Studies on some neutral red duplex soils (Dr 2.12) in north-eastern Queensland. 1. Morphological and chemical characteristics

1971 ◽  
Vol 11 (50) ◽  
pp. 328
Author(s):  
BJ Crack ◽  
RF Isbell
Keyword(s):  
Chemical Properties ◽  
Summer Rainfall ◽  
Nutrient Status ◽  
Neutral Red ◽  
Available Phosphorus ◽  
Red Clay ◽  
High Accumulation ◽  
North Eastern ◽  
Low Nitrogen

Morphological and chemical data are presented for neutral red duplex soils (Dr2.12) derived from granodiorite and diorite in north-eastern Queensland under a strongly seasonal summer rainfall. Mean annual totals range from about 24 inches (610 mm) to nearly 40 inches (1000 mm). The soils have slightly acid loamy A, horizons which overlie structured red clay B horizons of slightly acid to neutral reaction. C horizons containing much weathered rock occur at 50-70 cm and continue to depths exceeding two metres. Profiles show a consistent trend for many chemical properties ; a particular feature being the relatively high accumulation of phosphorus in the C horizon. Certain chemical analyses of surface soils are sufficiently consistent within and between sites to provide a broad regional characterization of plant nutrient status. The soils of the Charters Towers region have low nitrogen, organic carbon, and available phosphorus contents but potassium levels are moderate. Home Hill-Bowen soils are more variable but indicate generally higher fertility levels.

Studies on some solodic soils in north-eastern Queensland. 1. Morphological and chemical characteristics

1970 ◽  
Vol 10 (44) ◽  
pp. 334 ◽  
Author(s):  
BJ Crack ◽  
RF Isbell
Keyword(s):  
Chemical Properties ◽  
Summer Rainfall ◽  
Sampled Data ◽  
Nitrogen And Phosphorus ◽  
North Eastern ◽  
Variable Chemical ◽  
Calcium Magnesium ◽  
Major Chemical ◽  
Low Nitrogen ◽  
Phosphorus Levels

Morphological and chemical data are presented for solodic and solodized-solonetz soils occurring in north-eastern Queensland under a strongly seasonal summer rainfall. Mean annual totals range from 26 in, to 70 in. The soils have slightly acid sandy to loamy A horizons, often strongly bleached, and abruptly underlain by hard dense clay R horizons which are strongly alkaline at depth. Profiles show variable chemical properties but many surface elements show relatively little variability within or between areas sampled. Data for such elements may be interpolated for sites within the area studied. Major chemical features are low nitrogen and phosphorus levels which show little variation between areas sampled. The exchangeable calcium : magnesium ratio of surface soils is narrow but values do not suggest deficiencies or imbalance. In the subsoils magnesium and sodium are the dominant exchangeable cations. Exchangeable and acid-extractable potassium values are variable in surface horizons, and data indicate sufficiency in the lower rainfall areas with likelihood of deficiency under higher rainfall. The soils have several adverse physical properties.

Studies on some neutral red duplex soils (Dr 2.12) in north-eastern Queensland. 2. Glasshouse assessment of plant nutrient status

1971 ◽  
Vol 11 (50) ◽  
pp. 336 ◽  
Author(s):  
BJ Crack
Keyword(s):  
Zinc Deficiency ◽  
Nutrient Status ◽  
Neutral Red ◽  
Plant Nutrient ◽  
Factorial Experiments ◽  
Nutrient Interactions ◽  
Sulphur Deficiency ◽  
Stylosanthes Humilis ◽  
North Eastern ◽  
Test Plants

Glasshouse experiments using the subtractive technique were conducted on 15 neutral red duplex soils from north-eastern Queensland. On two of the soils factorial experiments were conducted to obtain information on nutrient interactions. The legumes Phaseolus lathyroides and Stylosanthes humilis were used as test plants. All soils were deficient in phosphorus, sulphur, and molybdenum, although the magnitude of the various deficiencies often differed between soils. Yields of plants were well correlated with phosphorus extracted from the soils by 0.01 N.H,SO, and by 0.5 M. Na HCO3. Soil tests used were unsatisfactory indices of sulphur deficiency. A possible zinc deficiency was indicated.

scholarly journals Fertility Status of Groundnut Growing Calcareous Vertisols of Dharwad District, Karnataka

