Effect of banded fertilizers on soil solution composition and short-term root-growth .1. Ammonium-sulfate, ammonium-nitrate, potassium-nitrate and calcium nitrate

Soil Research ◽  
1995 ◽  
Vol 33 (4) ◽  
pp. 673 ◽  
Author(s):  
PW Moody ◽  
RL Aitken ◽  
SA Yo ◽  
DG Edwards ◽  
LC Bell
Keyword(s):  
Electrical Conductivity ◽  
Soil Solution ◽  
Soil Type ◽  
Root Elongation ◽  
Calcium Nitrate ◽  
Curvilinear Relationship ◽  
Contact Period ◽  
Solution Composition ◽  
Nitrate Salts ◽  
Relative Root

To simulate the effects of banded fertilizer on soil solution composition, layers of KNO3, NH4NO3, Ca(NO3)2.4H2O or (NH4)2SO4 were placed in contact with soil columns and allowed to equilibrate for 5 days at a moisture content equivalent to 10 kPa matric suction. Five soils were used in the columns: 0-10 cm samples from a Kurosol, a Ferrosol, a Vertosol and a Kandosol, and a 50-60 cm sample from the Kandosol. After the contact period, soil sections were recovered at successive 5 mm increments from the fertilizer layer, the last section being 45-50 mm from the layer. Soybean seedlings (Glycine max (L.) Merr. cv. Forrest) were grown for 48 h in each section and relative root elongation (RRE) was determined. Soil solution was then extracted from each section and analysed. Nitrate salts moved 50 mm in all soils (measured as a change in the electrical conductivity of the soil solution), but the movement of the sulfate salt was dependent on soil type and was least in the Ferrosol. As distance from the fertilizer band decreased, concentrations of cations in the soil solution increased, often reaching a plateau value. In all soils, solution Ca concentrations near the (NH4)2SO4 fertilizer band were lower than those further away, indicating precipitation of CaSO4.2H2O had occurred. This effect was particularly evident in the Vertosol and Ferrosol. The relationship between electrical conductivity of the soil solution (ECss) and Ca activity ratio (CAR) was dependent on soil type and fertilizer source. For the sulfate source, all soils exhibited a common curvilinear relationship in which CAR decreased with increasing ECss. However, for the nitrate salts, the Ferrosol and Vertosol had a higher CAR for a given ECss than the other soils because of the higher Ca2+ activities in their soil solutions. Relative root elongation decreased curvilinearly with increasing ECss, and a common curve was obtained for all soils and fertilizer sources. Although CAR decreased with increasing ECss, there was no common curve relating RRE to CAR for all soils and fertilizer sources. Osmotic effects, and not a salt-induced Ca deficiency, were therefore considered responsible for the decrease in RRE as distance from the fertilizer source decreased. A 10% reduction in RRE occurred at an ECss of 4.1 mS cm-1.

Effect of banded fertilizers on soil solution composition and short-term root-growth .2. Mono-ammonium and di-ammonium phosphates

Soil Research ◽  
1995 ◽  
Vol 33 (4) ◽  
pp. 689 ◽  
Author(s):  
PW Moody ◽  
DG Edwards ◽  
LC Bell
Keyword(s):  
Root Growth ◽  
Soil Solution ◽  
Root Elongation ◽  
Ammonium Phosphate ◽  
Contact Period ◽  
Solution Composition ◽  
Solution Ph ◽  
Organic C ◽  
Precipitation Reactions ◽  
Relative Root

