Dissolution of phosphate rock in the rhizosphere of five plant species grown in an acid, P-fixing mineral substrate

Hinsinger, Philippe; Gilkes, R. J.

doi:10.1016/s0016-7061(96)00094-8

Cited by 93 publications

(39 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A major process is the decrease in the concentration of phosphate ion (PO 4 ) in the soil solution, which occurs within the rhizosphere as a direct consequence of the removal of P by the root uptake. Such a depletion of rhizosphere P has been reported for various soils and plants 25,26 . This depletion results in a replenishment of P from the solid phase 27 , with growing period and P concentration and is infl uenced by the physicochemical conditions of the soil.…”

Section: Discussionsupporting

confidence: 53%

Ability of Emericella rugulosa to mobilize unavailable P compounds during Pearl millet [Pennisetum glaucum (L.) R. Br.] crop under arid condition

Yadav

Tarafdar

2007

Indian J Microbiol

View full text Add to dashboard Cite

Phosphate solubilizing microorganisms are ubiquitous in soils and could play an important role in supplying P to plants where plant unavailable P content in soil was more. A phosphatase and phytase producing fungus Emericella rugulosa was isolated and tested under fi eld condition (Pearl millet as a test crop) in a loamy sand soil. In the experimental soil 68% organic phosphorous was present as phytin; less than 1% of phosphorous was present in a plant available form. The maximum effect of inoculation on different enzyme activities (acid phosphatase, alkaline phosphatase, phytase, and dehydrogenase) was observed between 5 and 8 weeks of plant age. The depletion of organic P was much higher than mineral and phytin P. The microbial contribution was signifi cantly higher than the plant contribution to the hydrolysis of the different P fractions. A signifi cant improvement in plant biomass, root length, seed and straw yield and P concentration of root and shoot resulted from inoculation. The results suggest that Emericella rugulosa produces phosphatases and phytase, which mobilize P and enhance the production of pearl millet.

show abstract

Section: Discussionsupporting

confidence: 53%

Ability of Emericella rugulosa to mobilize unavailable P compounds during Pearl millet [Pennisetum glaucum (L.) R. Br.] crop under arid condition

Yadav

Tarafdar

2007

Indian J Microbiol

View full text Add to dashboard Cite

show abstract

“…For example, the difference between the pH in the rhizosphere soil and in the bulk soil can be up to two pH units (38,52). This acidification of the rhizospheric soil results from the production of CO 2 during respiration, from the release of organic compounds in the root exudates (13,22,25,57), and from the balance of ion charges within the roots which depends on the excretion of one H ϩ ion for every cation absorbed (20). These modifications of physicochemical conditions in the rhizosphere make the cations from the minerals more accessible to the plant (11,19,46).…”

Section: Discussionmentioning

confidence: 99%

Root-Associated Bacteria Contribute to Mineral Weathering and to Mineral Nutrition in Trees: a Budgeting Analysis

