Nutritional content of pastures with phosphate fertilization in 2 calcareous soils

Caballero, Enrique M. C.; Durango, Elisa M. P.; Pérez-Polo, Dairo J.

doi:10.1590/1983-21252023v36n110rc

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Agronomy • Rev. Caatinga 36 (1) • Jan-Mar 2023 • https://doi.org/10.1590/1983-21252023v36n110rc copy

Nutritional content of pastures with phosphate fertilization in 2 calcareous soils

Conteúdo nutricional de pastagem com adubacao fosftada em solos calcários

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Alkaline soils present large amounts of calcium carbonates, with precipitation of insoluble calcium phosphate. The objective of the research was to determine the effects of the P application on the nutrient levels of the foliar tissue of Pennisetum pastures in calcareous soils in Córdoba-Colombia. Soil samples were collected from two locations in the Department of Córdoba. A completely randomized design with a 2 x 3 x 6 factorial arrangement (Vista Hermosa and Carolina), there Pennisetum species (king grass, Cuba OM-22, and Pennisetum purpureum), and six P doses (0, 80, 150, 250, 400, and 650 kg ha^-1), applied as P₂O₅, was used. The addition of P did not increase the contents of N, K, Ca, and Mg in the king grass, Pennisetum purpureum, and Cuba OM-22 pastures. However, in the calcareous soils of Carolina, king grass, Pennisetum purpureum, and Cuba, OM-22 absorbed higher amounts of P.

Keywords:
Alkaline soils; Foliar analysis; Insoluble compounds; Phosphorus precipitation; Grasses; Nutrition mineral

Soils	pH	M.O	S	P	Ca	Mg	K	Na	CIC	Cu	Fe	Zn	Mn	Texture
	1:1	%	mg kg^-1		cmol_c kg-¹					mg kg^-1
Vista hermosa-Montería	7.7	2.1	17.6	19.7	30.6	5.6	1.1	0.2	37.6	0.3	0.4	0.3	6.4	clayey soil
Carolina-Planeta Rica	7.3	1.8	24.8	18.5	62.4	10.4	0.6	0.3	73.8	0.1	3.4	0.1	1.0	clayey soil

Fuente	GL	N		P		K		Ca		Mg
Fuente	GL	F	p-valor	F	p-valor	F	p-valor	F	p-valor	F	p-valor
Soil (S)	1	62	<0.01***	76.5	<0.01***	0.52	0.47	54.6	<0.01***	4.43	0.04*
Grass (G)	2	15	<0.01***	33.5	<0.01***	419.75	<0.01***	13.27	<0.01***	0.37	0.69
Phosphorus dose (D)	5	25	<0.01***	37.5	<0.01***	52.96	<0.01***	35.84	<0.01***	2.00	0.08°
Interaction S-G	2	2	0.14	7.0	<0.01***	401.29	<0.01***	17.58	<0.01***	5.00	<0.01***
Interaction S-D	5	2	0.08°	5.5	<0.01***	2.05	0.08°	1.31	0.26	3.90	<0.01***
Interaction G-D	10	6	<0.01***	1.0	0.45	5.77	<0.01***	1.94	0.05*	2.77	<0.01***
Interaction S-G-D	10	1	0.45	1.5	0.15	2.91	<0.01***	2.07	0.03*	2.30	0.02*
Residuals	108
CV(%)		8.45		26.49		13.85		20.64		14.91

Soils	Grass	N	K	Ca	Mg
Vista Hermosa	King Grass	-0.86*	-0.91**	-0.84*	-0.70
	Pennisetum purpureum	-0.94**	-0.94**	-0.98**	-0.26
	Cuba OM-22	-0.93**	-0.92**	-0.90*	-0.96**
Carolina	King Grass	-0.69	-0.95**	-0.60	-0.87*
	Pennisetum purpureum	-0.97**	-0.83*	-0.83*	-0.57
	Cuba OM-22	-0.07	-0.64	-0.64	-0.74°

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[1] *Corresponding author: <emcombatt@correo.unicordoba.edu.co>