Comparative study of phosphorus and potassium levels of basaltic soils associated with scrub and forest communities on the Darling Downs

Soil Research ◽  
1983 ◽  
Vol 21 (4) ◽  
pp. 527 ◽  
Author(s):  
CR Ahern ◽  
SE MacNish
Keyword(s):  
Forest Soils ◽  
Soil Phosphorus ◽  
Strong Association ◽  
Soil Series ◽  
Soil Tests ◽  
Surface Samples ◽  
Forest Sites ◽  
Extractable Phosphorus ◽  
Phosphorus And Potassium ◽  
Soil Groups

Morphologically similar scrub and forest basalt soils were investigated for differences in soil phosphorus and potassium levels. Surface samples (0-10 cm) from 181 scrub and 111 forest sites were analysed for five soil tests: 0.05 M H2SO4-extractable phosphorus, 0.5 M NaHCO3- extractable phosphorus, 0.05 M HCl-extractable potassium, total phosphorus and total potassium by X-ray fluorescence. Highly significant differences (P <0.001) between scrub and forest soils were found for each soil test when all sites were assessed in terms of regional differences based on vegetation. These differences were then investigated further for each of the three common Great Soil Groups - black earths, euchrozems and lithosols - and then for six individual soil series common to both the scrub and forest areas. An unexplained geographic trend in phosphorus values previously reported (1972) in the same area could be accounted for by this difference between scrub and forest soils. Similar differences in soil phosphorus and potassium for scrub and forest soils on other parent materials are also discussed. It was clearly shown that the scrub means were always greater than the forest means for all five soil tests for all soils combined, each Great Soil Group and each soil series, and that there is a strong association between vegetation distribution and these soil differences.

Correlation of soil phosphorus tests with the response of irrigated perennial pasture to phosphorus fertilizer

1978 ◽  
Vol 18 (91) ◽  
pp. 243 ◽  
Author(s):  
AJ Montgomery ◽  
G Rubenis
Keyword(s):  
Soil Phosphorus ◽  
Maximum Yield ◽  
Correlation Coefficients ◽  
Response Functions ◽  
Phosphorus Fertilizer ◽  
Soil Tests ◽  
Yield Data ◽  
P Values ◽  
Olsen P ◽  
Pasture Yield

The level of soil phosphorus and the response of irrigated perennial pasture to phosphorus fertilizer were measured on 33 sites in the Goulburn Valley of northern Victoria. Eleven of the 33 sites were found to have Olsen P values above 10 p.p.m. and Colwell P values above 30 p.p.m. Of these 11, 9 did not give a pasture response to superphosphate and 2 gave a relatively small response. Functions of the form Y = a - be-CX (where Y = total pasture yield over 12 months (t ha-1), X = rate of superphosphate application (t ha-1), and a, b and c are constants respectively denoting maximum yield, maximum response, and the rate at which maximum yield is approached) were fitted to the yield data from those sites at which a response did occur. b was found to be correlated with a number of soil tests, the highest correlation coefficient being -0.74 for Colwell P. a was significantly correlated with some tests (P < 0.01) but was generally less predictable, and c gave very low correlation coefficients with all soil tests.

Effects of primary tillage and soil amendment practices on pearl millet yield and nutrient uptake in the Sahel of West Africa

1999 ◽  
Vol 35 (4) ◽  
pp. 437-448 ◽  
Author(s):  
F. N. IKPE ◽  
J. M. POWELL ◽  
N. O. ISIRIMAH ◽  
T. A. T. WAHUA ◽  
E. M. NGODIGHA
Keyword(s):  
Soil Amendment ◽  
Soil Phosphorus ◽  
Phosphorus Uptake ◽  
Nitrogen Levels ◽  
Tillage Practices ◽  
No Till ◽  
Primary Tillage ◽  
Repeated Applications ◽  
Phosphorus And Potassium ◽  
Millet Yield

The main objective of this study was to determine the best soil amendment and tillage practices for sustainable millet yield and grain and stover quality. The treatments included tillage practices (immediate-, late- and no-till) and soil amendments (sheep manure plus urine, manure, millet stover (stalks, leaf blades and leaf sheaths) and millet stover ash) in factorial combinations with fertilizer nitrogen levels of 0, 15 and 30 kg ha−1 plus controls. Results showed that (i) higher yields were obtained in tilled plots than in no-till plots; (ii) tillage timing may not be a significant yield determining factor; (iii) the application of animal urine resulted in significantly higher yield and greater nitrogen, phosphorus and potassium uptake than the application either of manure alone or of millet stover. Urine application (ruminant urine contains virtually no phosphorus), which elevates soil pH especially during the first week after application, may have resulted in the dissolution of phosphorus from the aluminium–iron complexes of kaolinitic clays. This is corroborated by the significantly higher phosphorus uptake from the manure-plus-urine plots than from plots amended with either manure alone or millet stover. Long-term implications of ‘mining’ soil phosphorus with repeated applications of animal urine in these fragile ecosystems remains unclear.

