WATER AVAILABILITY IN A PLANOSOL UNDER INTEGRATED CROP-LIVESTOCK-FORESTRY SYSTEM IN THE AGRESTE REGION OF PARAIBA, BRAZIL

SILVA, PEDRO LUAN FERREIRA DA; OLIVEIRA, FLÁVIO PEREIRA DE; TAVARES, DANILLO DUTRA; NÓBREGA, CAMILA COSTA DA; AMARAL, ANDRÉ JULIO DO

doi:10.1590/1983-21252019v32n218rc

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Engenharia Agrícola • Rev. Caatinga 32 (2) • Apr-Jun 2019 • https://doi.org/10.1590/1983-21252019v32n218rc copy

WATER AVAILABILITY IN A PLANOSOL UNDER INTEGRATED CROP-LIVESTOCK-FORESTRY SYSTEM IN THE AGRESTE REGION OF PARAIBA, BRAZIL¹ 1 Paper approved from III SINPROVS 2018. Paper extracted from the first author of the Scientific Initiation Project - PIBIC / CNPq.

DISPONIBILIDADE DE ÁGUA EM PLANOSSOLO SOB SISTEMA DE INTEGRAÇÃO LAVOURA-PECUARIA-FLORESTA NO AGRESTE DA PARAIBA

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Integrated agricultural production systems, involving agriculture, livestock, and forest are strategies that improve soil quality. The objective of this work was to evaluate the effect of the integrated crop-livestock-forest system (ICLF) on water availability of a Planosol in the Agreste region of the state of Paraíba (PB), Brazil. The experiment was conducted at the experimental site of the Agricultural Research Company of Paraíba (EMEPA), in Alagoinha, PB. The soil evaluated was a Eutric Planosol, with a moderate A horizon. The following intercrops (treatments) were implemented in June 2015: I. Gliricidia sepium + Brachiaria decumbens; II. Mimosa caesalpiniifolia + Brachiaria decumbens; III. Tabebuia alba + Brachiaria decumbens; IV. Zea mays + Brachiaria decumbens; and V. Brachiaria decumbens. A randomized block experimental design was used, with five treatments. The analyzed variables were field capacity, permanent wilting point, soil available water, granulometry, degree of flocculation, total porosity, macroporosity, microporosity, saturated hydraulic conductivity, resistance to penetration, and aggregate stability index. The results showed that the water availability in the ICLF implemented in the Agreste region of Paraíba had no significant variation after three years. After the three-year period, the ICLF promoted no significant physical improvement in the attributes of the evaluated Planosol.

Keywords:
Water retention; Soil available water; ICLF

Sand	Silt	Clay	CDW	DF	SD	PD	TP	Textural Class
--------g kg^-1--------				---g cm^-3---		m³ m^-3
685	172	143	38	73.4	1.54	2.64	0.42	Sandy loam

pH_(H2O)	P	K⁺	Na⁺	H⁺+Al³⁺	Al⁺³	Ca⁺²	Mg⁺²	SB	CEC	TOC
(1:2.5)	---mg dm^-3---		--------------cmol_c dm^-3--------------							g kg^-1
5.7	6.98	194.00	0.03	4.46	0.00	2.71	1.17	4.41	8.87	9.10

Treatment	Granulometry			Degree of flocculation
	Sand	Silt	Clay
	------g kg^-1------
	0 - 0.10 m
GS+BD	703 a	139 a	158 a	904 a
MC+BD	686 a	152 a	162 a	919 a
TA+BD	694 a	143 a	163 a	972 a
ZM+BD	683 a	156 a	162 a	884 a
BD	681 a	152 a	167 a	819 a
CV %	7.72	14.03	22.66	8.44
	0.10 - 0.20 m
GS+BD	696 a	144 a	160 a	816 a
MC+BD	692 a	142 a	166 a	842 a
TA+BD	676 a	147 a	177 a	813 a
ZM+BD	695 a	136 a	169 a	862 a
BD	650 a	160 a	190 a	861 a
CV %	7.95	13.51	21.29	9.38

