MACHINE TRAFFIC AND SOIL PENETRATION RESISTANCE IN GUAVA TREE ORCHARDS

Souza, Wilson José Oliveira de; Rozane, Danilo Eduardo; Souza, Henrique Antunes de; Natale, William; Santos, Paulo André Fernandes dos

doi:10.1590/1983-21252018v31n421rc

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ENGENHARIA AGRÍCOLA • Rev. Caatinga 31 (04) • Oct-Dec 2018 • https://doi.org/10.1590/1983-21252018v31n421rc copy

MACHINE TRAFFIC AND SOIL PENETRATION RESISTANCE IN GUAVA TREE ORCHARDS

TRÂNSITO DE MÁQUINAS E RESISTÊNCIA DO SOLO À PENETRAÇÃO EM POMAR DE GOIABEIRAS

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The study was conducted in irrigated commercial orchards of ‘Paluma’ and ‘Pedro Sato’ guavas, which were mapped with a Garmin GPS unit (Cx60). Sixty five sampling points were marked on a 21 x 21 m sampling grid. Gravimetric humidity and soil penetration resistance (SPR) were evaluated with the help of an automated penetrometer rod with a type 3 cone at a 45º angle (maximum SPR 15,100 kPa). Data with non-normal distribution were analyzed by geostatistics and interpolation by ordinary kriging. SPR values were higher where machine traffic occurs than on the lines where the crop is planted. There was spatial variability of the SPR among the layers evaluated, with the layer between 0.10-0.20 m, on the line of the machine traffic, presenting a higher SPR (>4000 kPa).

Keywords:
Psidium guajava L.; Precision agriculture; Soil compacting; Mechanized agriculture

DSD - DEGREE OF SPATIAL DEPENDENCE
Value	STRONG	MODERATE	WEAK	INDEPENDENT
Interpretation	≤ 0.25	0.25 < DSD ≤ 0.75	0.75<DSD< 1.0	= 1.0
Significance	nugget effect less	nugget effect	relationship between nugget	Relationship between
	than or equal to	represents between	effect and landing is between	nugget effect and landing
	25% of the landing	25% and 75% of the	75% and 100%	equal to 1. Pure nugget
		landing		effect

Depth (m)	n-1	Mean	E	Median	S	KS	pr< KS	Sr
culture line (not compacted)
0-0.10	64	737.23	40.61	694.36	327.43	0.7096	0.0508	ns
0.10-0.20	64	1673.50	93.58	1681.80	754.45	0.1028	0.0851	ns
0.20-0.30	64	1879.47	121.56	1694.70	980.09	0.1258	0.0123	*
0.30-0.40	64	1372.41	87.45	1199.10	705.01	0.1275	0.0104	*
transit line (compacted)
0-0.10	64	2163.83	76.18	2071.55	614.22	0.1067	0.0638	ns
0.10-0.20	64	4034.59	104.02	4001.60	838.66	0.1579	0.0004	**
0.20-0.30	64	3331.72	136.89	3370.20	1103.68	0.0902	0.2109	ns
0.30-0.40	64	2095.29	118.49	1915.30	955.32	0.1747	0.0001	**

	Depth (m)
Parameters	0.20-0.30	0.30-0.40	0.10-0.20	0.30-0.40
	Line of culture (not compacted)		Line of traffic (compacted)
Model	Spherical	Spherical	Linear	Exponential
C₀	61000.00	37000.00	748459.16	20000.00
C₀+C	1015000.00	528100.00	748459.16	1098000.00
A₀	25.30	17.80	97.51	2.20
R²	0.613	0.015	< 0.001	0.010
RSS	2.21E¹²	1.49E¹¹	3.77E¹⁰	2.19E¹¹
GDE	0.06	0.07	1.0	0.018

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