Journal of Agricultural Science; Vol. 10, No. 7; 2018
ISSN 1916-9752 E-ISSN 1916-9760
Published by Canadian Center of Science and Education
Phosphorus and Zinc Extractable and Total in Substrate Enriched
Coconut Powder and Tomato Cultivation
David Correia dos Anjos1, Antônio Alves Maia Neto1, Gabrielen de Maria Gomes Dias2,
Fernando Felipe Ferreyra Hernandez1 & Rebecca Tirado-Corbala3
1
Department of Soil Science, Federal University of Ceará, Fortaleza, Ceará, Brazil
2
Institute of Rural Development, University of International Integration of Afro-Brazilian Lusophony, Redenção,
Ceará, Brazil
3
Department of Agro-Environmental Sciences, University of Puerto Rico-Mayaguez, Mayagüez, Puerto Rico
Correspondence: David Correia dos Anjos, Department of Soil Science, Federal University of Ceará, Fortaleza,
Ceará, Brazil. Tel: 55-85-987-775-247. E-mail: dav_correia@hotmail.com
Received: April 8, 2018
doi:10.5539/jas.v10n7p295
Accepted: May 12, 2018
Online Published: June 15, 2018
URL: https://doi.org/10.5539/jas.v10n7p295
Abstract
Phosphorus (P) and Zinc (Zn) stand out for their interactions, however, little is known about the interaction of
these elements in organic substrates used in the development of plants. The objective of this work was to
evaluate the extractable and total P and Zn of the enriched coconut powder substrate and the development of
tomato seedlings grown on the same substrate. The work consisted of 10 treatments and 4 replicates with
different doses of P and Zn. The substrate used was coconut powder enriched with nutrient solutions in a ratio of
10:1 (v/m). Then, the experiment was conducted using the enriched substrate to observe the effect of P and Zn
doses on the development of tomato seedlings in trays. The height, number of leaves and the dry matter of the
plants were evaluated. For the water and Mehlich-1 extractors the highest values of P and Zn were for treatments
with the highest doses and only the quadratic positive effect of P did not differ statistically in the enriched
coconut powder substrate. The results showed that the coconut powder used as substrate is deficient in P and Zn.
The highest development of the seedlings was obtained at the doses of 74 mg L-1 P and 3.25 and 4.75 mg L-1 Zn
of the substrate enrichment solution.
Keywords: Mehlich-1, nutrition, organic substrates
1. Introduction
Substrate is the medium in which the roots of the plants develop, whose primary function is to provide support to
the plants growning in them, and to regulate nutrient and water availability (Fermino & Kampf, 2012; Fonteno,
1996; Zorzeto et al., 2014). There are several scientific studies that characterize physically the different types of
substrates (Cardoso et al., 2010; Pagliarini et al., 2012). Among the substrates studied, there is coconut powder that
is widely used in different parts of the world (Cardoso et al., 2010).
Plant cultivation using substrate is a technique widely used in most advanced horticulture countries. The use of
coconut powder as a substrate is an alternative for the preservation of several trees (for example orchids and
bromeliads). In addition, it helps to reduce the volume of waste generated, since after the consumption of water,
coconut is often discarded, making it an inconvenience to garbage collectors and shortening the life of public
landfills (Kampf & Fermino, 2000). In this way, the most sensible and ecologically correct trend in the destination
of solid waste generated is the recycling of these materials, with the consequent preservation of the environment
(Kampf & Fermino, 2000).
Plants need for their development to absorb and assimilate adequate amounts of essential nutrients (Souza Júnior et
al., 2011). The absence of any of the nutrients in the soil or in the culture medium may limit the production of the
plant (Freitas et al., 2011). Deficiency or excess of a mineral element influences the absorption or activity of other
nutrients, as a consequence can affect the metabolism of the plant.