2020 ◽  
pp. 7-19
Author(s):  
V. Manasa ◽  
N. S. Hebsur ◽  
P. L. Patil ◽  
M. Hebbara ◽  
B. N. Aravind Kumar ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Ph ◽  
Calcareous Soils ◽  
Chemical Properties ◽  
Nutrient Status ◽  
Soil Survey ◽  
Available Phosphorus ◽  
Available Nitrogen ◽  
Caco3 Content ◽  
Nutrient Index

A soil survey was carried out in different groundnut growing calcareous Vertisols of Dharwad district, Karnataka, India. One hundred surface composite soil samples were collected from five talukas (mandal) of Dharwad district and analyzed for soil chemical properties and nutrient status. The results showed that soil pH, electrical conductivity, organic carbon, free CaCO3 content ranged from 6.9-8.9, 0.15-1.79 dS m-1, 2.40-9.10 g kg-1, 5.8 -22.2 respectively across the regions. Available nitrogen, phosphorus (P2O5), potassium (K2O) and sulphur contents widely varied from 107-268, 18.5 - 56.0 and 386- 876, 14.8- 41.0 kg ha-1, respectively. On the basis of nutrient index values, groundnut growing calcareous soils of Dharwad were categorized as deficient in available nitrogen, medium in available phosphorus and high in available potassium. Most of the samples were deficient in available Fe and Zn whereas DTPA-extractable Cu and Mn were above the critical limits. A significant and positive correlation was found between organic carbon and available nitrogen (r=0.730**). However, a negative correlation was observed between Soil pH and micro nutrients while CaCO3 was negatively correlated with available iron (r=-0.31**).

Studies on some neutral red duplex soils (Dr 2.12) in north-eastern Queensland. 3. Availability of phosphorus in the C-horizon

1975 ◽  
Vol 15 (76) ◽  
pp. 689
Author(s):  
ME Probert
Keyword(s):  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Neutral Red ◽  
Available Phosphorus ◽  
Panicum Maximum ◽  
Stylosanthes Humilis ◽  
North Eastern ◽  
Coarse Grains ◽  
Phosphorus Status ◽  
Townsville Stylo

The C horizon phosphorus in neutral red duplex soils derived from granodiorite is shown by electron microprobe analysis to be present as coarse grains of apatite. Glasshouse experiments failed to show any contribution from this phosphorus to the nutrition of the test crops (Townsville stylo Stylosanthes humilis and green panic Panicum maximum). Since this phosphorus is soluble in 0.01 N H2SO4, this extractant grossly overestimated the available phosphorus status whereas extraction with 0.5 M NaHCO3 indicated the non-availability of the C horizon phosphorus in these soils.

scholarly journals Transcriptional activities of methanogens and methanotrophs vary with methane emission flux in rice soils under chronic nutrient constraints of phosphorus and potassium

2016 ◽  
Vol 13 (23) ◽  
pp. 6507-6518 ◽  
Author(s):  
Rong Sheng ◽  
Anlei Chen ◽  
Miaomiao Zhang ◽  
Andrew S. Whiteley ◽  
Deepak Kumaresan ◽  
...  
Keyword(s):  
Plant Growth ◽  
Nutrient Deficiency ◽  
Chemical Properties ◽  
Experimental System ◽  
Nutrient Status ◽  
Transcript Abundance ◽  
Available Phosphorus ◽  
Community Structures ◽  
Rice Soils ◽  
P Deficiency

Abstract. Nutrient status in soil is crucial for the growth and development of plants which indirectly or directly affect the ecophysiological functions of resident soil microorganisms. Soil methanogens and methanotrophs can be affected by soil nutrient availabilities and plant growth, which in turn modulate methane (CH4) emissions. Here, we assessed whether deficits in soil-available phosphorus (P) and potassium (K) modulated the activities of methanogens and methanotrophs in a long-term (20 year) experimental system involving limitation in either one or both nutrients. Results showed that a large amount of CH4 was emitted from paddy soil at rice tillering stage (flooding) while CH4 flux was minimum at ripening stage (drying). Compared to soils amended with NPK fertiliser treatment, the soils without P input significantly reduced methane flux rates, whereas those without K input did not. Under P limitation, methanotroph transcript copy number significantly increased in tandem with a decrease in methanogen transcript abundance, suggesting that P-deficiency-induced changes in soil physio-chemical properties, in tandem with rice plant growth, might constrain the activity of methanogens, whereas the methanotrophs might be adaptive to this soil environment. In contrast, lower transcript abundance of both methanogen and methanotrophs were observed in K-deficient soils. Assessments of community structures based upon transcripts indicated that soils deficient in P induced greater shifts in the active methanotrophic community than K-deficient soils, while similar community structures of active methanogens were observed in both treatments. These results suggested that the population dynamics of methanogens and methanotrophs could vary along with the changes in plant growth states and soil properties induced by nutrient deficiency.

