A comparison of four soil test procedures for determination of available phosphorus in calcareous soils of the mediterranean region

1988 ◽  
Vol 19 (2) ◽  
pp. 127-140 ◽  
Author(s):  
A.E. Matar ◽  
S. Garabed ◽  
S. Riahi ◽  
A. Mazid
Keyword(s):  
Mediterranean Region ◽  
Calcareous Soils ◽  
Available Phosphorus ◽  
Soil Test ◽  
Test Procedures ◽  
The Mediterranean

scholarly journals 657 PB 063 IRON DEFICIENCY IN POTATO IN THE MEDITERRANEAN REGION AND ITS CONTROL THROUGH RESISTANT GENOTYPES AND NUTRIENT APPLICATION

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 527a-527
Author(s):  
H.Z. Zaiter
Keyword(s):  
Iron Deficiency ◽  
Mediterranean Region ◽  
Tuber Yield ◽  
Solanum Tuberosum L ◽  
Calcareous Soils ◽  
Silty Clay ◽  
Iron Deficiency Chlorosis ◽  
High Ph ◽  
The Mediterranean ◽  
Silty Clay Soil

Iron-deficiency symptoms are observed on some genotypes of potato (Solanum tuberosum L.) grown on high-pH and calcareous soils. seven potato cultivars differing in response to iron deficiency chlorosis (FeDC) were grown on high-pH (8.1), calcareous (38% calcium carbonate equivalent in surface 20 cm) and silty clay soil in the field (Beka'a Valley, Lebanon), to determine the effects of FeDC on tuber yield of cultivars sprayed with Fe. A significant interactions between cultivars and Fe spray treatment were noted for visual FeDC ratings and tuber yield. Even though only slight FeDC was noted on some cultivars receiving no Fe spray, tuber yields were significantly increased when sprayed with Fe. Some cultivars with moderate FeDC ratings did not show a significant increase in yield when sprayed with Fe while other cultivars did. Sprayed cultivars generally produced higher tube; yields than unsprayed ones. Indicating that Fe-deficiency chlorosis in the Mediterranean region may be a serious limitation to potato tuber yield.

scholarly journals EXTRACTION OF POTASSIUM AND SODIUM FROM ACID AND CALCAREOUS SOILS WITH THE KELOWNA MULTIPLE ELEMENT EXTRACTANT

1989 ◽  
Vol 69 (2) ◽  
pp. 235-242 ◽  
Author(s):  
W. VAN LIEROP ◽  
N. A. GOUGH
Keyword(s):  
Calcareous Soils ◽  
Water Extract ◽  
Complexing Agents ◽  
Soil Test ◽  
Test Interpretation ◽  
Ph Values ◽  
Correlation Techniques ◽  
Regression Slopes ◽  
Soil Groups

The objective of this study was to evaluate the Kelowna multiple element extractant and some EDTA and DTPA modifications for simultaneous determination of potassium and sodium in acid and calcareous soils. To that end, the relationships between K and Na concentrations extracted with 1 N NH4OAc and the Kelowna multiple element extractant (0.25 N HOAc + 0.015 N NH4F) were assessed. However, relationships between K and Na concentrations removed by the modified Kelowna multiple element extractants containing either EDTA or DTPA (KEDTA & KDTPA with NH4F; and AAEDTA & AADTPA without NH4F) were evaluated by comparing values against those obtained with the Kelowna extractant. Addition of these complexing agents was of interest because of their potential in enabling simultaneous extraction of available Zn. The procedures were evaluated by contrasting K and Na concentrations extracted from 100 Canadian soils — half which had pH values between 4.1 and 6.9 (H2O) and a second group with values between 7 and 9.6 — by means of graphing, regression and correlation techniques. Potassium and sodium concentrations removed by the Kelowna extractant ranged from 25 to 510 μg and from 10 to 1420 μg mL−1 soil, respectively. The Kelowna and its EDTA and DTPA modifications extracted K and Na as effectively from acid as calcareous soils. This conclusion was supported by the similar regression slopes obtained when relating concentrations of K and Na removed from these soil groups by the multiple element extractants against those removed by 1 N NH4OAc (r-values ≥ 0.97**). However, the new multiple element extractants removed an average of about 20% less K than 1 N NH4OAc from these soils, though similar Na levels. The lower K levels removed from the Kelowna extractant, or by one of its modifications, may require that soil test interpretation norms be adjusted to compensate for the lower values when using one of these to determine K-availability. A significant correlation was found between extracted Na levels and 1:2 vol/vol water-extract conductivities (r ≥ 0.83**) suggesting that "higher" Na levels may be soluble instead of exchangeable. Some Na test interpretations are discussed in the text. Key words: EDTA, DTPA

scholarly journals Review of the species of the sylvicola group within Corticaria Marsham, 1802 (Coleoptera: Latridiidae) of Mediterranean region

