Soil pH and phosphatase activity

Herbien, S. A.; Neal, John L.

doi:10.1080/00103629009368244

Cited by 61 publications

(26 citation statements)

References 24 publications

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“…A ação catalítica desta enzima requer pH na faixa alcalina, como o observado nas áreas cultivadas com Atriplex, o que possivelmente favoreceu a detecção. Segundo Herbien & Neal (1990), o pH do solo pode influenciar a síntese e a liberação das enzimas pelos microrganismos bem como a estabilidade e a conformação dessas substâncias. Frankenberger Junior & Dick (1983) avaliaram 11 enzimas em 10 solos e constataram que a fosfatase alcalina, entre outras, esteve altamente correlacionada com a respiração e a biomassa microbiana no solo, mas não apresentou correlação com a contagem de células.…”

Section: Resultsunclassified

Atividade microbiana em solo do semi-árido sob cultivo de Atriplex nummularia

Pereira

Martínez

Porto

et al. 2004

Pesq. agropec. bras.

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Resumo -Métodos para avaliar a atividade microbiana no solo são fundamentais no monitoramento ambiental de áreas degradadas. O objetivo deste trabalho foi investigar a atividade microbiana de solo do semi-árido cultivado com Atriplex nummularia Lindl. em áreas que receberam rejeito salino durante um e três anos, em comparação com um solo nativo, sem cultivo e não irrigada. O solo cultivado por três anos e que recebeu rejeito salino apresentou, no período seco, valores de pH, CE e atividade de hidrólise do diacetato de fluoresceína (FDA) superiores aos das demais áreas. No entanto, foi observada correlação negativa entre o carbono microbiano e os valores do quociente metabólico (qCO 2 ). A biomassa microbiana e a fosfatase alcalina também foram superiores no solo cultivado por três anos e que recebeu rejeito salino em relação ao solo nativo sem irrigação, confirmando o desempenho de plantas halófitas na melhoria da qualidade do solo sob condições de estresse salino. O cultivo de A. nummularia constitui uma das alternativas para utilização de rejeito salino proveniente da dessalinização por osmose reversa.Termos para indexação: emissão de CO 2 , biomassa microbiana, diacetato de fluoresceína, fosfatase alcalina. Microbial activity in a semiarid soil cultivated with Atriplex nummulariaAbstract -Methods used to estimate the soil microbial activity are important to environmental monitoring of degraded areas. The objective of this research was to investigate the microbial activity of a semiarid soil cultivated with Atriplex nummularia Lindl. in a field receiving saline waste during one and three years, in comparison with an area without crop and irrigation. Soil cultivated during three years presented, during the dry season, values of pH, CE, and activity of FDA hydrolyses higher than those registered in other areas. However, a negative correlation between the microbial carbon and values of qCO 2 was observed. The microbial biomass and the alkaline phosphates were also higher in the three years cultivated soil, in comparison with the native soil, non irrigated, confirming the role of halophytes for enhancing quality of soils under saline stress. Thus, the cultivation of A. nummularia is an alternative for using saline waste from the desalinization process.

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Section: Resultsunclassified

Atividade microbiana em solo do semi-árido sob cultivo de Atriplex nummularia

Pereira

Martínez

Porto

et al. 2004

Pesq. agropec. bras.

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“…It is reported that plant-produced phosphatase is exclusively acid phosphatase (Tarafdar and Claassen, 1988;Tarafdar and Marschner, 1994;George et al 2002). Alkaline phosphatase does not have a plant origin and is produced by bacteria, fungi and earthworms (Hebrien and Neal, 1990).…”

Section: Introductionmentioning

confidence: 99%

Positive feedback between acidification and organic phosphate mineralization in the rhizosphere of maize (Zea mays L.)

Ding

Liu

et al. 2011

Plant Soil

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To test the hypothesis that rhizosphere acidification would enhance the hydrolyzation of organic phosphates by increasing phosphatase activity. A Petri dish experiment with sterile agar and a pot experiment with a low P soil were used. In the Petri dish experiment, roots of each plant were cultured in two compartments, each of which contained agar with one of three nitrogen combinations: NH 4 + /N0 (N0 = nitrogen free), NH 4 + /NO 3 -, and NO 3 -/N0. Phytin was supplied as the sole phosphorus (P) source to all compartments. In the pot experiment, the soil in each pot was treated with N0, KNO 3 , or (NH 4 ) 2 SO 4 ) together with 0 or 75 mg kg −1 phytin-P. Dry weight, P concentration, and P content of roots were highest in the NH 4 + compartments in the Petri dish experiment. In the pot experiment, dry weight, P concentration, and P content of both shoots and roots were higher with NH 4 + than with NO 3 -. NH 4 + treatments reduced rhizosphere pH, promoted the hydrolization of phytin, enhanced acid phosphatase activity in the rhizosphere, and increased phytin-P utilization relative to N0 and NO 3 -treatments. Phosphatase activity was negatively correlated with rhizosphere pH but was positively correlated with plant P content in both experiments. Rhizosphere acidification optimized the activity of acid phosphatase excreted by maize roots and promoted phytin mineralization. NH 4 + -induced acidification in the maize rhizosphere improved the growth of maize roots by improving P uptake from phytin; the improved growth, in turn, increased NH 4 + uptake and acidification.

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“…These enzymes originate either from plant roots (and associated mycorrhiza or other fungi) or from bacteria (Tarafder and Marschner, 1994). Alkaline phosphatases are mainly produced by bacteria, fungi and earthworm (Hebrien and Neal, 1990). These enzymes are frequently referred as ectoenzymes i.e.…”

Section: Phosphatases and Phytase Activitymentioning

confidence: 99%

Soil Enzyme Activity as Affected by Tillage and Residue Management Practices under Diverse Cropping Systems

Saikia¹

2017

Int.J.Curr.Microbiol.App.Sci

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Soil pH and phosphatase activity

Cited by 61 publications

References 24 publications

Atividade microbiana em solo do semi-árido sob cultivo de Atriplex nummularia

Atividade microbiana em solo do semi-árido sob cultivo de Atriplex nummularia

Positive feedback between acidification and organic phosphate mineralization in the rhizosphere of maize (Zea mays L.)

Soil Enzyme Activity as Affected by Tillage and Residue Management Practices under Diverse Cropping Systems

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