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Check the list of papers from NScTI Citrus
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2020
Carr, Natalia Fernandes; Boaretto, Rodrigo M.; Mattos, Dirceu
In: Plant Physiology and Biochemistry, vol. 154, pp. 11-20, 2020, ISSN: 0981-9428.
Abstract | Links | BibTeX | Tags: Amino acids profile, ATPasic activity, Calcium, fertigation, N-use efficiency
@article{Carr2020,
title = {Coffee seedlings growth under varied NO3−:NH4+ ratio: Consequences for nitrogen metabolism, amino acids profile, and regulation of plasma membrane H+-ATPase},
author = {Natalia Fernandes Carr and Rodrigo M. Boaretto and Dirceu Mattos},
doi = {10.1016/J.PLAPHY.2020.04.042},
issn = {0981-9428},
year = {2020},
date = {2020-01-01},
journal = {Plant Physiology and Biochemistry},
volume = {154},
pages = {11-20},
publisher = {Elsevier Masson},
abstract = {Root plasma membrane H+-ATPase electrochemical equilibrium for optimum coffee plant growth can be modulated by specific ammonium:nitrate (NO3−:NH4+) ratio supply. This study aimed to evaluate the coffee seedlings responses to varying ammonium:nitrate (NO3−:NH4+) ratio and to depict how much NO3− and NH4+ plants can use in terms of growth, nitrogen metabolism, amino acids profile and regulation of root plasma membrane H+-ATPase. Coffee plants were grown in nutrient solution with the following NO3−:NH4+ ratios (%): 100:0; 87.5:12.5; 50:50; 0:100. Plants were grown in nutrient solution for 90 days and evaluated for growth, nitrate reductase activity as well as the modulation of H+-ATPase activity in the plasma membrane of the roots, amino acids profile, chlorophyll a fluorescence parameters and estimated cations and anions taken up by plants. The plants treated with the 87.5:12.5 and 50:50 NO3−:NH4+ ratio showed higher ability to absorb nutrients maintaining balanced uptake and as a consequence, 6% and 29%, the highest dry mass yield as compared to the 0:100 NO3−:NH4+ ratio. In addition, plants supplied with the 87.5:12.5 and 50:50 NO3−:NH4+ ratio had respectively, 58% and 94%, greater photosynthetic capability. Those data suggest that farmers and plant nurseries could implement the 50:50 NO3−:NH4+ ratio of nitrogen sources at coffee plantations and seedlings.},
keywords = {Amino acids profile, ATPasic activity, Calcium, fertigation, N-use efficiency},
pubstate = {published},
tppubtype = {article}
}
Root plasma membrane H+-ATPase electrochemical equilibrium for optimum coffee plant growth can be modulated by specific ammonium:nitrate (NO3−:NH4+) ratio supply. This study aimed to evaluate the coffee seedlings responses to varying ammonium:nitrate (NO3−:NH4+) ratio and to depict how much NO3− and NH4+ plants can use in terms of growth, nitrogen metabolism, amino acids profile and regulation of root plasma membrane H+-ATPase. Coffee plants were grown in nutrient solution with the following NO3−:NH4+ ratios (%): 100:0; 87.5:12.5; 50:50; 0:100. Plants were grown in nutrient solution for 90 days and evaluated for growth, nitrate reductase activity as well as the modulation of H+-ATPase activity in the plasma membrane of the roots, amino acids profile, chlorophyll a fluorescence parameters and estimated cations and anions taken up by plants. The plants treated with the 87.5:12.5 and 50:50 NO3−:NH4+ ratio showed higher ability to absorb nutrients maintaining balanced uptake and as a consequence, 6% and 29%, the highest dry mass yield as compared to the 0:100 NO3−:NH4+ ratio. In addition, plants supplied with the 87.5:12.5 and 50:50 NO3−:NH4+ ratio had respectively, 58% and 94%, greater photosynthetic capability. Those data suggest that farmers and plant nurseries could implement the 50:50 NO3−:NH4+ ratio of nitrogen sources at coffee plantations and seedlings.
2019
Quaggio, José A.; Souza, Thais R.; Zambrosi, Fernando C. B.; Mattos, Dirceu; Boaretto, Rodrigo M.; Silva, Guilherme
Citrus fruit yield response to nitrogen and potassium fertilization depends on nutrient-water management system Journal Article
In: Scientia Horticulturae, vol. 249, pp. 329-333, 2019, ISSN: 0304-4238.