A layer of mono- or di-ammonium phosphate (MAP and DAP, respectively) was placed in contact for 5 days with duplicate columns of soil at a water content equivalent to 10 kPa matric suction. This was designed to simulate the effects of banded fertilizer on soil solution composition. Five soils were used: 0-10 cm samples from a Kurosol, a Ferrosol, a Vertosol and a Kandosol, and a 50-60 cm sample from the Kandosol. After the contact period, soil sections were recovered at successive 5 mm intervals from the fertilizer layer, the last section being 45-60 mm from the layer. Soybean (Glycine max (L.) Merr.) seedlings were grown for 48 h in each section and relative root elongation was determined. Soil solution was then extracted from each section and analysed. The amount of inorganic P in the soil solution (P-i) was summed over all soil sections for each soil and each P source and was found to be correlated with distance of P movement from the simulated band (r = 0 . 792, P < 0.01). Of several soil chemical parameters of the control (unfertilized) soils regressed against Pi, the following showed significant (P = 0.05) negative correlations: Ca and Mg concentrations in the soil solution for Pi from both MAP and DAP, exchangeable Ca and Mg for DAP, and citrate-dithionite extractable Fe and Al for MAP. These results suggest that adsorption (and possibly precipitation) reactions with Fe and Al hydrous oxides contributed to the removal of P-i from solution in the presence of MAP. However, with DAP as the fertilizer source, precipitation reactions involving Ca and Mg were the predominant factors. Dissolved organic C in the soil solution increased adjacent to both DAP and MAP, with larger amounts in proximity to DAP being a consequence of the higher soil solution pH (~ 7). Soil solution Si increased in all soils adjacent to both DAP and MAP, with concentrations being higher in the MAP treatments. Dissolution of aluminosilicates in the acidic conditions near MAP (pH ~5) was the probable cause. Relative root elongation (RRE) of soybean was restricted in soil sections close to the fertilizer. When RRE was plotted against each of soil solution EC, NH3 activity, and calcium activity ratio (CAR), a single curvilinear function described the relationship between RRE and CAR for all soils and both P sources. It is concluded that a salt-induced Ca deficiency was the cause of restricted root growth in proximity to DAP and MAP, rather than an osmotic effect or NH3 toxicity.

The chemical composition and ionic strength of soil solutions from New Zealand topsoils

Soil Research ◽  
1985 ◽  
Vol 23 (2) ◽  
pp. 151 ◽  
Author(s):  
DC Edmeades ◽  
DM Wheeler ◽  
OE Clinton
Keyword(s):  
Soil Moisture ◽  
New Zealand ◽  
Ionic Strength ◽  
Soil Solution ◽  
Soil Type ◽  
Ionic Composition ◽  
Soil Samples ◽  
Minor Effect ◽  
Solution Composition ◽  
Soil Solutions

In preliminary experiments a centrifuge method for extracting soil solutions was examined. Neither the time nor speed of centrifuging had any effect on the concentrations of cations in soil solution. The concentration of cations increased with decreasing soil moisture content, and NO3, Ca, Mg, and Na concentrations increased with increasing time of storage of freshly collected moist soils. It was concluded that to obtain soil solutions, which accurately reflect the soil solution composition and ionic strength (I) in situ, requires that soil samples are extracted immediately (<24 h) following sampling from the field. Prior equilibration of soil samples, to adjust soil moisture contents, is therefore not valid. The effect of time of sampling and soil type, and the effects of fertilizer and lime applications, on soil solution composition and ionic strength, were measured on freshly collected field moist topsoils. Concentrations of Ca, Mg, K, Na, NH, and NO, were lowest in the winter and highest in the summer. Consequently, there was a marked seasonal variation in ionic strength which ranged from 0.003 to 0.016 mol L-1 (mean, 0.005 s.d. 0.003) over time and soil type. Withholding fertilizer (P, K, S, Ca) for two years had only a minor effect on ionic composition and strength, and liming increased solution Ca, Mg and HCO3, but decreased Al, resulting in a twofold increase in ionic strength. These results suggest that the ionic strength of temperate grassland topsoils in New Zealand lie within the range 0.003-0.016 and are typically 0.005.

Corrigenda - The chemical composition and ionic strength of soil solutions from New Zealand topsoils

Soil Research ◽  
1985 ◽  
Vol 23 (2) ◽  
pp. 151
Author(s):  
DC Edmeades ◽  
DM Wheeler ◽  
OE Clinton
Keyword(s):  
Soil Moisture ◽  
New Zealand ◽  
Ionic Strength ◽  
Soil Solution ◽  
Soil Type ◽  
Ionic Composition ◽  
Soil Samples ◽  
Minor Effect ◽  
Solution Composition ◽  
Soil Solutions

