Response of lentil to VA Mycorrhizal inoculation and plant available P levels of unsterile soils

1985 ◽  
Vol 87 (3) ◽  
pp. 445-447 ◽  
Author(s):  
Suman Bala ◽  
O. S. Singh
Keyword(s):  
Available P ◽  
Mycorrhizal Inoculation ◽  
Plant Available P

scholarly journals Menage a trois - are two fungi too much for ryegrass?

2007 ◽  
Vol 13 ◽  
pp. 181-183
Author(s):  
Q. Liu ◽  
A.J. Parsons ◽  
H. Xue ◽  
H. Harzer ◽  
S. Rasmussen
Keyword(s):  
Lolium Perenne ◽  
Glomus Mosseae ◽  
Arbuscular Mycorrhizae ◽  
Growth Parameters ◽  
Arbuscular Mycorrhizal ◽  
Available P ◽  
Higher Plant ◽  
Neotyphodium Lolii ◽  
Mycorrhizal Inoculation ◽  
Plant Available P

A pot experiment investigated interactions between foliar endophytic (EP, Neotyphodium lolii) and root arbuscular mycorrhizal (AM, Glomus mosseae) fungi in Lolium perenne. The effects of three phosphorus (P) forms (KH2PO4-P, phosphate rock-P (PR) and phytate-P) on EP and AM colonisation and plant growth parameters were also assessed. AM arbuscular and vesicular structures were estimated by microscopic counting and fungal concentrations were quantified by qPCR of G. mosseae and N. lolii specific genes. Significantly more AM structures were formed in roots of EP-free compared to EP-infected plants, indicating that AM development is suppressed by the presence of foliar EPs. Total AM concentrations were also generally higher in EP-free plant roots, but not significantly. EP concentrations were significantly reduced by higher plant-available P in the growth medium, but mycorrhizal infection did not significant affect EP concentrations. Mycorrhizal inoculation increased shoot dry matter (DM) at low plant-available P in the PR treatment. Infection with the endophytic strain AR37 also significantly increased shoot DM and fungal concentrations were higher compared to CS (common or wild-type strain)- and AR1-infected plants. Insoluble phytate-P produced the same amount of biomass as soluble-P (K-Pi) did, suggesting that L. perenne has the ability to use organic P. Keywords: Neotyphodium lolii, Glomus mosseae, foliar endophyte, arbuscular mycorrhizae, Lolium perenne, qPCR, phosphate, AR1, AR37

scholarly journals Phosphorus availability in hydromorphic soils of Eastern Croatia

2011 ◽  
Vol 49 (No. 9) ◽  
pp. 394-401 ◽  
Author(s):  
D. Petosić ◽  
V. Kovacević ◽  
M. Josipović
Keyword(s):  
Surface Layer ◽  
High Frequency ◽  
Agricultural Land ◽  
Phosphorus Availability ◽  
Available P ◽  
Soil Profiles ◽  
P Availability ◽  
Hydromorphic Soils ◽  
Ammonium Lactate ◽  
Plant Available P

The phosphorus (P) availability was tested on hydromorphic soils located in theSavavalley. 480 soil profiles covering the area of31 227 hawas analysed in our study. The plant available P was determined by the Ammonium-Lactate method. The P availability in the surface layer (0–30 cm) is very low (up to 5 mg P2O5/100 g of soil) in about 30% of the tested agricultural land (9 440 ha), next 32% (9 897 ha) is in the range of a low P availability (from 5.1 to 10 mg), while only 17% (5 445 ha) has a good or very good P availability (above 20 mg). Especially high frequency of low P availability was found in vertic gley, amphygley and hypogley soils (total8 680 haor 28% of tested agricultural land).

