Nutritional status of cotton plants under fertigation with reuse water and phosphate fertilization

Gonçalo Filho, Francisco; Ferreira Neto, Miguel; Dias, Nildo da S.; Medeiros, José F. de; Fernandes, Cleyton dos S.; Sá, Francisco V. da S.

doi:10.1590/1807-1929/agriambi.v24n9p603-609

Francisco Gonçalo Filho

Universidade Federal Rural do Semi-Árido/Centro de Ciências Agrárias. Mossoró, RN, Brasil. E-mail: goncalofilho.rn@gmail.com (Corresponding author); miguel@ufersa.edu.br; nildo@ufersa.edu.br; jfmedeir@ufersa.edu.br; cleyton1959@hotmail.com; vanies_agronomia@hotmail.com

https://orcid.org/0000-0001-9335-6863

Miguel Ferreira Neto

Universidade Federal Rural do Semi-Árido/Centro de Ciências Agrárias. Mossoró, RN, Brasil. E-mail: goncalofilho.rn@gmail.com (Corresponding author); miguel@ufersa.edu.br; nildo@ufersa.edu.br; jfmedeir@ufersa.edu.br; cleyton1959@hotmail.com; vanies_agronomia@hotmail.com

https://orcid.org/0000-0002-5128-8230

Nildo da S. Dias

Universidade Federal Rural do Semi-Árido/Centro de Ciências Agrárias. Mossoró, RN, Brasil. E-mail: goncalofilho.rn@gmail.com (Corresponding author); miguel@ufersa.edu.br; nildo@ufersa.edu.br; jfmedeir@ufersa.edu.br; cleyton1959@hotmail.com; vanies_agronomia@hotmail.com

https://orcid.org/0000-0002-1276-5444

José F. de Medeiros

Universidade Federal Rural do Semi-Árido/Centro de Ciências Agrárias. Mossoró, RN, Brasil. E-mail: goncalofilho.rn@gmail.com (Corresponding author); miguel@ufersa.edu.br; nildo@ufersa.edu.br; jfmedeir@ufersa.edu.br; cleyton1959@hotmail.com; vanies_agronomia@hotmail.com

https://orcid.org/0000-0003-1202-8783

Cleyton dos S. Fernandes

Universidade Federal Rural do Semi-Árido/Centro de Ciências Agrárias. Mossoró, RN, Brasil. E-mail: goncalofilho.rn@gmail.com (Corresponding author); miguel@ufersa.edu.br; nildo@ufersa.edu.br; jfmedeir@ufersa.edu.br; cleyton1959@hotmail.com; vanies_agronomia@hotmail.com

https://orcid.org/0000-0002-9465-2637

Francisco V. da S. Sá

Universidade Federal Rural do Semi-Árido/Centro de Ciências Agrárias. Mossoró, RN, Brasil. E-mail: goncalofilho.rn@gmail.com (Corresponding author); miguel@ufersa.edu.br; nildo@ufersa.edu.br; jfmedeir@ufersa.edu.br; cleyton1959@hotmail.com; vanies_agronomia@hotmail.com

https://orcid.org/0000-0001-6585-8161

Francisco Gonçalo Filho - E-mail: goncalofilho.rn@gmail.com (Corresponding author)