In preliminary experiments a centrifuge method for extracting soil solutions was examined. Neither the time nor speed of centrifuging had any effect on the concentrations of cations in soil solution. The concentration of cations increased with decreasing soil moisture content, and NO3, Ca, Mg, and Na concentrations increased with increasing time of storage of freshly collected moist soils. It was concluded that to obtain soil solutions, which accurately reflect the soil solution composition and ionic strength (I) in situ, requires that soil samples are extracted immediately (<24 h) following sampling from the field. Prior equilibration of soil samples, to adjust soil moisture contents, is therefore not valid. The effect of time of sampling and soil type, and the effects of fertilizer and lime applications, on soil solution composition and ionic strength, were measured on freshly collected field moist topsoils. Concentrations of Ca, Mg, K, Na, NH, and NO, were lowest in the winter and highest in the summer. Consequently, there was a marked seasonal variation in ionic strength which ranged from 0.003 to 0.016 mol L-1 (mean, 0.005 s.d. 0.003) over time and soil type. Withholding fertilizer (P, K, S, Ca) for two years had only a minor effect on ionic composition and strength, and liming increased solution Ca, Mg and HCO3, but decreased Al, resulting in a twofold increase in ionic strength. These results suggest that the ionic strength of temperate grassland topsoils in New Zealand lie within the range 0.003-0.016 and are typically 0.005.

Viscosity, electrical conductivity and density of the system ammonium nitrate-dimethyl sulphoxide

1984 ◽  
Vol 49 (5) ◽  
pp. 1109-1115
Author(s):  
Jindřich Novák ◽  
Zdeněk Kodejš ◽  
Ivo Sláma
Keyword(s):  
Electrical Conductivity ◽  
Aqueous Solutions ◽  
Ammonium Nitrate ◽  
Transport Properties ◽  
Calcium Nitrate ◽  
Dimethyl Sulphoxide ◽  
Present System ◽  
Empirical Equations ◽  
Concentrated Solutions ◽  
Nitrate Solutions

The density, viscosity, and electrical conductivity of highly concentrated solutions of ammonium nitrate in dimethyl sulphoxide have been determined over the temperature range 10-60 °C and the concentration range 7-50 mol% of the salt. The variations in the quantities as a function of temperature and concentration have been correlated by empirical equations. A comparison is made between the transport properties for the present system, aqueous solutions of ammonium nitrate, and calcium nitrate solutions in dimethyl sulphoxide.

Early Pinus caribaea var. hondurensis root development. 2. Influence of soil strength

1996 ◽  
Vol 36 (7) ◽  
pp. 847 ◽  
Author(s):  
A Costantini ◽  
D Doley ◽  
HB So
Keyword(s):  
Root Development ◽  
Soil Type ◽  
Root Elongation ◽  
Primary Root ◽  
High Strength ◽  
Soil Strength ◽  
Shoot Development ◽  
Pinus Caribaea ◽  
Primary Shoot ◽  
Primary Roots

The influence of penetration resistance (PR), an easily measured indicator of soil strength, on the growth of Pinus caribaea var. hondurensis radicles and seedlings was investigated. Negative exponential relationships between PR and both radicle and primary root elongation were observed. All root elongation ceased at PR levels of 3.25 MPa. Tip diameters of radicles and primary roots were positively correlated with PR values up to 2.4 MPa, whilst numbers of primary roots, total root lengths and lengths of longest roots were all negatively correlated with PR. Hypocotyl elongation was also reduced by increasing PR, although the reductions occurred at higher PRs than those which inhibited root development. In contrast, primary shoot development was unaffected by PR levels which were sufficient to stop root elongation, but was reduced in soil with a PR of 4.8 MPa. There were significant family x soil type and family x PR interactions for radicle, hypocotyl, primary root and primary shoot development. 1f these interactions are correlated with performance in the field, then they may serve as useful indicators of family suitability to both soil type and high strength soils.

scholarly journals Concentration of injetion solution and its effects on soil and on yield of fertirrigated banana cv. Terra Maranhão

2014 ◽  
Vol 34 (6) ◽  
pp. 1104-1113 ◽  
Author(s):  
Eugênio F. Coelho ◽  
Torquato M. de Andrade Neto ◽  
Damiana L. Barros
Keyword(s):  
Electrical Conductivity ◽  
Soil Solution ◽  
Irrigation Water ◽  
Urea Concentration ◽  
Injection Solution ◽  
Combined Application ◽  
Saturation Extract ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Micro Irrigation

The Fertigation is the combined application of water and nutrients to a crop. It can be adapted to all types of agricultural crops. The objective of this study was to evaluate the effect of urea concentration in irrigation water on electrical conductivity of the soil solution and saturation extract along the first cycle of banana cv. Terra Maranhão. The experiment followed a completely randomized design with six treatments and ten replications. Treatments regarded for using three urea concentrations (1.0; 2.5 and 4.0 g L-1) in irrigation water applied by two micro irrigation systems (microsprinkler and drip). Results showed that there was a linear elevation of electrical conductivity of saturation extract and soil solution with the increase on concentration of urea in the injection solution. Urea should be used under concentrations up to 2.5 g L-1 in irrigation water without causing increase on electric conductivity of soil solution and saturation extract, considering 1.1 dS m-1 as the tolerated value for the crop. Nitrate in the soil solution increased significantly with the increase of urea concentration in the injection solution. The maximum concentration of nitrate in the soil occurred for 4,0 g L-1 concentration of the injection solution.