The interaction of phosphorus (P) and zinc (Zn) has been studied for a long time in soils, however little is known
about the interaction between these two elements in organic substrates, specifically in coconut powder. The
description of Zn deficiency induced by P is classic in the literature; high concentrations of P in the soil or nutrient
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solution cause decrease in the availability of Zn (Corrêa et al., 2014). This is often attributed to the insolubilization
of Zn by the P on the root surface, decreasing its absorption (Malavolta et al., 1997). Phosphorus precipitates Zn as
zinc phosphate Zn3(PO4)2, preventing absorption by plants (Marschner, 1997).
Phosphorus interactions with Zn can occur in the soil or plant, the latter being considered as the main one (Cakmak
& Marschner, 1987). In the first case, the effect may modify the availability of the nutrient or its own absorption.
The interactions may occur in the absorption process, in radial or long-distance transport, and in P metabolism
(Rober, 2000). The interaction Phosphorus and Zinc (P-Zn) has been well studied, but is a complex phenomenon
and still not understood, since there are contradictory results such as: P has no influence on the absorption of Zn;
there may be a mutual antagonism between P and Zn, particularly when one of the elements exceeds the critical
level (Boawn & Legget, 1963), P can increase Zn uptake (Pauli et al., 1968), and P may decrease Zn uptake
(Adriano et al., 1971).
The increase in P levels in the solution can occured by many mechanisms, decrease the concentration of Zn in the
leaves, inducing Zn deficiency, with the appearance of deficiency symptoms, even when the concentration of Zn in
the leaf appears to be adequate. The excess of P increases the physiological requirement of Zn and stimulates
changes in the pectic materials of the cell wall of the roots, suggesting that the low levels of Zn can lead to the
concentrations of P to toxic levels (Iorio et al., 2008) and consequently the development of plants.
Under hydroponic conditions, Moreira et al. (2001) and Corrêa et al. (2014) working with lettuce and pitaea,
respectively, observed that the level of Zn in the leaves decreased with the increase in the contents of P, being
easily increased with the supply of Zn, demonstrating that the balance between these two nutrients is fundamental
for the absorption of Zn.
The objective of this work was to evaluate the amount of P and Zn soluble in water, Mehlich-1 and total substrate
powder of enriched coconut and in the development of tomato seedlings cv. Santa Clara cultivated on the same
substrate.
2. Material and Methods
The experiment was conducted in two phases, one in the laboratory and the other in a greenhouse, both located in
the Soil Science Department of the Federal University of Ceará (UFC), in Fortaleza, Ceará, Brazil.
2.1 Preparation of the Substrate
The substrate used in the experiment was dry coconut powder, purchased from the processing plant of
EMBRAPA-AGROTROPICAL (Fortaleza, CE). Before enrichment with P and Zn the material was sieved (2.0
mm sieves) and after washing, to remove excess salts, until reaching an electrical conductivity ≤ 0.4 dS m-1.
2.2 Conducting the Experiment
Coconut powder was enriched by incubating it with nutrient solution for a period of 15 days in plastic containers of
10 liters’ capacity, using the ratio of 10:1 (volume/massa) between the nutrient solution and substrate. After the
incubation period the substrate was separated from the solution and air dried. The treatments applied in the
enriched substrate were formed by the combination of five doses of P-(5.7, 39.9, 56.9, 74 and 108 mg L-1) in the
form of monobasic potassium phosphate (KH2PO4) and five doses of Zn-(0.25, 1.75, 2.5, 3.25 and 4.75 mg L-1) as
zinc sulfate (ZnSO4) according to the Pan Puebla II matrix (Table 1) the remaining nutrients are constant. The
design was completely randomized blocks with 10 treatments and four replicates, totalizing 40 experimental units.