Abstract | Links | BibTeX | Tags: Acidification, Ammonium, fertigation, Ionic activity, irrigation, Nitrate, Soil solution
@article{Quaggio2019,
title = {Citrus fruit yield response to nitrogen and potassium fertilization depends on nutrient-water management system},
author = {José A. Quaggio and Thais R. Souza and Fernando C. B. Zambrosi and Dirceu Mattos and Rodrigo M. Boaretto and Guilherme Silva},
doi = {10.1016/J.SCIENTA.2019.02.001},
issn = {0304-4238},
year = {2019},
date = {2019-01-01},
journal = {Scientia Horticulturae},
volume = {249},
pages = {329-333},
publisher = {Elsevier},
abstract = {The objectives of the present study were to investigate the influence of water supply combined with different rates and methods of nitrogen (N) and potassium (K) application on fruit yield and nutrient use efficiency (NutUE) of citrus by monitoring plant nutritional status and soil solution dynamic. The experiment was carried out with 4-yr-old Natal sweet orange trees on Rangpur lime over 4 consecutive growing seasons. Treatments were composed of 2 rates of N and K (NK): 50% and 100% of the recommended rates for maximum yield in rain-fed environments and 3 nutrient-water management systems: non-irrigation + broadcast granular fertilizer, irrigation + broadcast granular fertilizer and fertilizer application via irrigation (fertigation). Fruit yield was maximum under fertigation with application of 50% of the NK rate, and fertigation improved NutUE by 22% compared to non-irrigated trees. However, no difference in productivity and NutUE occurred across nutrient-water management systems under 100% of the NK rate. Differences in plant nutritional were not consistent across treatments and did not contribute to explain variations in fruit yield and NutUE. Soil solution analysis of fertigated trees receiving 100% of the NK rate revealed the lowest pH value and the highest concentration of N-NH 4 . It is concluded that fruit yield responses of citrus trees treated with established NK rates for rain-fed environments might be limited by soil solution acidification and N-NH 4 toxicity when fertilizers are applied via fertigation, being necessary further adjustments on fertilization management of fertigated citrus groves.},
keywords = {Acidification, Ammonium, fertigation, Ionic activity, irrigation, Nitrate, Soil solution},
pubstate = {published},
tppubtype = {article}
}
The objectives of the present study were to investigate the influence of water supply combined with different rates and methods of nitrogen (N) and potassium (K) application on fruit yield and nutrient use efficiency (NutUE) of citrus by monitoring plant nutritional status and soil solution dynamic. The experiment was carried out with 4-yr-old Natal sweet orange trees on Rangpur lime over 4 consecutive growing seasons. Treatments were composed of 2 rates of N and K (NK): 50% and 100% of the recommended rates for maximum yield in rain-fed environments and 3 nutrient-water management systems: non-irrigation + broadcast granular fertilizer, irrigation + broadcast granular fertilizer and fertilizer application via irrigation (fertigation). Fruit yield was maximum under fertigation with application of 50% of the NK rate, and fertigation improved NutUE by 22% compared to non-irrigated trees. However, no difference in productivity and NutUE occurred across nutrient-water management systems under 100% of the NK rate. Differences in plant nutritional were not consistent across treatments and did not contribute to explain variations in fruit yield and NutUE. Soil solution analysis of fertigated trees receiving 100% of the NK rate revealed the lowest pH value and the highest concentration of N-NH 4 . It is concluded that fruit yield responses of citrus trees treated with established NK rates for rain-fed environments might be limited by soil solution acidification and N-NH 4 toxicity when fertilizers are applied via fertigation, being necessary further adjustments on fertilization management of fertigated citrus groves.
2018
Hippler, Franz Walter Rieger; Boaretto, Rodrigo Marcelli; Teixeira, Luiz Antonio Junqueira; Quaggio, José Antonio; Mattos-Jr, Dirceu
Copper supply and fruit yield of young Citrus trees: fertiliser sources and application methods Journal Article
In: Bragantia, vol. 77, iss. 2, pp. 365-371, 2018, ISSN: 0006-8705.
Abstract | Links | BibTeX | Tags: citriculture, fertigation, foliar application, micronutrient, nutritional status
@article{Hippler2018d,
title = {Copper supply and fruit yield of young Citrus trees: fertiliser sources and application methods},
author = {Franz Walter Rieger Hippler and Rodrigo Marcelli Boaretto and Luiz Antonio Junqueira Teixeira and José Antonio Quaggio and Dirceu Mattos-Jr},
url = {http://www.scielo.br/j/brag/a/r5Jvpx8Ny4z7zr5VYZN5mMq/?lang=en},
doi = {10.1590/1678-4499.2017125},
issn = {0006-8705},
year = {2018},
date = {2018-01-01},
journal = {Bragantia},
volume = {77},
issue = {2},
pages = {365-371},
publisher = {Instituto Agronômico de Campinas},
abstract = {ABSTRACT This study aimed to evaluate the fertiliser sources and application methods of copper (Cu) in citrus trees during the first years of fruit production. Two experiments were set up in an orchard with 3-year-old sweet orange trees, which were applied with three sources of Cu (nitrate, sulfate or EDTA) either via fertigation (Experiment 1) or via foliar sprays (Experiment 2). Regardless of the fertiliser source, Cu application via fertigation was not efficacious to increase the micronutrient concentration in leaves and, consequently, did not affect fruit yield. Conversely, foliar application of Cu, either as nitrate or sulfate, increased this nutrient level in leaves but when applied as copper nitrate, visual phytotoxicity symptoms were verified in leaves due to salt accumulation in the plant canopy, which reduced the fruit yield. Considering the plant growth and intensified phytosanitary management of the orchard with the application of copperbased products after the third year of the experiment, the effects of Cu treatments on fruit yield are expected to be negligible as the trees age.},
keywords = {citriculture, fertigation, foliar application, micronutrient, nutritional status},
pubstate = {published},
tppubtype = {article}
}
ABSTRACT This study aimed to evaluate the fertiliser sources and application methods of copper (Cu) in citrus trees during the first years of fruit production. Two experiments were set up in an orchard with 3-year-old sweet orange trees, which were applied with three sources of Cu (nitrate, sulfate or EDTA) either via fertigation (Experiment 1) or via foliar sprays (Experiment 2). Regardless of the fertiliser source, Cu application via fertigation was not efficacious to increase the micronutrient concentration in leaves and, consequently, did not affect fruit yield. Conversely, foliar application of Cu, either as nitrate or sulfate, increased this nutrient level in leaves but when applied as copper nitrate, visual phytotoxicity symptoms were verified in leaves due to salt accumulation in the plant canopy, which reduced the fruit yield. Considering the plant growth and intensified phytosanitary management of the orchard with the application of copperbased products after the third year of the experiment, the effects of Cu treatments on fruit yield are expected to be negligible as the trees age.