Amelioration of subsurface acidity in sandy soils in low rainfall regions .2. Changes to soil solution composition following the surface application of gypsum and lime

Soil Research ◽  
1994 ◽  
Vol 32 (4) ◽  
pp. 847 ◽  
Author(s):  
CDA Mclay ◽  
GSP Ritchie ◽  
WM Porter ◽  
A Cruse
Keyword(s):  
Ionic Strength ◽  
Soil Solution ◽  
Ion Pairs ◽  
Chemical Properties ◽  
Sandy Soils ◽  
Soil Surface ◽  
Field Trials ◽  
Annual Rainfall ◽  
First Year ◽  
Solution Composition

Two field trials were sampled to investigate the changes to soil solution chemical properties of a yellow sandplain soil with an acidic subsoil following the application of gypsum and lime to the soil surface in 1989. The soils were sandy textured and located in a region of low annual rainfall (300-350 mm). Soil was sampled annually to a depth of 1 m and changes in soil solution composition were estimated by extraction of the soil with 0.005 M KCl. Gypsum leaching caused calcium (Ca), sulfate (SO4) and the ionic strength to increase substantially in both topsoil and subsoil by the end of the first year. Continued leaching in the second year caused these properties to decrease by approximately one-half in the topsoil. Gypsum appeared to have minimal effect on pH or total Al (Al-T), although the amount of Al present as toxic monomeric Al decreased and the amount present as non-toxic AlSO+4 ion pairs increased. Magnesium (Mg) was displaced from the topsoil by gypsum and leached to a lower depth in the subsoil. In contrast, lime caused pH to increase and Al to decrease substantially in the topsoil, but relatively little change to any soil solution properties was observed in the subsoil. There was an indication that more lime may have leached in the presence of gypsum in the first year after application at one site. Wheat yields were best related to the soil acidity index Al-T/EC (where EC is electrical conductivity of a 1:5 soil:water extract), although the depth at which the relationship was strongest in the subsoil varied between sites. The ratio Al-T/EC was strongly correlated with the activity of monomeric Al species (i.e. the sum of the activities of Al3+, AlOH2+ and Al(OH)+2 in the soil solution. An increase in the concentration of sulfate in the subsoil solution (which increased the ionic strength, thereby decreasing the activity of Al3+, and also increased the amount of Al present as the AlSO+4 ion pair) was probably the most important factor decreasing Al toxicity to wheat. The results indicated that gypsum could be used to increase wheat growth in aluminium toxic subsoils in sandy soils of low rainfall regions and that a simple soil test could be used to predict responses.

scholarly journals FÓSFORO NA SOLUÇÃO DO SOLO EM RESPOSTA À APLICAÇÃO DE FERTILIZANTES FLUIDOS MINERAL E ORGANOMINERAL

Irriga ◽  
2015 ◽  
Vol 1 (1) ◽  
pp. 14-27 ◽  
Author(s):  
Dirceu Maximino Fernandes ◽  
Marco André Grohskopf ◽  
Edilson Ramos Gomes ◽  
Natália Rodrigues Ferreira ◽  
Leonardo Teodoro Bull
Keyword(s):  
Electrical Conductivity ◽  
Soil Solution ◽  
Phosphorus Content ◽  
Swine Manure ◽  
Mineral Fertilizer ◽  
Control Treatment ◽  
Shoot Biomass ◽  
Phosphorus Fertilization ◽  
E Mail ◽  
Over Time