Plant-available P for Maize and Cowpea in P-deficient Soils from the Nigerian Northern Guinea Savanna – Comparison of E- and L-values

2006 ◽  
Vol 283 (1-2) ◽  
pp. 251-264 ◽  
Author(s):  
Pieter Pypers ◽  
Liesbeth Van Loon ◽  
Jan Diels ◽  
Robert Abaidoo ◽  
Erik Smolders ◽  
...  
Keyword(s):  
Available P ◽  
Northern Guinea Savanna ◽  
Guinea Savanna ◽  
Plant Available P

scholarly journals What is the P value of Siberian soils? Soil phosphorus status in south-western Siberia and comparison with a global data set

2016 ◽  
Vol 13 (8) ◽  
pp. 2493-2509 ◽  
Author(s):  
Félix Brédoire ◽  
Mark R. Bakker ◽  
Laurent Augusto ◽  
Pavel A. Barsukov ◽  
Delphine Derrien ◽  
...  
Keyword(s):  
Agricultural Development ◽  
Western Siberia ◽  
Regional Scale ◽  
Global Scale ◽  
Available P ◽  
Northern Eurasia ◽  
Data Set ◽  
Slow Kinetics ◽  
Wide Range ◽  
Plant Available P

Abstract. Climate change is particularly strong in northern Eurasia and substantial ecological changes are expected in this extensive region. The reshaping and migration northwards of bioclimatic zones may offer opportunities for agricultural development in western and central Siberia. However, the bioclimatic vegetation models currently employed for projections still do not consider soil fertility, in spite of this being highly critical for plant growth. In the present study, we surveyed the phosphorus (P) status in the south-west of Siberia where soils have developed on loess parent material. We selected six sites differing in pedoclimatic conditions and the soil was sampled at different depths down to 1 m in aspen (Populus tremula L.) forest as well as in grassland areas. The P status was assessed by conventional methods and by isotope dilution kinetics. We found that P concentrations and stocks, as well as their distribution through the soil profile, were fairly homogeneous on the regional scale studied, although there were some differences between sites (particularly in organic P). The young age of the soils, together with slow kinetics of soil formation processes have probably not yet resulted in a sufficiently wide range of soil physico-chemical conditions to observe a more diverging P status. The comparison of our data set with similar vegetation contexts on the global scale revealed that the soils of south-western Siberia, and more generally of northern Eurasia, often have (very) high levels of total, organic and inorganic P. The amount of plant-available P in topsoils, estimated by the isotopically exchangeable phosphate ions, was not particularly high but was intermediate on the global scale. However, large stocks of plant-available P are stored in subsurface layers which currently have low fine-root exploration intensities. These results suggest that the P resource is unlikely to constrain vegetation growth and agricultural development under the present conditions or in the near future.

The use of isometric log ratios to classify phosphorus attributes in composts

2018 ◽  
Vol 98 (3) ◽  
pp. 448-457
Author(s):  
Bernard Gagnon ◽  
Serge-Étienne Parent ◽  
Dalel Abdi ◽  
Noura Ziadi ◽  
Léon-Étienne Parent
Keyword(s):  
Organic Matter Content ◽  
High Capacity ◽  
Organic Amendments ◽  
Matter Content ◽  
Available P ◽  
Processing Wastes ◽  
Log Ratio ◽  
Cluster 2 ◽  
Plant Available P ◽  
Total P

This research aimed to classify 16 horticultural composts collected across Canada into management group according to their phosphorus (P) fractions and carbon (C) content using isometric log ratio (ilr) and to interpret the clusters against the total P content and C-to-P ratio indices. The ilr approach was found to be more discriminant for grouping the composts compared with the conventional statistical analysis. The C-to-P ratio index was representative of cluster 1 only. This cluster included organic amendments with C-to-P ratios higher than 100 and high capacity to increase soil organic matter content without excessive P dosage. Total P separated clusters 2 and 3 despite the amalgamation of P forms into total P. Cluster 2 showed high total P (>10 g P kg−1) and low C-to-P ratios (24–38), whereas cluster 3 showed variable C-to-P ratios (18–78) and total P <9 g kg−1after excluding one compost close to cluster 2. Clusters 2 and 3 were considered as potential sources of plant-available P. The ilr approach suggests that composts made of municipal biosolids and poultry manures in cluster 2 have the highest potential as plant-available P source compared with those made of other livestock manures or food processing wastes.

