Pasture degradation decreases organic P content of tropical soils due to soil structural decline

Geoderma ◽  
2015 ◽  
Vol 257-258 ◽  
pp. 123-133 ◽  
Author(s):  
Maike Nesper ◽  
Else K. Bünemann ◽  
Steven J. Fonte ◽  
Idupulapati M. Rao ◽  
Jaime E. Velásquez ◽  
...  
Keyword(s):  
Tropical Soils ◽  
Organic P ◽  
P Content ◽  
Pasture Degradation

scholarly journals Mineralogy and Maximum Phosphorus Adsorption Capacity in Soybean Development

2018 ◽  
Vol 10 (7) ◽  
pp. 242
Author(s):  
Reginaldo De Oliveira ◽  
Laércio Santos Silva ◽  
Naiara Fernanda de Souza ◽  
Marizane Pietroski ◽  
Gustavo Caione ◽  
...  
Keyword(s):  
Clay Fraction ◽  
Tropical Soils ◽  
Dry Mass ◽  
Natural Fertility ◽  
Phosphorus Adsorption ◽  
Aluminum Oxides ◽  
P Content ◽  
Randomized Experimental Design ◽  
Negative Impacts ◽  
Phosphorus Application

The low natural fertility of tropical soils and the mineralogy almost dominated by iron and aluminum oxides limit the availability of phosphorus (P) to the plants, causing negative impacts on soybean yield. Objective was to evaluate the effect of phosphate fertilization on soils with different maximum phosphorus adsorption capacities (PAC) in soybean development. The experiment was carried out under greenhouse conditions, using Red-yellow Latosol (RYL) and a Typic Hapludalf (TH) soil as substrate. The analyses were performed by a completely randomized experimental design in a 5 × 2 factorial arrangement with three replications. The treatments consisted of 5 doses of P applied, corresponding to 0, 1, 6, 12, and 24% of PAC of each soil. In the soil, the mineralogy of the clay fraction (hematite, goethite, gibbsite and kaolinite) and crystallographic attributes were characterized. In the plant, we evaluated growth and pod production. The PAC of the soils ranged from 220 to 650 mg dm-3 with higher value in the RYL associated to clayey oxidic mineralogy and texture in relation to the TH of kaolinite origin and sandy texture, where the higher energy of adsorption observed was to TH. Phosphorus application from 16 to 21% of PAC, independently of the soil, promotes the same pattern of response with improvements in soybean development evidenced by increases in P content in plant tissue, plant height, root volume and aerial dry mass.

ORGANIC AND INORGANIC P CONTENT, MOVEMENT AND MINERALIZATION OF P IN SOIL BENEATH A FEEDLOT

1975 ◽  
Vol 55 (4) ◽  
pp. 457-466 ◽  
Author(s):  
L. B. CAMPBELL ◽  
G. J. RACZ
Keyword(s):  
Field Capacity ◽  
Organic P ◽  
Field Soil ◽  
Inorganic P ◽  
Sample Depth ◽  
Extractable P ◽  
P Content ◽  
Field Samples ◽  
Adjacent Field ◽  
Depth Water

Greater amounts of 0.5 M NaHCO3 and water-extractable P were found in soil beneath a cattle feedlot located on an alkaline sandy soil than in soil in an adjacent non-manured field. The 0.5 M NaHCO3-extractable P contents of the feedlot soil samples were greater than for the adjacent field to a depth of 120–150 cm, suggesting that P from the manure had moved to this depth. Water extracted very little P from all field samples and the feedlot samples obtained below 120 cm. Concentration of total P in the feedlot soil was usually greater than in the corresponding field soil. The field soil contained more organic P than the feedlot soil at depths of 0–90 cm. Organic P concentrations at the 0 to 15-cm depths were 268 and 56 ppm for the field and feedlot sites, respectively. The organic C:N:P ratios for the 0 to 15-cm feedlot and field samples were 214:18:1 and 132:8.7:1, respectively. Mineralization of organic P in laboratory experiments was greater in flooded soils than in soils maintained at field capacity. Rates of mineralization were greater for manured than for non-manured samples. Organic and inorganic P moved at about equal rates in soil treated with manure extract. Rates of movement of both decreased with increasing sample depth in the feedlot soil. The feedlot soil below 30 cm and the field soils exhibited a high potential for inorganic and organic P fixation. Organic and inorganic P applied as manure extract moved faster than an equivalent concentration of P as KH2PO4.