FÓSFORO NA SOLUÇÃO DO SOLO EM RESPOSTA À APLICAÇÃO DE FERTILIZANTES FLUIDOS MINERAL E ORGANOMINERAL  DIRCEU MAXIMINO FERNANDES1; MARCO ANDRÉ GROHSKOPF2; EDILSON RAMOS GOMES3; NATÁLIA RODRIGUES FERREIRA2 E LEONARDO TEODORO BÜLL1 1Professor do Programa de Pós-Graduação em Agronomia, – Universidade Estadual Paulista “Júlio Mesquita Filho”, Faculdade de Ciências Agronômicas (UNESP/FCA) - Rua José Barbosa de Barros, no 1780, CEP: 18160-307 - Botucatu, SP, bolsista de produtividade em pesquisa do CNPq. E-mail: [email protected]; [email protected] do Programa de Pós-Graduação em Agronomia (Agricultura) – UNESP/FCA, bolsista CAPES. E-mail: [email protected]; [email protected] do Programa de Pós-Graduação em Agronomia (Irrigação e Drenagem) – UNESP/FCA, bolsista CNPq. E-mail: [email protected].  1 RESUMO Pouco se conhece sobre a dinâmica da solução do solo em resposta a aplicação de diferentes fertilizantes no solo, principalmente, em relação à adubação fosfatada. Nesse sentido, avaliou-se o teor de fósforo, pH e condutividade elétrica na solução do solo e, a produção de biomassa de parte aérea de plantas em resposta a aplicação de fertilizantes fluidos mineral e organomineral a base de dejeto suíno e, mineral sólido. Os tratamentos foram: testemunha geral caracterizada pela ausência de nutrientes, testemunha de fósforo (P) caracterizada pela ausência apenas de P, fertilizantes fluido mineral (MF-P) e organomineral (OF-P) e, sólido (MS-P) aplicados em Latossolo Vermelho distroférrico (LV) e Neossolo Quartzarênico Órtico típico (NQ). O experimento foi conduzido em vasos em casa de vegetação em delineamento experimental de blocos casualizados com quatro repetições. A solução do solo foi captada através de extratores de solução instalados nos vasos, realizando-se dez coletas no período de 137 dias após a aplicação dos fertilizantes, abrangendo dois cultivos consecutivos de aveia preta (cultivo I e cultivo II). Em ambos os solos o rendimento de matéria seca no cultivo I foi maior no OF-P e no cultivo II semelhante no MS-P, MF-P e OF-P, sendo os maiores rendimentos demonstrados no LV em relação ao NQ. Os teores de P na solução do solo variaram ao longo do tempo apenas no OF-P no LV, enquanto que no NQ houve variação em todos os tratamentos, sendo em ambos os solos os maiores teores a partir do cultivo II.  Para os valores de pH e condutividade elétrica (CE) também houve variação ao longo do tempo em ambos os solos, sendo que no pH os valores aumentaram e na CE os valores diminuíram no cultivo II em relação ao cultivo I em todos os tratamentos. Palavras-chave: adubo líquido e sólido, resíduo, esterco.   FERNADES, D. M.; GROHSKOPF, M. A.; GOMES, E. R.; FERREIRA, N. R.; BÜLL, L.T.PHOSPHORUS IN SOIL SOLUTION IN RESPONSE TO THE APPLICATION OF MINERAL AND ORGANOMINERAL FLUID FERTILIZERS  2 ABSTRACT Little is known about the dynamics of soil solution in  response to  the application of different soil fertilizers, mainly in relation to phosphorus fertilization.  Using this approach, the study evaluated phosphorus content, pH and electrical conductivity in soil solution as well as shoot biomass production in response to mineral and organomineral fluid fertilizers containing swine manure and solid mineral.  Treatments were as follows: a control treatment consisting of absence of nutrients, phosphorus (P) control characterized by absence   only of  P, mineral (MF-P) and organomineral (OF-P) fluid fertilizers , and solid mineral fertilizer (SM-P) applied to Oxisol   (LVd) and Typic Quartzipsamments  (TQ) soils. The experiment was carried out   using pots in a greenhouse with a randomized block  experimental design  and  four replicates. Soil solution was collected by solution extractors installed in pots. Ten collections were performed over 137 days after fertilizer application, which included two crops in a row of black oat (cultivation I and cultivation II). In both soils, yield of dry matter in cultivation I was higher in OF-P, and  it was similar in  (SM-P), (MF-P) and (OF-P) in cultivation II. Higher yield was obtained in LVd in relation to TQ.  Phosphorus content in soil solution ranged over time just in OF-P in LVd, whereas  variation was observed in all treatments in TQ. In both soils, higher content was observed as of cultivation II.   Also, variation over time was observed for pH and electrical conductivity (EC) values in both soils. Values of pH increased and values of EC decreased in cultivation II as compared with those in cultivation I in all treatments. Keywords: liquid and solid fertilizer, residue, manure.