Calvaruso

Turpault²,

Frey‐Klett

2006

Appl Environ Microbiol

191

101

View full text Add to dashboard Cite

The principal nutrient source for forest trees derives from the weathering of soil minerals which results from water circulation and from plant and microbial activity. The main objectives of this work were to quantify the respective effects of plant-and root-associated bacteria on mineral weathering and their consequences on tree seedling growth and nutrition. That is why we carried out two column experiments with a quartz-biotite substrate. The columns were planted with or without pine seedlings and inoculated or not with three ectomycorrhizosphere bacterial strains to quantify biotite weathering and pine growth and to determine how bacteria improve pine growth. We showed that the pine roots significantly increased biotite weathering by a factor of 1.3 for magnesium and 1.7 for potassium. We also demonstrated that the inoculation of Burkholderia glathei PML1(12) significantly increased biotite weathering by a factor of 1.4 for magnesium and 1.5 for potassium in comparison with the pine alone. In addition, we observed a significant positive effect of B. glathei PMB1(7) and PML1(12) on pine growth and on root morphology (number of lateral roots and root hairs). We demonstrated that PML1(12) improved pine growth when the seedlings were supplied with a nutrient solution which did not contain the nutrients present in the biotite. No improvement of pine growth was observed when the seedlings were supplied with all the nutrients necessary for pine growth. We therefore propose that the growth-promoting effect of B. glathei PML1(12) mainly resulted from the improved plant nutrition via increased mineral weathering.In ecosystems with low inputs and without any fertilization or soil amendment by humans, the nutrients available to plants come from atmospheric inputs and weathering of soil minerals. This is mainly the case with forest ecosystems which, in addition, are frequently located on poor and acidic soils (3). Plants developing on acidic soils are subjected to two major constraints: (i) high concentrations of ions like Al 3ϩ and H ϩ which inhibit root growth and (ii) low mineral nutrient availability as a result of low reserves and impaired uptake due to high H ϩ concentrations (40).In temperate and boreal forest ecosystems, the vast majority of trees live in close association with symbiotic fungi, the ectomycorrhizal fungi, which connect tree roots to the soil environment via a broad network of hyphae. These fungi contribute to plant nutrition by carrying far away from the roots and from very small pores, the water and the nutrients they released by weathering the primary minerals (30, 59). In addition, the ectomycorrhizal symbiosis modifies root exudation qualitatively and quantitatively by changing the metabolic functions of the roots (34, 51, 56). It creates a special environment called mycorrhizosphere, where the bacterial equilibrium is different from that of the bulk soil (soil without any influence of roots) (36). These modifications of the bacterial equilibrium in the mycorrhizosphere are likely to contribut...

show abstract

“…The only exception was Ca, because, in general, legumes have higher Ca content than grasses (Hinsinger and Gilkes, 1997;Li et al, 2004;Volz and Jacobson, 1977) and, soybean plants, in particular, are more efficient than maize plants in terms of Ca uptake from soil solution (Caires et al, 2011). Maize nutrient export was not influenced (p < 0.05) by the tillage or the fertiliza- tion treatments.…”

Section: Nutrient Exportmentioning

confidence: 99%

Tillage, fertilization systems and chemical attributes of a Paleudult

Dorneles¹,

Lisboa²,

Abichequer³

et al. 2015

Sci. agric. (Piracicaba, Braz.)

View full text Add to dashboard Cite

Tillage and fertilization methods may affect soil fertility. With the aim of assessing changes in soil chemical properties over a period of ten years, soil samples of a Paleudult were collected over nine seasons at three layer depths (0-5, 5-10, 10-20 cm) and were chemically analyzed. Grain yield and nutrient export in two summer crops, soybean (Glycine max) and corn (Zea mays), in a field experiment set in Eldorado do Sul, in the state of Rio Grande do Sul, Brazil, were determined. Three soil tillage systems were evaluated, conventional (CT), reduced (RT) and no-tillage (NT), combined with mineral (lime and fertilizers) and organic (poultry litter) fertilization.The no-tillage system stood out as compared to the others, especially in the surface layer, in terms of values of organic matter, soil pH, available phosphorus, cation exchange capacity and base saturation. Phosphorus content was higher under organic than mineral fertilization due to the criteria used for the establishment of fertilizer doses. Under organic fertilization, soil pH values were similar to those obtained in limed soil samples because of the cumulative effect of the organic fertilizer. Soybean yield was lower under NT in comparison to the RT and CT systems.Consequently, soybean grain exported a lower content of nutrients than maize grain. Maize yield was not affected by either tillage or fertilization systems.

show abstract

Dissolution of phosphate rock in the rhizosphere of five plant species grown in an acid, P-fixing mineral substrate

Cited by 93 publications

References 25 publications

Ability of Emericella rugulosa to mobilize unavailable P compounds during Pearl millet [Pennisetum glaucum (L.) R. Br.] crop under arid condition

Ability of Emericella rugulosa to mobilize unavailable P compounds during Pearl millet [Pennisetum glaucum (L.) R. Br.] crop under arid condition

Root-Associated Bacteria Contribute to Mineral Weathering and to Mineral Nutrition in Trees: a Budgeting Analysis

Tillage, fertilization systems and chemical attributes of a Paleudult

Contact Info

Product

Resources

About