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Table 1. Doses of phosphorus (P) and zinc (Zn) enrichment of the treatment solution according to the experimental
matrix Plan Puebla II used in the experiment
Treatment
P
-0.3
-0.3
0.3
0.3
0.0
0.3
0.9
-0.3
-0.9
Control
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
Levels
Zn
0.3
-0.3
0.9
0.3
0.0
-0.3
0.3
-0.9
-0.3
Control
P
39.9
39.9
74
74
56.9
74
108
39.9
5.7
0.0
Doses (mg L-1)
Zn
3.25
1.75
4.75
3.25
2.5
1.75
3.25
0.25
1.75
0.0
2.3 Determination of the Effect of Phosphorus and Zinc (P-Zn)
After incubation on the air-dried substrate, the water-soluble P and Zn contents, Mehlich-1 extractor and totals
were determined. Extracts obtained using water or extractor/substrate ratio of 15:1 (v/m) and 60 minutes of
stirring at 200 rpm on a horizontal table were used in the determination of water-soluble P and Zn and in
Mehlich-1. The determination of total P and Zn was performed by colorimetric and atomic absorption,
respectively, in nitroperchloric (HNO3-HClO4) extract (Malavolta et al., 1997).
In greenhouse to observe the effect of the doses of P and Zn on the development of plants, the incubated substrate
was placed in plastic trays of 63 cells and after sowing three seeds per cell of tomato cv. Saint Clara. Then, 7 days
after germination, the thinning was done leaving one plant per cell. In treatments with enriched coconut powder the
plants received no additional fertilization. Irrigation was performed with water used in the public supply of the
Fortaleza region.
After 24 days of cultivation, the tomato plants were evaluated for: plant height, number of leaves and
determination of the dry matter of the plants.
2.4 Statistical Analysis
The values obtained for the evaluated characteristics were submitted to analysis of variance. The averages were
compared by the Tukey’s test (p > 0.01) and the doses of P and Zn used in the substrate incubation were submitted
to regression analysis, at 1% probability of error.
3. Results and Discussion
The water-soluble P ranged from 25 to 93 mg kg-1 (Table 2) representing 13.4 to 64% of the P extracted in
Mehlich-1 and from 1.7 to 2.4% of the total P.
Table 2. Water-soluble phosphorus (P) and zinc (Zn) contents, Mehlich-1 and total substrate coconut powder
enriched
Treatment
T1
T2
T3
T4
T5
T6
T7
T8
T9
Control
DMS
C.V. (%)
Soluble in water
Soluble in Mehlich-1
Nutrient Totals
P
Zn
P
Zn
P
Zn
------------------------------------------------------ mg kg-1 ----------------------------------------------------34
11.57
194
17.88
1624
32.3
42
10.38
186
17.78
1800
29.17
45
15.95
313
35.55
2674
54.73
50
11.71
370
21.01
2813
37.82
58
12.78
308
21.84
2270
34.74
44
10.81
357
16.61
2759
28.34
93
12.74
531
21.53
3864
35.86
28
8.02
198
14.83
1503
22.65
31
8.89
59
17.71
1497
29.46
25
0.53
39
12.71
1487
22.94
4.81
0.510
176
3.80
395
2.53
3.91
1.71
4.44
6.66
6.12
2.664
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The treatment with the highest dose of P (108 mg L-1) combined with the dose of Zn 3.25 mg L-1 (T7) presented the
highest content of water-soluble P (93 mg kg-1) differing statistically from other treatments. In this treatment, the
water soluble P was 272% higher than the control treatment, which did not receive fertilization, and soluble P came
from the substrate coconut powder itself. Similar results were found by Lima et al. (2011) that verified the content
of P is significantly lower in the coconut-based substrate compared to other substrates used in the production of
tomato seedlings.
In the treatment enriched with 56.9 mg L-1 P solution and 2.5 mg L-1 Zn-P water-soluble P increased 132% when
compared to the control. The treatments with 74 mg L-1 of P + 3.25 and 4.75 mg L-1 of Zn the increases of soluble
P in relation to the control treatment were 100 and 80%, respectively (Table 2). In the other treatments, these values
were lower than 80%. Anand et al. (2002) working with coconut powder enrichment found values of water-soluble
P at 60 days after incubation of 200 mg kg-1 and at 120 days of incubation the amount of water-soluble P was 250
mg kg-1. The highest amount of soluble P found by these researchers in water relative to the present study (93 mg
kg-1), are explicable because they incubated the coconut powder directly with phosphate rock and manure and no
immersion in nutrient solution.