Age-related morphological and physiological responses of irrigated rice to declined soil phosphorus and potassium availability

2016 ◽  
Vol 15 (3) ◽  
pp. 499-511 ◽  
Author(s):  
K. A. T. N. Somaweera ◽  
D. N. Sirisena ◽  
W. A. J. M. De Costa ◽  
L. D. B. Suriyagoda
Keyword(s):  
Soil Phosphorus ◽  
Physiological Responses ◽  
Irrigated Rice ◽  
Age Related ◽  
Phosphorus And Potassium

scholarly journals Biological activity, nitrogen dynamics, and chemical characteristics of forest soils in the Šumava national park

2012 ◽  
Vol 49 (No. 7) ◽  
pp. 302-312 ◽  
Author(s):  
M. Svoboda
Keyword(s):  
Forest Soils ◽  
National Park ◽  
Large Scale ◽  
Ground Vegetation ◽  
Mountain Forest ◽  
Respiration Activity ◽  
Forest Sites ◽  
Tree Layer ◽  
Spruce Stands ◽  
Microclimatic Conditions

This paper deals with large-scale mountain forest decline in the &Scaron;umava National Park. The changes in biotic and abiotic properties of forest sites follow the tree layer disintegration. Changed microclimatic conditions such as intensity of irradiance, moisture and temperature of the top holorganic layers together with altered development of ground vegetation could strongly affect the values of microbiological respiration activity and the rates of nitrogen mineralization and nitrification. Soil substrates, built of organic mater, located on stony locations, are endangered by introskeletal erosion. This paper compares these features in pairs of research plots, consisting of dead or cut forest and of living stand. According to the results of this study, higher rates of organic matter decomposition, transformed dynamics of nitrogen and other nutrients and possible nutrient leaching from soil solutions were demonstrated in the forest floor under declined spruce stands. The extent and seriousness of these adverse processes for forest soils are strongly site dependent.

Soil phosphorus saturation degree: Review of some indices and their suitability for P management in Québec, Canada

1999 ◽  
Vol 79 (4) ◽  
pp. 615-625 ◽  
Author(s):  
Suzanne Beauchemin ◽  
R. R. Simard
Keyword(s):  
Environmental Fate ◽  
Saturation Index ◽  
Soil Phosphorus ◽  
Ammonium Oxalate ◽  
Calcareous Soils ◽  
Environmental Indicators ◽  
Saturation Degree ◽  
Soil P ◽  
Phosphorus Saturation ◽  
Soil Groups

Many agricultural fields contain excessive labile soil P in regard to crop needs. Its environmental fate must be assessed. The concept of P saturation degree is meaningful as it describes the portion of the soil binding sites already covered with P, and indicates the potential desorbability of soil P. The first objective of this study was to review different indices that have been proposed to estimate the degree of soil P saturation and the relationships between soil P saturation degree and P solubility. The second objective is to discuss their suitability as environmental indicators for P management in the province of Québec, Canada. In the Netherlands, the P saturation index is defined as the ratio of P to Al + Fe contents extracted by ammonium oxalate [Pox/( Alox + Feox ) or ( Pox/0.5( Alox + Feox )]. This approach has been mainly used with non-calcareous soils. In Québec, the ratio of Mehlich-III extractable P to Al (M3P/AlM3) is proposed as an alternative, which relies on routine laboratory test. However, the suitability of the M3P/AlM3 ratio has yet to be determined for some specific soil groups (e.g. gleyed soils, soils with Alox content >6 g kg−1) and for subsoil horizons. Regardless of the chosen index, it is suggested that the best way to manage the risk of water contamination by P in Québec (namely, defining critical levels of soil P saturation) may be to form homogeneous soil groups to account for their distinctive behaviour and characteristics. Key words: Phosphorus, saturation, management

scholarly journals Phosphorus requirements of some selected soil types in the Fiji sugarcane belt

2014 ◽  
Vol 32 (1) ◽  
pp. 1 ◽  
Author(s):  
M.S. Goundar ◽  
R.J. Morrison ◽  
C. Togamana
Keyword(s):  
Soil Phosphorus ◽  
Strong Association ◽  
Clay Content ◽  
Limiting Factors ◽  
Soil Types ◽  
Strong Positive Correlation ◽  
P Leaching ◽  
Phosphorus Requirements ◽  
Physical And Chemical

The availability of phosphorus (P) in soil is perceived to be one of the limiting factors to sustainable sugarcane production in Fiji. The main objective of this research was to ascertain the amount of bioavailable phosphorus in some Fiji sugarcane growing area soils; this will be valuable in improving the determination of the required amount of inorganic fertilizer to be applied to the soil. In this study, twelve different soils were selected from the sugarcane belt of Fiji and phosphorus buffer index (PBI) and phosphorus isotherm experiments were performed. Soil physical and chemical parameters were also measured and Pearson’s correlation tests used to identify patterns. It was found that Oxisols had the highest PBI values ranging from 134 to 170 while Inceptisols had the lowest ranging from 33 to 54. The PBI data followed a similar pattern to the generated isotherm curves of the different soil types. Most interest was in identifying soils with low PBIs as they have greater potential for P leaching through runoff into waterways. Clay content showed a strong positive correlation with PBI (R = 0.76, p ≤ 0.005). There is strong association with phosphorus fixation in soil with increasing levels of Al and Fe in the soil. Phosphorus availability and P fixation varied with soil types.

Sign in / Sign up

Export Citation Format

Share Document