Plant nutrient status of soils of the Atherton Tableland, North Queensland

1972 ◽  
Vol 12 (59) ◽  
pp. 618 ◽  
Author(s):  
PC Kerridge ◽  
CS Andrew ◽  
GG Murtha
Keyword(s):  
Trifolium Repens ◽  
Nutrient Status ◽  
Parent Material ◽  
Metamorphic Rocks ◽  
Plant Nutrient ◽  
Total Rainfall ◽  
Acid Volcanic ◽  
Order Of Magnitude ◽  
Potassium Response ◽  
Test Plants

The principal soils of the Atherton Tableland are derived from basalt, granite, acid volcanic, and metamorphic rocks. They are predominantly krasnozems with some xanthozems and krasnozem variants. They were assessed for plant nutrient status by means of glasshouse experiments using the legumes Desmodium intortum and Trifolium repens as test plants. The main nutrient responses were, in decreasing order of magnitude, to phosphorus, molybdenum, and potassium. There were also small responses on some soils to sulphur, liming, and, under liming, to zinc. For most of the soils growth was negligible in the absence of added phosphorus. Responses to added molybdenum in the presence of liming indicated gross soil molybdenum deficiency. Potassium response was related to total rainfall except for the soils on metamorphic parent material.

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 Seasonal variation in AMF colonisation, soil and plant nutrient content in gypsum specialist and generalist species growing in P-poor soils

2021 ◽  
Author(s):  
Andreu Cera ◽  
Estephania Duplat ◽  
Gabriel Montserrat-Martí ◽  
Antonio Gómez-Bolea ◽  
Susana Rodríguez-Echeverría ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Nutrient Availability ◽  
Soil Nutrient ◽  
Nutrient Status ◽  
Nutrient Content ◽  
P Availability ◽  
Plant Nutrient ◽  
Rhizospheric Soil ◽  
Soil Nutrient Availability ◽  
Generalist Species

Abstract Aims Gypsum soils are P-limited atypical soils that harbour a rich endemic flora. These singular soils are usually found in drylands, where plant activity and soil nutrient availability are seasonal. No previous studies have analysed the seasonality of P nutrition and its interaction with the arbuscular mycorrhiza fungi (AMF) colonisation in gypsum plants. Our aim was to evaluate the seasonal changes in plant nutrient status, AMF colonisation and rhizospheric soil nutrient availability in gypsum specialist and generalist species. Methods We evaluated seasonal variation in the proportion of root length colonised by AMF structures (hyphae, vesicules and arbuscules), plant nutrient status (leaf C, N and P and fine root C and N) and rhizospheric soil content (P, organic matter, nitrate and ammonium) of three gypsum specialists and two generalists throughout a year. Results All species showed arbuscules within roots, including species of Caryophyllaceae and Brassicaceae. Root colonisation by arbuscules (AC) was higher in spring than in other seasons, when plants showed high leaf P-requirements. Higher AC was decoupled from inorganic N and P availability in rhizospheric soil, and foliar nutrient content. Generalists showed higher AC than specialists, but only in spring. Conclusions Seasonality was found in AMF colonisation, rhizospheric soil content and plant nutrient status. The mutualism between plants and AMF was highest in spring, when P-requirements are higher for plants, especially in generalists. However, AMF decoupled from plant demands in autumn, when nutrient availability increases in rhizospheric soil.

scholarly journals Fertilizing of young rubber in the Cameroons.

1960 ◽  
Vol 8 (3) ◽  
pp. 165-178
Author(s):  
H.N. Hasselo
Keyword(s):  
Phosphate Rock ◽  
Growth Response ◽  
Nutrient Status ◽  
Nutrient Supply ◽  
Parent Material ◽  
Rooting Depth ◽  
First Year ◽  
Second Year ◽  
One Year ◽  
Shallow Soils

The growth response to (NH4)2SO4, phosphate rock and KC1, given in all combinations at increasing annual rates of up to 24 oz/tree until the seventh year after planting, was measured by the girth increase of Hevea in three soils formed from the same parent material but possessing different nutrient status and depths to the root-impeding layers. Despite poor nutrient supply in the soil, lack of rooting depth had a greater effect on growth than had nutrient availability; while abundant nutrient supply reduced the unproductive period by half a year, this reduction was at least one year in shallow soils. Annual fluctuations in yield were reduced by balanced application of small amounts of fertilizers. Fertilized trees, opened up at 18-inch girth, yielded 430 lb/acre in the first year whether given balanced fertilizer or not; in the second year, trees given balanced fertilizer yielded 700 lb as compared with 580 lb without fertilizer. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Soil structure, nutrient status and water holding capacity shape Uruguayan grassland prokaryotic communities

2020 ◽  
Vol 96 (12) ◽  
Author(s):  
Silvia Garaycochea ◽  
Héctor Romero ◽  
Elena Beyhaut ◽  
Andrew L Neal ◽  
Nora Altier
Keyword(s):  
Soil Microbial Communities ◽  
Nutrient Status ◽  
Parent Material ◽  
Water Holding Capacity ◽  
Soil Types ◽  
Available Phosphorus ◽  
Rrna Gene ◽  
Principal Coordinates ◽  
Natural Grasslands ◽  
Water Holding