The water-soluble P content of the enriched substrate presented a linear and quadratic regression coefficient
positive for the effect of P and Zn respectively and negatively for the interaction of P-Zn (Table 3).
Table 3. Multiple regression coefficients of water soluble P, Mehlich-1 and total coconut powder content as a
function of the P and Zn rates
Variable
P
Zn
P2
Zn2
P-Zn
Constant
R2
Soluble Water
0.197546 × 10-02**
0.0247701**
0.145620 × 10-04**
0.994116 × 10-02**
-0.139820 × 10-02**
-0.0394261
0.676421
Soluble Mehlich-1
0.0160089**
0.131950**
0.633687 × 10-04**
0,0798644**
-0.942120 × 10-02**
-0.333604
0.846094
Total
0.0876385**
0.670040**
0.692578 × 10-03**
0.594980**
-0.0655047**
-1.30569
0.851993
Note. **, *, 0: Significant at 1, 5 and 10% probability by the T test, respectively; ns: not significant.
The water soluble Zn contents were influenced by the combined doses of P and Zn applied to the substrate. The
highest Zn dose (4.75 mg kg-1) (T3) also had the highest water solubleZn content (15.9 mg kg-1) differing
statistically from the other treatments and showed an increase of 209% in relation to the control treatment (Table
4).
Table 4. Multiple regression coefficients of the contents of water soluble Zn, Mehlich-1 and total in the enriched
coconut powder as a function of the doses of P and Zn
Variable
P
Zn
P2
Zn2
P-Zn
Constant
R2
Soluble Water
0.150277**
-1.7733ns
0.24988 × 10-03**
0.960938**
-0.0686756**
9.80026
0.600365
Soluble Mehlich-1
0.242997**
-8.05740**
0.0012338ns
2.50064**
-0.138346**
24.5577
0.724586
Total
0.459704**
-8.56924*
0.003014520
4.27254**
-0.300553*
31.8304
0.652137
Note. **, *, 0: Significant at 1, 5 and 10% probability by the T test, respectively; ns: not significant.
Anand et al. (2002) working with enriched coconut powder after 120 days of incubation found levels of
water-soluble Zn around 1 mg kg-1. The water soluble Zn content of the enriched substrate was positively
influenced by the dose of P and Zn applied, presenting highly significant regression coefficients for the simple P
and Zn effect of P and Zn, respectively, while in the interaction P and Zn influence was negative (Table 4).
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The P and Zn contents extracted by the double acid (Mehlich-1) are presented in Table 2. In the treatment with the
highest dose of P (108 mg L-1) the P extracted was 126% higher than the control treatment (39 mg kg-1), differing
statistically from the other treatments.
At the lowest dose of P (5.7 mg L-1) combined with the dose of Zn (1.75 mg L-1) the P content extracted by
Mehlich-1 was 59 mg kg-1, 461% lower than that extracted with the highest dose (531 mg kg-1).
At the dose of 74 mg L of P combined with the doses of 2.5 and 4.75 mg L-1 of Zn or P extracted by Mehlich-1 was
five to 7 times greater than the control. The Mehlich-1 soluble P content of the enriched substrate was positively
influenced by the simple and quadratic effect of P and Zn respectively and negatively by the interaction of P-Zn
(Table 3). Zinc extracted with Mehlich-1 from the treatment (T3) with the highest Zn dose (4.75 mg L-1) was 180%
higher (35.55 mg kg-1) when compared to treatment (T10) received fertilization (12.7 mg kg-1), differing
statistically from the other treatments (Table 2).
The Zn-soluble Zn content of the enriched substrate was positively influenced by the simple P and quadratic effect
of Zn respectively and negatively by the simple Zn effect and by the P-Zn interaction and not being influenced by
the quadratic effect of P (Table 4).