2019 ◽  
Vol 28 (2) ◽  
pp. 75-102
Author(s):  
José Otero ◽  
Wolfgang Rücker
Keyword(s):  
Natural History ◽  
Mediterranean Region ◽  
Identification Key ◽  
National Museum ◽  
The Mediterranean

Asystematic review of the Mediterranean region species of the sylvicola group of Corticaria Marsham, 1802 is carried out. An identification key for the determination of those 21 species is provided. Morphological structures of the studied species are re-appraised and figures are provided of head, antennae, pronotum, and aedeagus with internal armature. The true identity of Corticaria tunisiensis Brisout de Barneville, 1884 is established by examination of the specimens of the collection of National Museum of Natural History, Paris, here designating a male lectotype and paralectotypes of both sexes.

Predicting the response of wheat (Triticum aestivum L.) to liquid and granular phosphorus fertilisers in Australian soils

Soil Research ◽  
2007 ◽  
Vol 45 (6) ◽  
pp. 448 ◽  
Author(s):  
T. M. McBeath ◽  
M. J. McLaughlin ◽  
R. D. Armstrong ◽  
M. Bell ◽  
M. D. A. Bolland ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Calcium Carbonate ◽  
Dry Matter ◽  
Calcareous Soils ◽  
Triticum Aestivum L ◽  
Soil Test ◽  
Alkaline Soils ◽  
Test Procedures ◽  
Soil P ◽  
Yield Responses

Liquid forms of phosphorus (P) have been shown to be more effective than granular P for promoting cereal growth in alkaline soils with high levels of free calcium carbonate on Eyre Peninsula, South Australia. However, the advantage of liquid over granular P forms of fertiliser has not been fully investigated across the wide range of soils used for grain production in Australia. A glasshouse pot experiment tested if liquid P fertilisers were more effective for growing spring wheat (Triticum aestivum L.) than granular P (monoammonium phosphate) in 28 soils from all over Australia with soil pH (H2O) ranging from 5.2 to 8.9. Application of liquid P resulted in greater shoot biomass, as measured after 4 weeks’ growth (mid to late tillering, Feeks growth stage 2–3), than granular P in 3 of the acidic to neutral soils and in 3 alkaline soils. Shoot dry matter responses of spring wheat to applied liquid or granular P were related to soil properties to determine if any of the properties predicted superior yield responses to liquid P. The calcium carbonate content of soil was the only soil property that significantly contributed to predicting when liquid P was more effective than granular P. Five soil P test procedures (Bray, Colwell, resin, isotopically exchangeable P, and diffusive gradients in thin films (DGT)) were assessed to determine their ability to measure soil test P on subsamples of soil collected before the experiment started. These soil test values were then related to the dry matter shoot yields to assess their ability to predict wheat yield responses to P applied as liquid or granular P. All 5 soil test procedures provided a reasonable prediction of dry matter responses to applied P as either liquid or granular P, with the resin P test having a slightly greater predictive capacity on the range of soils tested. The findings of this investigation suggest that liquid P fertilisers do have some potential applications in non-calcareous soils and confirm current recommendations for use of liquid P fertiliser to grow cereal crops in highly calcareous soils. Soil P testing procedures require local calibration for response to the P source that is going to be used to amend P deficiency.

scholarly journals Tectonic interpretation of large scale geodetic measurements (VLBI, SLR) in the Central Mediterranean region: constraints and uncertainties

1995 ◽  
Vol 38 (1) ◽  
Author(s):  
E. Mantovani ◽  
D. Albarello ◽  
C. Tarnburelli ◽  
M. Viti
Keyword(s):  
Mediterranean Region ◽  
Large Scale ◽  
Tectonic Setting ◽  
Geodetic Data ◽  
Central Mediterranean ◽  
Geodetic Measurements ◽  
The Mediterranean ◽  
Tectonic Interpretation ◽  
Relative Motions

Some considerations are reported on the tectonic setting and microplate mosaic in the Mediterranean zones where VLBI and SLR stations are located. In particular, the possible sources of ambiguity in the determination of the Africa-Eurasia and Adriatic-Eurasia relative motions from geodetic data are discussed. Possible alternative kinematic interpretations, with respect to those reported in the literature, are then proposed.

Sign in / Sign up

Export Citation Format

Share Document