Treatment	SD	α	Ma	Mi	K_θ	Rp
	kg dm^-3	------m³ m^-3------			cm h^-1	MPa
	0 - 0.10 m
GS+BD	1.24 a	0.44 a	0.16 a	0.28 a	6.05 a	0.13 a
MC+BD	1.28 a	0.47 a	0.16 a	0.31 a	13.37 a	0.14 a
TA+BD	1.27 a	0.45 a	0.15 a	0.30 a	4.36 a	0.16 a
ZM+BD	1.30 a	0.47 a	0.15 a	0.32 a	6.89 a	0.14 a
BD	1.27 a	0.46 a	0.15 a	0.31 a	4.32 a	0.15 a
CV %	6.78	6.68	21.29	11.56	157.58	59.81
	0. 10 - 0.20 m
GS+BD	1.39 a	0.43 a	0.13 a	0.30 a	2.20 a	0.30 a
MC+BD	1.38 a	0.45 a	0.14 a	0.31 a	3.80 a	0.21 a
TA+BD	1.38 a	0.44 a	0.13 a	0.31 a	1.00 a	0.21 a
ZM+BD	1.38 a	0.43 a	0.13 a	0.30 a	4.10 a	0.29 a
BD	1.39 a	0.44 a	0.13 a	0.31 a	1.70 a	0.25 a
CV %	4.74	4.78	18.61	5.03	154.68	39.02

Treatment	WMDda	WMDwa	AEI	TOC
	---------mm---------			g kg^-1
	0 - 0.10 m
GS+BD	1.98 a	1.20 a	0.61 a	13.80 a
MC+BD	2.28 a	1.36 a	0.59 a	15.63 a
TA+BD	2.55 a	1.64 a	0.64 a	15.93 a
ZM+BD	2.31 a	1.16 a	0.52 a	16.59 a
BD	2.23 a	1.32 a	0.59 a	15.99 a
CV %	23.89	24.88	12.16	16.08
	0.10 - 0.20 m
GS+BD	2.83 a	1.08 a	0.39 a	12.98 a
MC+BD	2.63 a	1.10 a	0.42 a	12.75 a
TA+BD	2.59 a	1.45 a	0.59 a	14.21 a
ZM+BD	2.46 a	0.95 a	0.39 a	13.62 a
BD	2.72 a	1.41 a	0.52 a	14.85 a
CV %	13.37	17.88	19.96	16.08

Treatment	θFC	θPWP	θAW
	------m³ m^-3------
	0 - 0.10 m
GS+BD	0.560 a	0.157 a	0.403 a
MC+BD	0.562 a	0.159 a	0.403 a
TA+BD	0.561 a	0.169 a	0.392 a
ZM+BD	0.513 a	0.173 a	0.340 a
BD	0.509 a	0.176 a	0.333 a
CV %	39.12	88.54	15.30
	0.10 - 0.20 m
GS+BD	0.565 a	0.163 a	0.402 a
MC+BD	0.568 a	0.159 a	0.409 a
TA+BD	0.580 a	0.169 a	0.411 a
ZM+BD	0.636 a	0.173 a	0.463 a
BD	0.635 a	0.176 a	0.459 a
CV %	36.38	84.05	16.07

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[1] ^* Corresponding author: pereira@cca.ufpb.br

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WATER AVAILABILITY IN A PLANOSOL UNDER INTEGRATED CROP-LIVESTOCK-FORESTRY SYSTEM IN THE AGRESTE REGION OF PARAIBA, BRAZIL1 1 Paper approved from III SINPROVS 2018. Paper extracted from the first author of the Scientific Initiation Project - PIBIC / CNPq.

DISPONIBILIDADE DE ÁGUA EM PLANOSSOLO SOB SISTEMA DE INTEGRAÇÃO LAVOURA-PECUARIA-FLORESTA NO AGRESTE DA PARAIBA

ABSTRACT

WATER AVAILABILITY IN A PLANOSOL UNDER INTEGRATED CROP-LIVESTOCK-FORESTRY SYSTEM IN THE AGRESTE REGION OF PARAIBA, BRAZIL¹ 1 Paper approved from III SINPROVS 2018. Paper extracted from the first author of the Scientific Initiation Project - PIBIC / CNPq.