Effects of phosphorus and organic fertilizers on phosphorus fractions in submerged soil

Os solos de várzea, sazonalmente alagados para o cultivo do arroz, apresentam alternância nas condições de oxidação e redução, que determinam modificações intensas na fase sólida mineral do solo e na dinâmica de elementos reativos, como o fósforo. Este estudo teve como objetivo avaliar o efeito da drenagem de dois solos de várzea, (Planossolo Háplico e Chernossolo Ebânico), após período de alagamento sobre a capacidade máxima de adsorção de fósforo (CMAP). O experimento foi conduzido em casa de vegetação, o fator sistema foi composto por dois níveis: 1) solos alagados por 63 dias seguido de drenagem e após manteve-se a umidade em 16% Ug por 184 dias; 2) solos mantidos com umidade de 16% Ug durante todo o período do experimento. Após a drenagem foram feitas coletas de solo nos tempos zero, 36, 66, 96 e 184 dias para determinação da CMAP. A determinação da CMAP foi feita por meio do ajuste de isotermas de adsorção segundo o modelo de Langmuir. O comportamento da CMAP após a drenagem do solo foi diferente para as duas classes de solo avaliadas. O Planossolo demonstrou tendência de redução imediata da CMAP após a drenagem do solo, no caso do Chernossolo, houve tendência de manutenção de valores elevados da CMAP logo após a drenagem, com posterior início da redução. A drenagem dos solos após período de alagamento aumenta a capacidade máxima de adsorção de fósforo, sendo que este efeito perdura por 163 dias para o Chernossolo e 121 dias para o Planossolo.Palavras-chave: alagamento; redução; isoterma de Langmuir. ABSTRACT RESUMO Phosphorus adsorption after drainage in two soil classes 1Lowland soils, seasonally flooded for rice cultivation, feature alternate oxidation and reduction conditions, which determine intense modifications in the soil mineral solid phase and in the dynamics of highly reactive elements, such as phosphorus. This study aimed to evaluate the effect of drainage of two lowland soils (Albaqualf and Argiaquoll) after a flooding period on the maximum phosphorus adsorption capacity (MPAC). The experiment was conducted in a greenhouse, and the system factor was composed of two levels: 1) flooded soil for 63 days, followed by drainage, and then humidity remained at 16% for 184 days; 2) soil moisture maintained at 16% throughout the trial period. After drainage, soil samples were collected at 0, 36, 96 and, 184 days for MPAC determination, which was performed by the adjustment of adsorption isotherms according to the Langmuir model. The behavior of MPAC after soil drainage was different for both soil classes evaluated. An immediate reduction of maximum phosphorus adsorption capacity was seen after drainage in the case of Albaqualf, while for Argiaquoll, there was a tendency to maintain higher values of MPAC after drainage, with subsequent reduction. Soil drainage after a flooding period increases de maximum phosphorus adsorption capacity, and this effect remains for approximately 163 days in Argiaquoll and 121 days in Albaqualf soils.

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“…These results agree with those from Abolfazli et al (2012), in which P adsorption in acid soils occurred preferentially in the iron fractions.…”

Section: Resultssupporting

confidence: 92%

Phosphorus adsorption after drainage in two soil classes

2018

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“…HCl-Pi distribution decreased from 89% in control to 69% and 42% in 2 and 4% vermicompost treatments (Figure 4). Calcium phosphates are thermodynamically the most stable P minerals, although they were found to decrease in greenhouse studies (Guo et al, 2000;Uygur and Karabatak, 2009).The result is similar to the study of Abolfazli et al (2012) who reported that Ca-P mineral reduced following application of cow dung manure. in amended and non-amended soil, calcium phosphate minerals comprised the largest fraction of soil Pi indicating that the added P was transformed into the stable Ca-P minerals at the end of the experiment.…”

Section: The Pi Extracted By Naoh Is Considered As Pi Associatedsupporting

confidence: 83%

The effects of some humic substances and vermicompost on phosphorus transformation rate and forms in a calcareous soil

