Distribuição de fósforo no bulbo molhado, aplicado via fertirrigação por gotejamento com ácido fosfórico

Zanini, José Renato; Barreto, Ana K. G.; Foratto, Letícia Cecília; Natale, William

doi:10.1590/s0100-69162007000100012

Cited by 10 publications

(11 citation statements)

References 12 publications

(11 reference statements)

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“…The ammonium and the urea amidic salts showed acid behavior, which occurs due to the ammonium ion nitrification, causing the release of hydrogen ions, which will reduce the soil pH (MELO, 1987). The phosphoric acid has been widely used in fertigation; beyond being a good source of phosphorus it reduces the water pH, avoiding the precipitation of phosphorus by calcium (ZANINI et al, 2007). LEAL et al (2007) Except for isolated cases observed in C4 concentration, at 44 days after transplanting, we observed that the applied fertilizer concentrations showed pH values above the average (5.0), especially the C4 concentration that reached pH values above 7.0 ( Figure 2B).…”

Section: Resultsmentioning

confidence: 47%

Watermelon fertigation with electrical conductivity and ph monitoring in the soil solution

Júnior

Viana²,

Medeiros

et al. 2016

Eng. Agríc.

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ABSTRACT:In the olericulture, in general, is practiced intensive fertilization, which creates a risk of salinization and change of high pH, which if not well monitored can cause production losses, excessive spending on fertilizers and environmental contamination. We developed this study with the aim of controlling fertigation on watermelon through the behavior of the electrical conductivity (EC) and pH in the soil solution obtained through porous ceramic cups extractors. The EC and pH values were corrected by the current soil moisture for the moisture field capacity, due to different moisture values at the time of extraction. The monitoring comprised 19 assessments d uring 80 days of cultivation. We can control the pH and EC of the soil and maintain them at optimal levels for the crop through real-time monitoring of the soil solution. The monitoring enabled the achievement of a balanced fertigation.

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Section: Resultsmentioning

confidence: 47%

Watermelon fertigation with electrical conductivity and ph monitoring in the soil solution

Júnior

Viana²,

Medeiros

et al. 2016

Eng. Agríc.

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“…It is observed that the treatment with 0% WR the concentration of P is somewhat distributed in the soil profile, moreover, tended to concentrate in a small region corresponding to the location that was added in the furrow ( Figure 4A). According Zanini et al (2007) phosphorus has mobility its limitations when applied in solid form, as in fertigation conditions motion can reach 0.20 m in depth so as along the surface.…”

Section: Resultsmentioning

confidence: 99%

Distribution of Nutrients in Profile of a Latosol Subsurface Drip via Fertigated

Silva

Cunha

Teixeira

et al. 2017

RBAI

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It is important to follow the dynamics and distribution of nutrients in the soil profile in crops with fertigation. This practice allows you to establish or adjust the appropriate application of fertilizers and management of irrigation water, and it can prevent environmental damage such as soil salinization and contamination of ground water and surface water sources. Starting from the hypothesis that the increase in water depth extends the distribution of nutrients in the soil solution, is aimed in this work to study the dynamics and distribution of nutrients P, K, Mg and Ca in the profile of an Latosol fertilized via drip subsurface cultivated with sugarcane. The experiment was carried out in the experimental area belonging to the Federal Institute Goiano -Campus Rio Verde, GO. The experimental design was a randomized block design with four replications. The factors analyzed were three levels of fluid replacement (0, 50 and 100% of field capacity). Soil samples were collected after fertigation installment of finish using a ring with dimensions of 0.05 x 0.05 cm in diameter. Sampling proceeded depth by depth in equidistant grid points of 0.05 x 0.05 m on a profile of 0.40 x 0.40 cm samples totaling 96 in all treatments. The increase in water depth increased amplitude distribution of nutrients in the soil profile thereby increasing the availability of nutrients to the root uptake.