Spectral sensitivity of solution 31P NMR spectroscopy is improved by narrowing the soil to solution ratio to 1:4 for pasture soils of low organic P content

Geoderma ◽  
2015 ◽  
Vol 257-258 ◽  
pp. 48-57 ◽  
Author(s):  
Timothy I. McLaren ◽  
Ronald J. Smernik ◽  
Richard J. Simpson ◽  
Michael J. McLaughlin ◽  
Therese M. McBeath ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Spectral Sensitivity ◽  
31P Nmr ◽  
31P Nmr Spectroscopy ◽  
Organic P ◽  
P Content ◽  
Solution 31P Nmr Spectroscopy

scholarly journals ORGANIC PHOSPHORUS FRACTIONS IN SOIL FERTILIZED WITH CATTLE MANURE

2015 ◽  
Vol 39 (1) ◽  
pp. 140-150 ◽  
Author(s):  
Lucas Boscov Braos ◽  
Mara Cristina Pessôa da Cruz ◽  
Manoel Evaristo Ferreira ◽  
Fernando Kuhnen
Keyword(s):  
Exchange Resin ◽  
Organic Phosphorus ◽  
Tropical Soils ◽  
Inorganic Phosphorus ◽  
Cattle Manure ◽  
Available P ◽  
P Availability ◽  
Organic P ◽  
Soil Material ◽  
Sampling Times

Inorganic phosphorus (Pi) usually controls the P availability in tropical soils, but the contribution of organic P (Po) should not be neglected, mainly in systems with low P input or management systems that promote organic matter accumulation. The aims of this study were to evaluate the changes in the Po fractions over time in soil fertilized and not fertilized with cattle manure and to correlate Po forms with available P extracted by anion exchange resin. The experiment was carried out under field conditions, in a sandy-clay loam Haplustox. The experimental design was a 2 × 9 randomized complete block factorial design, in which the first factor was manure application (20 t ha-1) or absence, and the second the soil sampling times (3, 7, 14, 21, 28, 49, 70, 91, and 112 days) after manure incorporation. Labile, moderately labile and non-labile Po fractions were determined in the soil material of each sampling. Manure fertilization increased the Po levels in the moderately labile and non-labile fractions and the total organic P, but did not affect the Po fraction proportions in relation to total organic P. On average, 5.1 % of total Po was in the labile, 44.4 % in the moderately labile and 50.5 % in the non-labile fractions. Available P (resin P) was more affected by the manure soluble Pi rather than by the labile Po forms. The labile and non-labile Po fractions varied randomly with no defined trend in relation to the samplings; for this reason, the data did not fit any mathematical model.

Accumulation and phosphatase-lability of organic phosphorus in fertilised pasture soils

2007 ◽  
Vol 58 (1) ◽  
pp. 47 ◽  
Author(s):  
Timothy S. George ◽  
Richard J. Simpson ◽  
Paul A. Hadobas ◽  
David J. Marshall ◽  
Alan E. Richardson
Keyword(s):  
Organic Phosphorus ◽  
Trifolium Subterraneum ◽  
Organic P ◽  
Wild Type ◽  
P Nutrition ◽  
P Content ◽  
Extracellular Phytase ◽  
Fertiliser Application ◽  
And Control ◽  
Water Extractable

The accumulation and phosphatase-lability of organic P was investigated in soil taken from 3 pastures that had received contrasting fertiliser management over 8 years. The soils were either unfertilised or had received superphosphate either from 1994 to 1997 or applied annually to 2002. P-fertilisation led to an increase in both the inorganic and organic P content of the soils, but with differences in the distribution of organic P in various extractable pools. Fertilisation also affected the amount of organic P that was amenable to hydrolysis by a non-specific phosphatase. In particular, the amount of water-extractable organic P that was phosphatase-labile was greatest in soil that had received continuous fertiliser application. Despite improved phosphatase-lability of different organic P pools in the fertilised soils, transgenic Trifolium subterraneum L., which releases extracellular phytase, showed no consistent advantage in growth and P nutrition compared with either wild-type or azygous controls when grown in intact cores of soil. This indicates that organic P that accumulates with P-fertilisation is either not an effective substrate for transgenic plants that exude phytase or is equally available to transgenic and control plants.

Relationship between vertical distributions of Bray II P content and organic P content in the Ap horizon of paddy rice fields

2006 ◽  
Vol 52 (5) ◽  
pp. 654-661 ◽  
Author(s):  
Ikuko Akahane ◽  
Naoko Sasaki ◽  
Masami Nanzyo ◽  
Tadashi Takahashi ◽  
Takashi Tashiro ◽  
...  
Keyword(s):  
Paddy Rice ◽  
Rice Fields ◽  
Organic P ◽  
P Content ◽  
Ap Horizon ◽  
Vertical Distributions

