Performance of low carbon intensified agriculture farm in the Brazilian Savanna by means of univariate and multivariate approaches

Freitas, Antonio Carlos Reis de; Souza, Geraldo da Silva e; Gomes, Eliane Gonçalves; Costa, Falberni de Souza; Klepker, Dirceu

doi:10.1590/1983-40632022v5272425

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Pesquisa Agropecuária Tropical

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Special Supplement: Climate Change in Agriculture • Pesq. Agropec. Trop., Goiânia 52 • 2022 • https://doi.org/10.1590/1983-40632022v5272425 copy

Performance of low carbon intensified agriculture farm in the Brazilian Savanna by means of univariate and multivariate approaches

Desempenho de fazenda de agricultura intensificada de baixo carbono no Cerrado brasileiro por meio de abordagens univariadas e multivariadas

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The low-carbon agriculture is one of the central themes in the climate agenda. This study aimed to evaluate the performance of a low carbon farm in the Maranhão State, Brazil, using univariate and multidimensional approaches. The experimental design consisted of three replications of five treatments (land uses) (Cerrado as a reference area; no-tillage soybean-off-season corn; no-tillage corn-soybean-off-season corn; no-tillage corn-soybean; no-tillage soybean-off-season corn-Brachiarya brizantha), in five periods (Julian days: 28, 48, 83, 138 and 154), totaling 75 observations. The data were analyzed using univariate and multidimensional approaches. A statistically significant interaction was observed between treatment and period, indicating that the responses to the treatment vary with time. The plot that showed the best performance was the reference area, followed by the no-tillage soybean-off-season corn treatment.

KEYWORDS
Greenhouse gases; sustainable land use; carbon sequestration; carbon modeling

Source	DF	Types I and III SS	Mean square	F value	Pr > F
Replications (R)	2	0.0435	0.0217	0.89	0.4177
Treatments (T)	4	0.6807	0.1702	6.93	0.0001
R * T	8	0.4461	0.0558	2.27	0.0343
Time_c	1	0.2346	0.2346	9.56	0.0030

Parameter	Estimate	Standard error	t value	Pr > \|t\|
time_c	-0.0324	0.0105	-3.09	0.0030

Source	Coefficient	Robust standard error	z	P > z
D1	-0.3363	0.3049	-1.10	0.270
D2	-0.4130	0.2503	-1.65	0.099
T1	4.2081	0.1715	24.54	0.000
T2	0.1447	0.2030	0.71	0.476
T3	-0.9220	0.1813	-5.08	0.000
T4	-0.8740	0.3041	-2.87	0.004
D1T1	-4.3412	0.3566	-12.18	0.000
D1T2	0.0645	0.4027	0.16	0.873
D1T3	0.7611	0.3812	2.00	0.046
D1T4	0.6575	0.5068	1.30	0.194
D2T1	-3.3822	0.2948	-11.47	0.000
D2T2	0.4082	0.3024	1.35	0.177
D2T3	1.2718	0.3356	3.79	0.000
D2T4	0.5239	0.4466	1.17	0.241
Time_c	-0.1186	0.0320	-3.70	0.000
Constant	1.4581	0.1762	8.28	0.000

Source	DF	Type III SS	Mean square	F value	Pr > F
Treatment	4	0.6807	0.1702	11.30	< 0.0001
Replication (treatment)	10	0.4896	0.0490	3.25	0.0037
Time	4	0.4044	0.1011	6.71	0.0003
Treatment * time	16	0.6756	0.0422	2.80	0.0042

Source	Type III expected mean square
Treatment	Var(error) + 5 var[rep(treat)] + Q(treat, treat * time)
Replication (treatment)	Var(error) + 5 var[rep(treat)]
Time	Var(error) + Q(time, treat * time)
Treatment * time	Var(error) + Q(treat * time)

Source	DF	Type III SS	Mean square	F value	Pr > F
Treatment^* * This test assumes that one or more other fixed effects are zero.	4	0.6807	0.1702	3.48	0.0501
Replication (treatment)	10	0.4896	0.0490	3.25	0.0037
Time^* * This test assumes that one or more other fixed effects are zero.	4	0.4044	0.1011	6.71	0.0003
Treatment^* * This test assumes that one or more other fixed effects are zero. time	16	0.6756	0.0422	2.80	0.0042
Error: mean square	40	0.6026	0.0151	-	-

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Acompanhe os números deste periódico no seu leitor de RSS

[TFN1] T1: Cerrado as a reference area; T2: no-tillage soybean-off-season corn; T3: no-tillage corn-soybean-off-season corn; T4: no-tillage corn-soybean; T5: no-tillage soybean-off-season corn-Brachiarya brizantha.