scholarly journals IRRIGAÇÃO DE PORTA-ENXERTOS CÍTRICOS COM ÁGUAS SALINAS

Irriga ◽  
2006 ◽  
Vol 11 (3) ◽  
pp. 428-440
Author(s):  
Tales Miler Soares ◽  
Sergio Nascimento Duarte ◽  
Cristiano Nascimento Duarte ◽  
Christiano César Dibbern Graf ◽  
Marcelo Zanetti ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Plant Growth ◽  
Natural Water ◽  
Saline Water ◽  
Calcium Nitrate ◽  
Sao Paulo ◽  
Water Type ◽  
São Paulo ◽  
New Production ◽  
Saline Waters

IRRIGAÇÃO DE PORTA-ENXERTOS CÍTRICOS COM ÁGUAS SALINAS  Tales Miler Soares1; Sergio Nascimento Duarte1; Christiano César Dibbern Graf2; Marcelo Zanetti2; Silvio Sandoval Zocchi31Departamento de Engenharia Rural, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Piracicaba, SP, [email protected] Mudas, Conchal,  SP3Departamento de Ciências Exatas, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Piracicaba, SP  1 RESUMO Avaliar o desenvolvimento dos porta-enxertos limoeiro ‘Cravo’, tangerineira ‘Cleópatra’ e citrumeleiro ‘Swingle’, irrigados com águas salinas, mensurando se a aplicação de Ca(NO3)2 mitiga eventuais efeitos de íons fitotóxicos, foi objetivo do presente trabalho, conduzido sob ambiente protegido, em Rio Claro-SP. Investigou-se três qualidades de água: água natural (CEa= 1,19 dS m-1), explorada de poço tubular profundo, água dessalinizada (CEa= 0,02 dS m-1), obtida mediante osmose reversa da água natural, e água residual (CEa= 2,11 dS m-1), sub-produto da dessalinização. Os níveis de Ca(NO3)2 avaliados foram 0 e 2,105 g L-1. Averiguando-se os parâmetros usuais do crescimento vegetal, não foram observadas diferenças estatísticas, entre os tratamentos, decorrentes da qualidade da água, embora se tenha registrado que esta contribuiu para o aumento da salinização do substrato, ultrapassando, inclusive, o valor da salinidade limiar (CEes= 1,4 dS m-1) reconhecido para os citros. A adição de Ca(NO3)2 não incrementou o desenvolvimento, atuando negativamente no crescimento inicial das raízes e do caule. O curto período necessário ao crescimento dos porta-enxertos, proporcionado pelo atual sistema de produção, associado às irrigações freqüentes e suas frações de lixiviação podem ter restringido efeitos negativos das águas salinas investigadas. UNITERMOS: Citrus, salinidade, condutividade elétrica, substrato.  SOARES, T.M.; DUARTE, S.N.; GRAF, C.C.D.; ZANETTI, M.; ZOCCHI, S.S.       CITRUS ROOTSTOCKS IRRIGATION WITH SALINE WATER  2 ABSTRACT This research aimed to evaluate the growth of three citrus rootstocks (‘Rangpur’ lime, ‘Cleopatra’ mandarin and ‘Swingle’ citrumelo) irrigated with saline waters, under greenhouse conditions, in order to measure if calcium nitrate mitigates their toxic effects. Three water qualities were investigated: natural water (ECw= 1,19 dS m-1), obtained from a deep tubular well, desalinated water (ECw= 0,02 dS m-1), obtained by reverse osmosis from the natural water, and reject water (ECw= 2,11 dS m-1), resultant from the desalination process. Two Ca(NO3)2 levels were evaluated: 0 and 2,105 g L-1. Usual parameters for plant growth analysis were measured. According to Tukey’s test (5% probability), water quality did not affect rootstocks development, although the water type have contributed to increase the electrical conductivity of substrate saturation extract (ECs) along the experimental period, surpassing the salinity threshold value (ECs = 1,4 dS m-1) reported for citrus. The Ca(NO3)2 addition did not increase the plant growth, but negatively affected the first evaluations of root and stem diameter development. The short time necessary to rootstocks growth provided by new production system, associated to the frequent irrigations and its leaching fractions possible may have restricted the negative effects of saline waters. KEYWORDS: Citrus, salinity, electrical conductivity, substrate.  

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