scholarly journals Characterization of Humic Acid and Fulvic Acid Extracted from Soil Samples of Cultivated Areas of North Bengal and Sikkim States, India

2020 ◽  
Vol 33 (1) ◽  
pp. 62-66
Author(s):  
M. Chanda ◽  
S. Jha ◽  
D. Mukhopadhyay ◽  
M. Pandey
Keyword(s):  
Humic Acid ◽  
Organic Carbon ◽  
Fulvic Acid ◽  
Chemical Properties ◽  
Available Phosphorus ◽  
Physico Chemical ◽  
Chemical Studies ◽  
Measurement Surface ◽  
North Bengal

Humic acid and fulvic acid extracted from soils of cultivated areas, collected from Majitar, Darjeeling and Pundibari cities were first isolated, purified and then characterized for the physico-chemical properties (oxidizable organic carbon, electrical conductivity, pH, phosphorus, nitrogen, potassium, CEC, etc.). The physico-chemical studies showed that soils were neutral to acidic but are independent of altitude. Organic carbon, available phosphorus, nitrogen were higher with soil of Majitar city. The total acidity, carboxylic group, phenolic -OH group were higher in fulvic acid than in humic acid. Further, both acids were characterized by potentiometric titration, viscometric measurement, surface tension and spectral analysis. The humification index (E4/E6) of fulvic acid was relatively higher than humic acid. The highest molecular weight of humic acid and fulvic acid were recorded 13645.83 and 1465.54, respectively.

scholarly journals Effect of Mosses on physical and chemical properties of soil in temperate forests of Garhwal Himalayas

2021 ◽  
pp. 1-10
Author(s):  
Anshu Siwach ◽  
Siddhartha Kaushal ◽  
Ratul Baishya
Keyword(s):  
Physical Properties ◽  
Chemical Properties ◽  
Nutrient Status ◽  
High Rate ◽  
Physical And Chemical Properties ◽  
Garhwal Himalayas ◽  
Forest Sites ◽  
Significant Difference ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract Mosses are one of the most important and dominant plant communities, especially in the temperate biome, and play a significant role in ecosystem function and dynamics. They influence the water, energy and element cycle due to their unique ecology and physiology. The present study was undertaken in three different temperate forest sites in the Garhwal Himalayas, viz., Triyuginarayan (Kedarnath Wildlife Sanctuary (KWLS)), Chakrata, and Kanasar forest range. The study was focused on understanding the influence of mosses on soil physical properties and nutrient availability. Different physico-chemical properties were analysed under two different substrata, that is, with and without moss cover in two different seasons, viz., monsoon and winter. We observed mosses to influence and alter the physical properties and nutrient status of soil in both seasons. All soil physical and chemical properties, except magnesium, showed significant difference within the substrates, among all the sites and across the two seasons. Besides the soil characteristics underneath the moss vegetation, the study also highlights the diversity of mosses found in the area. Mosses appear to create high nutrient microsites via a high rate of organic matter accumulation and retain nutrients for longer periods thus, maintaining ecosystem stability.

Instantaneous Mass/Charge Ratio F(dm/dQ) of the Voltammetric Generation and Characterization of Poly-(Neutral Red) Conducting Films

2019 ◽  
Vol 2 (16) ◽  
pp. 11-18
Author(s):  
Francisco Vicente ◽  
Jeronimo Agrisuelas ◽  
Claude Gabrielli ◽  
Joan Gregori ◽  
Jose Juan Garcia-Jareño ◽  
...  
Keyword(s):  
Neutral Red ◽  
Charge Ratio
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