The total P and Zn contents varied from 1.487 to 3.864 mg kg-1 and from 22.9 to 35.9 mg kg-1, respectively, in the
coconut powder enriched by incubation (Table 2). Presented lower values the control treatment and the higher
values the treatment that received the highest dose of nutrients.
The total P in the coconut powder increased with the dose of P applied in the enrichment solution, presenting on
average contents of 1.487 mg kg-1; 1.497 mg kg-1; 1.624 mg kg-1; 2.270 mg kg-1; 2.759 mg kg-1 and 3.864 mg kg-1
for the doses of Zn 0.0; 5.7; 39.9; 74 and 108 mg L-1, respectively. However, when considered as constant the doses
of 39.9 mg L-1 of P combined with increasing doses of Zn 0.25; 1.75 and 3.25 mg L-1 the total P amounts in the
substrate were on average 2.270 mg kg-1 and these treatments did not differ from each other. At the dose of 74 mg
L-1 of P (T6, T4 and T3) and increasing doses of Zn 1.75; 3.25 and 4.75 mg L-1 on average the total P content was
2.748 mg kg-1. The total P content of the enriched substrate was positively influenced by the simple and quadratic
effect of P and Zn respectively and negatively by the interaction of P-Zn (Table 3). Similarly, to total P the
treatments with increasing doses of P 5.7; 39.9 and 74 mg L-1 that received the same dose of 1.75 mg L-1 did not
show significant differences among them in the quantification of total Zn contents (Table 2).
Differently from the treatments that received constant doses of Zn 3.25 mg L-1 and increasing doses of P 39; 74 and
108 mg L-1 the total Zn contents in the substrate increased statistically significant with increasing doses of P. This
behavior suggests an interaction between P and Zn, where the increase in Zn contents in the substrate explained by
its precipitation in the form of zinc phosphate (Marschner, 1997; Muner et al., 2011). This result also explains the
coefficient of linear and quadratic regression positive and statistically significant for the effect of P (Table 4).
The height, number of leaves and dry mass of tomato plants grown in the enriched coconut powder can be seen in
Table 5. The plants grown on the enriched substrate had a mean height of 17.45 cm (Table 5). In the treatment that
received the lowest dose of Zn presented the lowest height. The treatments that received doses of 39.9 mg L-1 and
5.7 mg L-1 of P combined with the doses of 0.25 mg L-1 and 1.75 mg L-1 of Zn presented the lowest heights of 11.7
and 15.5 cm, respectively, and the treatment with the dose of P 74 mg L-1 and Zn of 1.75 mg L-1 presented the
highest height of all treatments. The control treatment was the one with the lowest value for height, showing that
the amount of nutrient was not enough for the plant growth. Muner et al. (2011) observed with the application of
excessive phosphate fertilization can lead to Zn deficiency in the substrate, because P renders Zn unavailable at the
root surface or precipitates it, impairing the assimilation of the nutrient by the plants.
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Table 5. Height, number of leaves and dry matter of tomato seedlings cv. Santa Clara at 24 days of culture in the
substrate coconut powder with different doses of P and Zn
Treatment
T1
T2
T3
T4
T5
T6
T7
T8
T9
Control
DMS
C.V.
Variables evaluated
Sheet
2.90
2.52
2.34
2.08
2.36
2.58
2.33
2.04
2.01
1.96
0.48
8.55
Height
23.5
21.2
23.3
22.8
23.5
24.4
21.9
11.7
15.5
9.55
3.50
7.35
Dry mass
2.21
1.82
2.25
2.29
2.18
2.08
2.08
1.11
1.39
0.68
0.28
6.52
The plants grown on the enriched substrate had a mean height of 17.45 cm (Table 5). In the treatment that received
the lowest dose of Zn presented the lowest height. The treatments that received doses of 39.9 mg L-1 and 5.7 mg L-1
of P combined with the doses of 0.25 mg L-1 and 1.75 mg L-1 of Zn presented the lowest heights of 11.7 and 15.5
cm, respectively, and the treatment with the dose of P 74 mg L-1 and Zn of 1.75 mg L-1 presented the highest height
of all treatments. The control treatment (T10) was the one with the lowest value for height, showing that the
amount of nutrient was not enough for the plant growth. Muner et al. (2011) observed with the application of
excessive phosphate fertilization can lead to Zn deficiency in the substrate, because phosphorus renders zinc
unavailable at the root surface or precipitates it, impairing the assimilation of the nutrient by the plants.