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“…Observou-se que, quanto maior a fração de P aplicada via fertirrigação, maior foi o teor final de P no solo, sobretudo a uma distância lateral do gotejador de até 10 cm, e profundidade de até 20 cm, com maiores teores no ponto de gotejamento. Segundo Zanini et al (2007) e Shedeed et al (2009), a aplicação parcelada e frequente de P via fertirrigação por gotejamento possibilita o movimento do nutriente no solo por fluxo de massa, tanto lateralmente quanto em profundidade. Além disso, os teores médios de P em todo o perfil do solo foram similares nos tratamentos com 100% do P em pré-plantio (38 mg dm -3 ) e com 50% do P via fertirrigação (35 mg dm -3 ), porém, respectivamente 43 e 48% menores do que o teor médio de P no tratamento com 100% do P via fertirrigação (67 mg dm -3 ).…”

Section: Variávelunclassified

Frações ótimas da adubação com fósforo no pré-plantio e na fertirrigação por gotejamento de tomateiro

Marouelli

Guimarães

Braga

et al. 2015

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi estabelecer frações ótimas da dosagem total de fósforo, a serem aplicadas no pré-plantio e na fertirrigação do tomateiro de crescimento determinado, bem como determinar o efeito das diferentes formas de aplicação do nutriente sobre sua distribuição espacial no solo. Os tratamentos consistiram de cinco esquemas de aplicação do fertilizante: 100, 75, 50, 25 e 0% da dose total de P, dividida entre o pré-plantio (superfosfato triplo incorporado ao solo) e a fertirrigação (ácido fosfórico). O experimento foi realizado em Latossolo Vermelho argiloso com duas classes de disponibilidade de P -7,5 e 32,9 mg dm -3 (Mehlich-1). Os tratamentos não apresentaram efeito sobre as variáveis de produção do tomateiro cultivado no solo com alta disponibilidade de P. Entretanto, no solo com menor disponibilidade do nutriente, a fertirrigação com P apresentou efeito quadrático sobre a produtividade de frutos, a receita líquida e a taxa líquida de retorno. Os melhores resultados foram obtidos com a aplicação de metade da dose total de P pela fertirrigação. A fertirrigação possibilitou movimento vertical do nutriente no solo para até 30 cm de profundidade, e movimento horizontal de até 15 cm.Termos para indexação: Solanum lycopersicum, análise econômica, crescimento determinado, distribuição espacial no solo, parcelamento da adubação, tomate para processamento. Optimal fractions of phosphorus fertilizer applied in preplanting and in drip fertigation of tomato cropAbstract -The objective of this work was to establish the optimal fractions of the total amount of phosphorus to be applied in preplanting and in drip fertigation of determinate-growth tomato, as well as to determine the effect of the different forms of nutrient application on their soil spatial distribution. Treatments consisted of five schemes of fertilizer application: 100, 75, 50, 25, and 0% of P total dose divided between the pre-planting (triple superphosphate in band placement) and the fertigation (phosphoric acid). The experiment was carried out in a clayed Oxisol with two P availability classes -7.5 and 32.9 mg dm -3 (Mehlich-1). The treatments showed no effect on tomato production variables in the soil with high P availability. However, in the soil with smaller availability of the nutrient, P fertigation showed a quadratic effect on fruit yield, net income, and net rate of return. The best results were obtained with half of the P total dose applied by fertigation. The fertigation allowed P movement in the soil up to 30 cm deep, and horizontal movement up to 15 cm.

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Distribuição de fósforo no bulbo molhado, aplicado via fertirrigação por gotejamento com ácido fosfórico

Cited by 10 publications

References 12 publications

Watermelon fertigation with electrical conductivity and ph monitoring in the soil solution

Watermelon fertigation with electrical conductivity and ph monitoring in the soil solution

Distribution of Nutrients in Profile of a Latosol Subsurface Drip via Fertigated

Frações ótimas da adubação com fósforo no pré-plantio e na fertirrigação por gotejamento de tomateiro

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