Mehrizi

Sarcheshmehpour

Ebrahimi

2015

J. Soil Sci. Plant Nutr.

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The role of some humic substances (HS) on phosphorus (P) bioavailability and fractions was investigated in a greenhouse study using a calcareous soil from Eastern, Iran. Soils were treated with two levels (2 and 4%) of Humic Acid (HA), Fulvic acid (FA), Vermicompost (Verm) and their mixtures including FA+HA and FA+HA+Verm, and incubated for 24, 360, 720 and 1080 h. The Olsen-P was determined in amended and nonamended soils after incubation time. The P release was modeled by Parabolic, Power and Elovich equations to determine the transformation rates. Since the maximum P release was found in vermicompost treated soil, P was sequentially extracted with H 2 O, NaHCO 3 , NaOH and HCl at 24 and 1080h after incubation. The highest released P was measured in vermicompost treatment and decreased as follows: HA+FA+Verm>HA+FA>HA>FA>CO. The decrease of P release data was best described by Parabolic equation (r 2 =0.83-0.93, SE=0.51-2.91). Higher transformation indices of vermicomopost amended soil than other treatments showed more efficiency of vermicompost to release of phosphorus in soil. H 2 O-P, NaHCO 3-P and NaOH-P increased after vermicompost application and converted to HCl-P fraction so that at the end of the experiment, calcium phosphates comprised 69 and 43% of inorganic P (Pi) at 2 and 4% vermicomopost treatments, respectively. Results of the study showed that humic substances could increase P extractability and availability in soil.

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“…It maintains biochemical, metabolic functions in plants; maintains soil fertility and soil health [3]. But lower phosphorus use efficiency limits crop yield and economic return [4].…”

Section: Introductionmentioning

confidence: 99%

Rhizosphere Effect of Kharif Crops on Phosphatases and Dehydrogenase Activities in a Typic Haplustert

Dotaniya

Kushwah

Rajendiran

et al. 2014

Natl. Acad. Sci. Lett.

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In recent years phosphorus crisis is emerging at global level, every country in the world searching for alternative sources and management options for increasing its supply and use efficiency. Increasing cost of cultivation due to phosphatic fertilizers, attracting our mind towards it. In this experiment it was focused on effect of major kharif crops (maize, soybean, sorghum, pearl millet, finger millet and rice) on phosphatases and dehydrogenase activities in soil at different crop growth periods (30, 50, 75, 90 days after sowing and at crop harvest). Acid phosphatase activity varied crop wise and also at different crop growth periods. The maximum acid phosphatase activities were observed at 75 DAT in rice (0.206 mg PNP/g h), 90 DAS in sorghum (0.194 mg PNP/g h) and pearl millet (0.201 mg PNP/g h), 50 DAS in soybean (0.127 mg PNP/g h), and 30 DAS in maize (0.154 mg PNP/g h) and, 50 DAS as well as 75 DAS in finger millet (0.180 mg PNP/g h), respectively. But alkaline phosphatase activities were maximum at 75 days after sowing in all the crops i.e. sorghum (0.533 mg PNP/g h), soybean (0.465 mg PNP/g h), rice (0.440 mg PNP/g h), maize (0.538 mg PNP/g h), pearl millet (0.546 mg PNP/g h) and finger millet (0.530 mg PNP/g h), respectively. The dehydrogenase activities were also higher in 75 days after sowing in all the crops. These enzyme activities associated with higher availability and uptake of phosphorus.

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Effects of phosphorus and organic fertilizers on phosphorus fractions in submerged soil

Cited by 54 publications

References 27 publications

Phosphorus adsorption after drainage in two soil classes

Phosphorus adsorption after drainage in two soil classes

The effects of some humic substances and vermicompost on phosphorus transformation rate and forms in a calcareous soil

Rhizosphere Effect of Kharif Crops on Phosphatases and Dehydrogenase Activities in a Typic Haplustert

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