DISTRIBUTION AND PROPERTIES OF ORGANIC FRACTIONS IN SELECTED ALBERTA SOILS

1969 ◽  
Vol 49 (1) ◽  
pp. 129-141 ◽  
Author(s):  
L. E. Lowe
Keyword(s):  
Humic Acid ◽  
Organic Matter Content ◽  
Matter Content ◽  
Organic P ◽  
Soil Zone ◽  
Electrophoretic Behavior ◽  
P Content ◽  
Organic Fractions ◽  
Carbohydrate Components ◽  
And Behavior

Nine soils, representing the dominant groups in the major soil zones of Alberta, were characterized with respect to the distribution and selected properties of organic fractions. Detailed results are presented only for A horizon samples. Well humified materials in surface horizons exhibited remarkable similarities despite the range of conditions under which they accumulated.In general, differences between organic components of soils within a soil zone were much less distinct than differences between soil zones. In the sequence Gray Wooded to Black to Brown soil zones, Ah horizons showed decreasing organic matter content, decreasing hexose and pentose content, but little change in organic P content or hexose as percent of total organic matter.De-ashed humic acid fractions showed little variation between soils with respect to elemental composition, functional groups, amino acid and carbohydrate components, electrophoretic behavior or infrared, spectra. Optical properties and behavior toward electrolytes of humic acid solutions showed some differences between soil zones.

scholarly journals Phosphorus fractions in soil after successive crops of Pinus taeda L. without fertilization

2017 ◽  
Vol 47 (7) ◽  
Author(s):  
Luciano Colpo Gatiboni ◽  
Cristiane Ottes Vargas ◽  
Jackson Adriano Albuquerque ◽  
Jaime Antonio Almeida ◽  
James Stahl ◽  
...  
Keyword(s):  
Pinus Taeda ◽  
Soil Samples ◽  
Phosphorus Fractions ◽  
Chemical Fractionation ◽  
P Availability ◽  
Organic P ◽  
The Third ◽  
P Content ◽  
Inorganic P Fractions ◽  
Pinus Taeda L

ABSTRACT: Pinus cultivation without fertilization is a common practice in southern Brazil, which can induce a decline in the availability of phosphorus (P) in the soil. The purpose of this study was to evaluate the changes in phosphorus fractions in a Humic Cambisol subjected to continuous Pinus taeda L. cultivation without fertilization. Two forest stands were evaluated, after 16 years of Pinus cultivation (1st crop) and 49 years (3rd crop), when soil samples were collected (layers 0-10, 10-20, 20-40, 40-60, and 60-80cm) from six trenches per forest. In soil samples, the P contained in organic (Po) and inorganic (Pi) forms was determined by sequential chemical fractionation. Labile inorganic P fractions remained unchanged after the different cultivation periods. However, the labile organic fractions declined from the first to the third cycle (from 70.6 to 39.8mg dm-3 in the 0-10cm layer), indicating that these forms influence the buffering capacity of labile Pi. The moderately labile organic P acted as a P drain, increasing its percentage of the total, from 34.7 to 56.3%, from the first to the third crop. Soil cultivation for 49 years with Pinus taeda resulted in a reduction of the organic P content, indicating that for this soil use, this P form should be used to diagnose P availability and fertilization requirements.

THE DISTRIBUTION OF ORGANIC PHOSPHORUS IN BRITISH COLUMBIA SOILS AND ITS RELATIONSHIP TO SOIL CHARACTERISTICS

1965 ◽  
Vol 45 (1) ◽  
pp. 87-95 ◽  
Author(s):  
M. K. John ◽  
P. N. Sprout ◽  
C. C. Kelley
Keyword(s):  
Organic Phosphorus ◽  
Chemical Properties ◽  
The Other ◽  
Organic P ◽  
Significant Relationships ◽  
P Content ◽  
Wide Range ◽  
Relationship Of ◽  
The Relationship ◽  
Total P

The relationship of organic phosphorus content to a number of chemical properties was studied in the surface horizons of 38 soils of six different soil orders in British Columbia.The concentration of organic P ranged from 1.8 to 77.7% of the total P with amounts varying from 21 to 802 p.p.m. The forested soils of the Podzolic and Brunisolic Orders contained the least organic P. However, the wide range in organic P content within some soil orders indicated that its distribution was not entirely characteristic of the soil order.Simple correlation studies between organic P and nitrogen, carbon, pH, per cent base saturation, total P, and free iron in all soils before assigning them to groups indicated that only nitrogen and carbon were significantly related to organic P. Significant relationships between the other variables and organic P were restricted to specific soil orders. The organic P content has been found to be primarily dependent on nitrogen and pH, since the inclusion of the other independent variables in the multiple regression did not significantly change the coefficient of determination.The range of C/organic P and N/organic P ratios for the 38 samples was between 46 and 648 and 5.5 to 57.6 respectively. Soil pH was the only variable studied which could account for the wide variation of these ratios.

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