ABSTRACT Soil microbial communities play critical roles in maintaining natural ecosystems such as the Campos biome grasslands of southern South America. These grasslands are characterized by a high diversity of soils, low available phosphorus (P) and limited water holding capacity. This work aimed to describe prokaryotic communities associated with different soil types and to examine the relationship among these soil communities, the parent material and the soil nutrient status. Five Uruguayan soils with different parent material and nutrient status, under natural grasslands, were compared. The structure and diversity of prokaryotic communities were characterized by sequencing 16S rRNA gene amplicons. Proteobacteria, Actinobacteria, Firmicutes,Verrucomicrobia, Acidobacteria, Planctomycetes and Chloroflexi were the predominant phyla. Ordination based on several distance measures was able to discriminate clearly between communities associated with different soil types. Edge-PCA phylogeny-sensitive ordination and differential relative abundance analyses identified Archaea and the bacterial phyla Firmicutes, Acidobacteria, Actinobacteria and Verrucomicrobia as those with significant differences among soil types. Canonical analysis of principal coordinates identified porosity, clay content, available P, soil organic carbon and water holding capacity as the main variables contributing to determine the characteristic prokaryotic communities of each soil type.

Effect of environment and plant phenology on prediction of plant nutrient deficiency using leaf analysis in Leucaena leucocephala

2011 ◽  
Vol 62 (3) ◽  
pp. 248 ◽  
Author(s):  
Alejandro Radrizzani ◽  
Scott A. Dalzell ◽  
H. Max Shelton
Keyword(s):  
Ambient Temperature ◽  
Leucaena Leucocephala ◽  
Nutrient Status ◽  
Plant Phenology ◽  
Chronological Age ◽  
Nutrient Concentrations ◽  
Strongly Correlated ◽  
Plant Nutrient ◽  
Leaf Analysis ◽  
Stage Of Development

Plant analysis is an important tool for predicting plant nutrient imbalances associated with variable soil fertility and it is usually based on analysis of index plant parts such as the youngest fully expanded leaf (YFEL). Recent use of the YFEL to diagnose plant nutrient status of Leucaena leucocephala subsp. glabrata (leucaena) pastures has given unreliable results. Two field trials, one irrigated and one dryland, were conducted in subtropical Queensland to investigate the effect of index leaf selection, plant phenology and environmental factors (ambient temperature and water stress) on leaf nutrient concentrations. The YFEL was identified as the best plant part to sample because it was readily identifiable and had consistent concentrations of most nutrients compared to older and younger leaves provided specific conditions were met when sampling. At both sites there was significant (P < 0.05) seasonal variation in nutrient concentrations in leucaena YFEL, which was poorly correlated with ambient temperature but strongly correlated with rainfall in the preceding 28 days and chronological age of YFEL. Advancing plant phenological stage of development increased the chronological age of YFEL from 12 to 73 days under irrigation since no new leaves were produced for prolonged periods during pod filling and maturation. Similarly, YFEL could be 146 days old on plants in vegetative stages of growth under prolonged drought in dryland conditions. YFEL of ~21 days of age or less were found to be optimal for analysis. Furthermore, as the calcium (Ca) concentration of YFEL was strongly correlated with leaf chronological age, this parameter could be used to determine the age of the leaves sampled. YFEL with Ca concentrations >0.75% DM were likely to be >21 days in age and should not be used for the diagnosis of plant nutrient status. It was concluded that leaf analysis could be used to confidently assess leucaena plant nutrient status provided the YFEL were sampled from actively growing plants in vegetative development that had received rainfall/irrigation in the preceding 28 days and were <21 days of age.

Soil parent material—A major driver of plant nutrient limitations in terrestrial ecosystems

2017 ◽  
Vol 23 (9) ◽  
pp. 3808-3824 ◽  
Author(s):  
Laurent Augusto ◽  
David L. Achat ◽  
Mathieu Jonard ◽  
David Vidal ◽  
Bruno Ringeval
Keyword(s):  
Terrestrial Ecosystems ◽  
Parent Material ◽  
Plant Nutrient ◽  
Nutrient Limitations ◽  
Soil Parent Material

The Influence of Specimen Geometry and Test Times on High Temperature Crack Growth Behaviour in Parent and Welded 316H Stainless Steel

2008 ◽  
Author(s):  
Catrin M. Davies ◽  
Robert C. Wimpory ◽  
Masaakai Tabuchi ◽  
David W. Dean ◽  
Kamran M. Nikbin
Keyword(s):  
Crack Growth ◽  
Large Fraction ◽  
Creep Crack Growth ◽  
Compact Tension ◽  
Parent Material ◽  
Test Duration ◽  
Crack Growth Behaviour ◽  
Creep Crack ◽  
Order Of Magnitude ◽  
Fracture Specimens

Experimental crack growth testing has been performed at 550 °C on a range of fracture specimens including sections taken from a 316 steel weldment. These specimens include the compact tension, C(T), and circumferentially cracked notched bar, CCB, geometries of various sizes. Results are presented from two creep crack growth (CCG) tests on a large and a small CCB weldment specimen. The creep crack initiation (CCI) and growth (CCG) behavior of the CCB weldments has been compared to that of homogeneous parent material (PM) CCB and C(T) specimens and to C(T) weldment specimen data. The data has been analyzed in terms of the C* parameter. The initiation period is found to occupy a large fraction of the test duration for weldments. The CCG rates in the larger CCB weldment test is on the order of six times faster, for a given value of C*, compared to the smaller specimen, indicating a specimen size effect. The CCI times are around an order of magnitude greater for the CCB weldment specimens compared to C(T) weldment data and are higher than that of the PM CCB data. It is recommended that further testing on weldment specimens is performed to affirm the apparent trends.

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