Soil properties associated with formation of barren areas on formed dykelands cropped to forage

1993 ◽  
Vol 73 (4) ◽  
pp. 527-538 ◽  
Author(s):  
A. V. Rodd ◽  
K. B. McRae ◽  
J. B. Harnish ◽  
H. W. Kolstee
Keyword(s):  
Organic Matter ◽  
Bulk Density ◽  
Salt Content ◽  
Organic Matter Content ◽  
Sodium Content ◽  
Matter Content ◽  
Available P ◽  
Growing Conditions ◽  
Plant Available P ◽  
Resistance To Penetration

Acadia or dykeland soils have produced forages successfully for centuries. The formation of barren areas within very productive forage stands has been noted recently in some land-formed fields, indicating either poor germination or poor growing conditions. A survey was undertaken in 1988 to determine the differences in soil attributes between barren and productive areas, namely: topographical position, resistance to penetration, bulk density, pH, plant-available P2O5, -K2O, Ca, and Mg, salt content (as measured by conductivity and sodium adsorption ratio), and exchangeable and soluble Ca, Mg, K and Na. Barren areas had greater: plant-available P2O5, resistance to penetration (the differential ranged from 480 to 1440 kPa), bulk density (in the top 15 cm), salt and sodium content than the productive ones. The exchangeable and soluble Na:Mg and Na:Ca ratios were higher on barren areas than on productive areas. Organic matter content was lower on barren than on productive areas. Values for topographic position, pH, particle size classes and plant-available K2O, Ca, and Mg were similar between the productivity areas. The results of this survey indicate that the formation of barren areas appears to be mainly due to accumulation of excess salts, especially sodium. Reasons for salt accumulation in these areas are discussed. Key words: Acadia soils, dykeland, salt, sodium, organic matter, resistance to penetration

Depletion, accumulation and availability of soil phosphorus in the Askov long-term field experiment

Soil Research ◽  
2020 ◽  
Vol 58 (2) ◽  
pp. 117 ◽  
Author(s):  
Musibau O. Azeez ◽  
Gitte Holton Rubæk ◽  
Ingeborg Frøsig Pedersen ◽  
Bent T. Christensen
Keyword(s):  
Rock Phosphate ◽  
Soil Phosphorus ◽  
Available P ◽  
Soil P ◽  
Olsen P ◽  
Extractable P ◽  
P Application ◽  
Plant Available P ◽  
Water Extractable

Soil phosphorus (P) reserves, built up over decades of intensive agriculture, may account for most of the crop P uptake, provided adequate supply of other plant nutrients. Whether crops grown on soils with reduced supply of other nutrients obtain similar use-efficiency of soil P reserves remains unclear. In treatments of the Askov Long-Term Experiment (initiated in 1894 on light sandy loam), we quantified changes in soil total P and in plant-available P (Olsen P, water extractable P and P offtake in wheat grains) when P-depleted soil started receiving P in rock phosphate and when P application to soil with moderate P levels ceased during 1997–2017. Additionally we studied treatments with soil kept unfertilised for &gt;100 years and with soil first being P depleted and then exposed to surplus dressings of P, nitrogen (N) and potassium in cattle manure. For soil kept unfertilised for &gt;100 years, average grain P offtake was 6 kg ha–1 and Olsen P averaged 4.6 mg kg–1, representing the lower asymptotic level of plant-available P. Adding igneous rock phosphate to severely P-depleted soil with no N fertilisation had little effect on Olsen P, water extractable P (Pw), grain yields and P offtake. For soils with moderate levels of available P, withholding P application for 20 years reduced contents of Olsen P by 56% (from 16 to 7 mg P kg–1) and of Pw by 63% (from 4.5 to 1.7 mg P kg–1). However, the level of plant-available P was still above that of unfertilised soil. Application of animal manure to P-depleted soil gradually raised soil P availability, grain yield and P offtake, but it took 20 years to restore levels of plant-available P. Our study suggests symmetry between rates of depletion and accumulation of plant-available P in soil.

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