Chemical characteristics
Depth (m)	pH H₂O	EC (dS m^-1)			P		K⁺		Na⁺		Ca²⁺			Mg²⁺		Al³⁺			(H+Al)		SB			CEC		V			m		ESP
Depth (m)	pH H₂O	EC (dS m^-1)			(mg dm^-3)						(cmol_c dm^-3)															(%)
0-0.20	6.6	0.12			7.0		162.3		21.53		2.76			0.73		0.00			0.77		4.00			4.77		84			0.0		2.1
0.20-0.40	6.05	0.05			6.7		128.5		34.50		2.50			2.16		0.05			1.15		5.14			6.29		82			1.0		2.4
Depth (mm)	OM		N					B					Cu					Fe					Mn					Zn
Depth (mm)	(g kg^-1)							(mg dm^-3)
0-0.20	5.88		0.70					0.30					0.91					7.26					185.73					3.32
0.20-0.40	2.97		0.44					0.20					0.89					3.23					26.16					1.54
Physical characteristics
Depth (m)	Sand	Silt		Clay		Textural classification				PD		BD			TP (%)		Moisture at tensions (kPa)								Water availability
	(g kg^-1)									(kg dm^-3)							10			33		500			TWA (mm cm^-1)		TWC			AWC
	(g kg^-1)									(kg dm^-3)							(%)								TWA (mm cm^-1)		(mm)
0-0.20	820	78		102		Loamy sand				2.77		1.68			36.6		11.85			6.74		3.84			1.34		26.85			13.42
0.20-0.40	608	70		322		Sandy clay loam				2.84		1.73			38.8		11.60			8.86		6.23			0.43		8.78			4.39

Characteristics	RW¹	SD	SW	SD
pH (H₂O)	7.40	±0.43	6.84	±0.17
EC (dS m^-1)	1.09	±0.15	0.09	±0.01
K⁺ (mg L^-1)	27.37	±3.91	9.38	±2.74
Na⁺ (mg L^-1)	74.95	±12.42	3.91	±0.23
Ca²⁺ (mg L^-1)	18.44	±1.80	11.14	±7.29
Mg²⁺ (mg L^-1)	23.33	±13.49	8.14	±4.37
Cl^- (mg L^-1)	125.85	±39.35	31.55	±2.13
CO₃² (mg L^-1)	0	0	0	0
HCO₃^- (mg L^-1)	408.70	±31.11	29.28	±1.83
SAR (mmol L^-1)^0.5	2.80	±0.48	0.21	±0.10
P⁺ (mg L^-1)	7.82	± 0.95	0.57	±0.12
N-NH₄ (mg L^-1)	29.91	±9.29	0.56	±0.98
N-NO₃ (mg L^-1)	14.58	±18.73	0.02	±0.03
SS (mg L^-1)	33.00	±11.00	0	0
SD (mg L^-1)	389.00	±39.00	53.00	±3.00
OGC (mg L^-1)	18.1	±3.32	-	-
BOD (mg L^-1)	18.75	±10.90	-	-
COD (mg L^-1)	94.00	±10.80	-	-
TC (MPN 100 mL^-1)	1100.00	±169.71	0	±0
TTC (MPN 100 mL^-1)	290.00	±44.74	0	±0
Cu (mg L^-1)	0.08	±0.005	0.02	±0.01
Mn (mg L^-1)	0.08	±0.009	0.06	±0.01
Fe (mg L^-1)	0.24	±0.018	0.23	±0.03
Zn (mg L^-1)	0.05	±0.041	0.15	±0.04
Cr (mg L^-1)	0	0	0	0
Ni (mg L^-1)	0	0	0	0
Cd (mg L^-1)	0	0	0	0
Pb (mg L^-1)	0	0	0	0

SV	DF	F test Pr ˃ Fc¹
		Cultivation cycle
		2016	2017
Block	5	0.43 ^ns	0.80 ^ns
Fertigation (Fg)	2	0.00**	0.00**
Fertilization (Ft)	1	0.53 ^ns	0.06 ^ns
Fg x Ft	2	0.70 ^ns	0.87 ^ns
Error	25
CV (%)		4.75	4.62
Fertigation²		Boll weight (g)³
T₁ – 100% SW		4.41 b	4.24 b
T₂ – 50% SW + 50% RW		5.32 a	5.36 a
T₃ – 100% RW		5.41 b	5.55 a
LSD		0.24	0.23

