Evaluation of models to estimate the actual evapotranspiration of soybean crop subjected to different water deficit conditions

ALVES, ÉLVIS DA S.; RODRIGUES, LINEU N.; CUNHA, FERNANDO F.; FARIAS, DIEGO B.S.

doi:10.1590/0001-3765202120201801

Acessibilidade / Reportar erro

Brasil

Anais da Academia Brasileira de Ciências

Español English

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

CROP SCIENCE • An. Acad. Bras. Ciênc. 93 (4) • 2021 • https://doi.org/10.1590/0001-3765202120201801 copy

Evaluation of models to estimate the actual evapotranspiration of soybean crop subjected to different water deficit conditions

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Optimization of water use for irrigation will only be possible with the adjustment of management, which is directly related to the correct estimate of the actual evapotranspiration of the crop. The present study aimed to evaluate different mathematical approaches used in estimating the actual evapotranspiration of a new soybean cultivar (BRS 7581RR) subjected to different water deficit conditions. For this, the ETa estimated by the FAO56 Dual, Jensen and Hermann, AquaCrop and Ritchie models was evaluated. The experimental design was randomized with five treatments and four replicates. Irrigation management in the treatments was conducted so as to maintain different levels of water available in the soil (AW). The T1 treatment was performed applying 80 to 100% AW; in T2 treatment, the allowed variation was 60 to 80% AW; in T3 treatment, it was 40 to 60% AW; in T4, from 20 to 40% AW; and in T5, from 0 to 20% AW. The results showed that the FAO56 Dual model showed better performance in soybean ETa estimation for winter conditions in most treatments, with NSE ranging from 0.42 to 0.83. In the summer, the Jensen and Hermann model showed the best results, with NSE ranging from 0.70 to 0.94.

Key words
Cerrado; modeling; irrigation management; water resources

Coef	Winter experiment					Summer experiment
Coef	T1	T2	T3	T4	T5	T1	T2	T3	T4	T5
α	36,85	33,53	29,83	25,28	20,39	43,96	40,76	38,33	31,47	27,23
b	15,75	15,77	14,60	12,59	11,56	25,27	24,64	24,80	26,97	27,77
Xo	36,11	36,95	38,75	38,33	39,51	39,60	39,93	41,95	44,58	45,64

Coef	Winter experiment					Summer experiment
Coef	T1	T2	T3	T4	T5	T1	T2	T3	T4	T5
α	4,54	4,20	3,70	2,63	2,17	7,90	7,44	6,60	5,66	4,53
b	19,05	18,71	18,88	19,51	20,07	22,24	21,69	21,82	21,20	21,19
Xo	72,4	72,6	72,3	71,6	70,6	74,1	74,1	74,6	73,6	73,5

Treatment	Model	winter			summer
Treatment	Model	NSE	RMSE	MBE	NSE	RMSE	MBE
T1	ETa_DUAL	0,67	0,27	-0,17	0,62	0,93	0,51
	ETa_JEN	-0,61	0,91	-0,75	0,84	0,53	-0,43
	ETa_ACRP	-1,25	0,65	-0,54	0,73	0,80	0,27
	ETa_RIT	-0,10	0,54	-0,16	0,51	0,91	-0,09
T2	ETa_DUAL	0,83	0,20	0,00	0,54	1,01	0,63
	ETa_JEN	-0,03	0,71	-0,57	0,92	0,37	-0,27
	ETa_ACRP	-1,50	0,65	-0,56	0,76	0,68	0,14
	ETa_RIT	0,20	0,51	-0,05	0,61	0,77	0,00
T3	ETa_DUAL	0,60	0,29	0,17	0,33	1,19	0,87
	ETa_JEN	0,38	0,53	-0,36	0,94	0,31	0,00
	ETa_ACRP	-0,10	0,47	-0,36	0,65	0,80	0,20
	ETa_RIT	0,04	0,60	0,22	0,34	1,06	0,49
T4	ETa_DUAL	0,42	0,33	0,11	0,01	1,41	1,19
	ETa_JEN	0,32	0,46	-0,31	0,87	0,44	0,35
	ETa_ACRP	0,39	0,41	-0,26	0,49	0,95	0,45
	ETa_RIT	-0,19	0,74	0,42	0,09	1,27	0,91
T5	ETa_DUAL	0,16	0,38	0,24	-0,28	1,54	1,36
	ETa_JEN	0,59	0,31	-0,10	0,70	0,62	0,54
	ETa_ACRP	0,26	0,48	-0,22	0,28	1,15	0,57
	ETa_RIT	-0,60	0,95	0,74	-0,11	1,45	1,11

Academia Brasileira de Ciências Rua Anfilófio de Carvalho, 29, 3º andar, 20030-060 Rio de Janeiro RJ Brasil, Tel: +55 21 3907-8100 - Rio de Janeiro - RJ - Brazil
E-mail: aabc@abc.org.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] Correspondence to: Élvis da Silva Alves E-mail: elvistv@gmail.com