Analyzing the effect of fertilization with P and Zn in relation to plant height, it was verified that there was a
significant difference between the control that did not receive P and Zn and those that received the lower doses of
P and Zn. There were also significant differences between the treatments with the higher doses of P and Zn and the
lower doses of these nutrients. Similar results were found by Batista et al. (2011) that observed the increase of the
availability of P in the substrate favored positive result on the vegetative growth of the plants. The polynomial
regression analysis showed a positive and highly significant linear coefficient (p ≤ 0.01) for P and Zn, while the
quadratic coefficient was not significant for P and significant at 5% probability for Zn. This variable had a low
coefficient of variation (CV = 7.35%) and a high coefficient of determination (R2 = 0.86) (Table 6).
Table 6. Coefficient of multiple regression and determination of height, leaf number and dry matter yield of aerial
part of tomato seedlings cv. Santa Clara at 24 days of substrate cultivation coconut powder with different doses of
P and Zn
Variable
P
Zn
P2
Zn2
P-Zn
Constant
R2
Height
0.0673182**
3.76557**
-0.314133E-4ns
-0.10737*
-0.00710115*
0.298931
0.859252
N° of leaves
0.00618447**
0.275858**
0.79979E-5*
0.0147051*
-0.00170356**
0.735564
0.490221
Mass
0.00549146**
0.306936**
-0.544234E-5**
-0.0114257**
-0.314955E-30
0.178695
0.929936
Note: **, *, 0: Significant at 1, 5 and 10% probability by the T test, respectively; ns: not significant.
The number of leaves was also influenced by increasing doses of P and Zn (Table 5). The lower doses of P and Zn
presented values that did not differ statistically and the treatment with the dose of P and Zn 39.9 and 2.5 mg L-1
presented higher results than the other treatments for the plants grown in enriched substrate. When the polynomial
regression model was applied to this variable, the linear coefficient for P and Zn was positive and highly significant.
The quadratic coefficients were significant at 5% probability. However, the coefficient of determination was the
lowest (R2 = 0.50) suggesting that the number of leaves is the least reliable variable of the three determined (Table
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6). This behavior was also observed Corrêa et al. (2014), who concluded that the application of P and Zn, and the
zinc phosphorus interaction affect the availability of both nutrients in the substrate, root system and shoot, thus
influencing initial plant growth.
The dry matter yield of the plants, considering all the treatments varied from 0.68 to 2.29 g plant-1 with the doses of
P and Zn (Table 5). The doses of 74 mg L-1 of P and 3.25 mg L-1 of Zn presented the highest dry mass production
(2.29 g plant-1) of all treatments. For this variable the DMS was 0.284 and the CV of 6.52%. According to Muner
(2011), well-supplied plants in P and Zn present significant dry mass averages.
In the polynomial regression of the dry matter of the tomato seedlings presented linear coefficients positive and
quadratic negative highly significant for the doses of P and Zn. The coefficient of determination of dry matter was
the highest (R2 = 0.93) indicating it as the most reliable of the variables studied (Tables 6).
4. Conclusions
High doses of P reduce the Zn content of the solution and increase its total content in the substrate dry coconut
powder. Increase in the doses of P and Zn also increase the P extracted in water, Mehlich-1 and total in the substrate
dry coconut powder. The coconut powder used as a substrate is deficient in P and Zn. The highest development of
tomato seedlings cv. Santa Clara on the substrate coconut powder is obtained with the doses of 74 mg L-1 P and
3.25 and 4.75 mg L-1 Zn of the substrate enrichment solution.
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