SV	DF	F test Pr ˃ Fc¹
SV	DF	N	P	K	Ca	Mg	Cu	Fe	Mn	Zn
		2016 cycle
Block	5	0.98^ns	0.54^ns	0.30^ns	0.01*	0.20^ns	0.60^ns	0.38^ns	0.19^ns	0.12^ns
Fertigation (Fg)	2	0.16^ns	0.12^ns	0.00**	0.00**	0.00**	0.41^ns	0.02*	0.00**	0.01*
Fertilization (Ft)	1	0.58^ns	0.04*	0.32^ns	0.85^ns	0.35^ns	0.07^ns	0.66^ns	0.95^ns	0.81^ns
Fg x Ft	2	0.38^ns	0.96^ns	0.36^ns	0.80^ns	0.63^ns	0.95^ns	0.30^ns	0.90^ns	0.15^ns
Error	25
CV (%)		14.33	30.84	17.92	27.84	32.50	26.38	20.12	28.96	44.02
Fertigation²		(g kg^-1)					(mg kg^-1)
T₁ – 100% SW		29.47 a	5.6 a	15.3 b	24.16 a	2.71 b	1.60 a	31.66 b	75.91 b	18.05 b
T₂ – 50% SW + 50% RW		32.74 a	4.3 a	17.8 b	17.76 b	1.93 b	1.47 a	40.50 a	108.50 b	17.00 b
T₃ – 100% RW		32.50 a	4.8 a	22.6 a	14.09 b	6.88 a	1.38 a	36.25 ab	447.66 a	27.58 a
LSD		4.60	1.50	3.40	5.28	1.27	0.39	7.39	62.07	9.35
Phosphate fertilization²
With P		31.15 a	5.5 a	18.0 a	18.83 a	4.03 a	1.60 a	35.61 a	211.33 a	20.51 a
Without P		31.99 a	4.4 b	19.1 a	18.51 a	3.64 a	1.36 a	36.66 a	210.05 a	21.25 a
LSD		3.10	1.00	2.20	3.56	0.85	0.26	4.99	41.88	6.31
		2017 cycle
Block	5	0.11^ns	0.78^ns	0.29^ns	0.10^ns	0.26^ns	0.58^ns	0.80^ns	0.04*	0.29^ns
Fertigation (Fg)	2	0.00*	0.00*	0.11^ns	0.00*	0.00*	0.02*	0.03*	0.00*	0.00*
Fertilization (Ft)	1	0.23^ns	0.01*	0.93^ns	0.78^ns	0.65^ns	0.08^ns	0.82^ns	0.90^ns	0.75^ns
Fg x Ft	2	0.50^ns	0.00*	0.86^ns	0.82^ns	0.35^ns	0.90^ns	0.96^ns	0.85^ns	0.91^ns
Error	25
CV (%)		6.53	21.28	10.05	25.55	16.16	9.65	11.28	13.08	8.29
Fertigation²
T₁ – 100% SW		28.32 b	4.7 a	14.5 a	27.74 a	2.24 b	0.95 ab	44.66 ab	78.00 c	8.59 a
T₂ – 50% SW + 50% RW		41.18 a	3.2 b	14.6 a	14.31 b	2.13 b	1.00 a	48.41 a	98.50 b	8.02 a
T₃ – 100% RW		43.65 a	2.7 b	15.7 a	13.5 b	10.33 a	0.89 b	42.66 b	221.16 a	5.90 b
LSD		2.5	0.7	1.5	4.81	0.8	0.09	5.19	17.63	0.63
Phosphate fertilization²
With P		37.22 a	3.9 a	14.9 a	18.73 a	4.96 a	0.96 a	45.44 a	132.22 a	7.47 a
Without P		38.21 a	3.2 b	14.9 a	18.3 a	4.84 a	0.93 a	45.05 a	132.88 a	7.53 a
LSD		1.69	0.5	1.0	3.24	0.54	0.06	3.5	11.90	0.42

[1] Francisco Gonçalo Filho - E-mail: goncalofilho.rn@gmail.com (Corresponding author)

Brasil

Brasil

Nutritional status of cotton plants under fertigation with reuse water and phosphate fertilization

Estado nutricional do algodoeiro fertigado com água de reuso e adubação fosfatada

ABSTRACT