	9	7	6	5	4	12	9	7	6	5	4	12	9	7	6	5	4	12	9	7	6	5	4
20	12	9	7	5	5	4	11	8	6	5	5	4	11	8	6	5	4	4	10	8	6	5	4	4
RCBD - IPR92-Altar (b = 0.9536; CV = 25.51%)
10	54	36	28	22	19	16	46	33	26	21	18	15	44	32	25	21	18	15	43	32	25	20	17	15
11	44	30	23	18	15	13	38	27	21	17	15	13	36	26	21	17	14	13	35	26	20	17	14	13
12	37	25	19	15	13	11	32	23	18	14	12	11	30	22	17	14	12	11	30	22	17	14	12	11
13	31	21	16	13	11	9	27	19	15	12	10	9	26	19	15	12	10	9	25	18	15	12	10	9
14	27	18	14	11	9	8	23	16	13	11	9	8	22	16	13	10	9	8	22	16	13	10	9	8
15	23	16	12	10	8	7	20	14	11	9	8	7	19	14	11	9	8	7	19	14	11	9	8	7
16	20	14	11	9	7	6	17	13	10	8	7	6	17	12	10	8	7	6	16	12	10	8	7	6
17	18	12	9	8	6	6	15	11	9	7	6	5	15	11	9	7	6	5	15	11	8	7	6	5
18	16	11	8	7	6	5	14	10	8	6	6	5	13	10	8	6	5	5	13	10	8	6	5	5
19	14	10	8	6	5	5	12	9	7	6	5	4	12	9	7	6	5	4	12	9	7	6	5	4
20	13	9	7	6	5	4	11	8	6	5	5	4	11	8	6	5	4	4	10	8	6	5	4	4

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