Responses of carbon, nitrogen and phosphorus stoichiometry in different root orders of Zanthoxylum armatum seedlings to four soil types

2021 ◽  
Author(s):  
XiMin Zhi ◽  
Shun Gao ◽  
XiMin Zhi ◽  
Menglin Jiang ◽  
Yajuan Wang ◽  
...  
Keyword(s):  
Soil Types ◽  
Nitrogen And Phosphorus ◽  
Zanthoxylum Armatum

scholarly journals Statistical comparison of soil analysing results of chernozem soils

2008 ◽  
pp. 93-99
Author(s):  
Róbert Víg ◽  
Attila Dobos ◽  
Zoltán Pongrácz
Keyword(s):  
Zinc Content ◽  
Soil Samples ◽  
Soil Types ◽  
Chernozem Soil ◽  
Nitrogen And Phosphorus ◽  
Soil Plasticity ◽  
The Difference ◽  
Phosphorus And Potassium ◽  
Precision Fertilization ◽  
Nitrogen Phosphorus

The soil fertility was degraded as a result of unreasonable tillage, therefore the application of site-specific nutrient replacement is necessary. It is essential for the application of precision fertilization to know the location, extension, soil properties and nutrient-supply of the different soil types ofcultivated areas.We collected soil samples from 580 hectares of land in 2006. Soil samples were collected from every 5 ha in 30 and 60 cm depths during Spring from 20.05.2006 to 12.06.2006 and again in Autumn from 09.19.2006 to 02.10.2006. Soil samples were analysed at the Department of Agricultural Chemistry and Soil Science of DE-ATC.The two examined soils are slightly calcareous, weakly saline, poor in zinc. The calcareous chernozem soil is slightly acid, the content of humus, nitrogen, phosphorus and potassium is medium in this soil. The meadow chernozem soil is slightly alkaline, and properly supplied with humus and potassium, and middling supplied with nitrogen and phosphorus. The meadow chernozem soil is more heterogenous in soil plasticity, lime, saline, nitrogen phosphorus and potassium content and less heterogenous in pH and zinc content than the calcareous chernozem soil.Standard deviation of measured values in pH, soil plasticity, humus and nitrogen content significantly differ between the examined soil types. The soil plasticity, pH, humus, nitrogen and zinc content significantly differ among calcareous chernozem soil and meadow chernozem soil, but the difference in phosphorus content can be statistically proven only in case of Spring soil sampling.

scholarly journals Changes in Nutrient Concentrations of Two Streams in Western Lithuania with Focus on Shrinkage of Agriculture and Effect of Climate, Drainage Runoff and Soil Factors

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1590
Author(s):  
Bučienė ◽  
Povilaitis ◽  
Langas ◽  
Bučas ◽  
Petkuvienė ◽  
...  
Keyword(s):  
Agricultural Land ◽  
Cold Season ◽  
Soil Types ◽  
Nutrient Concentrations ◽  
Agricultural Activities ◽  
Land Area ◽  
Soil Factors ◽  
Nitrogen And Phosphorus ◽  
Relationship Of ◽  
Research Period

The causal relationship of changes in nitrogen and phosphorus concentrations in the Akmena-Danė River and its largest tributary, the Eketė River, was analysed for the period 1999–2014. Results showed that the annual concentrations of NH4-N and PO4-P significantly decreased in the Eketė River over the research period. NH4-N also significantly decreased in the Akmena-Danė River. This was mostly due to the shrinkage of agriculture, i.e., the reduction in agricultural land area, total farm and animal numbers and other agricultural activities. The effect of other factors such as air temperature, precipitation rate, shift of precipitation maximum from warm to cold season, drainage runoff from the large tile-drained areas, soil types and the slight increase in forested land was also examined.

CHANGES IN THE AMOUNT OF NITROGEN AND PHOSPHORUS IN THE SOIL BETWEEN FALL AND SPRING SAMPLING

1979 ◽  
Vol 59 (3) ◽  
pp. 271-276 ◽  
Author(s):  
D. W. L. READ ◽  
D. R. CAMERON
Keyword(s):  
Nutrient Content ◽  
Climatic Conditions ◽  
Mineral Nitrogen ◽  
Soil Types ◽  
Nitrogen And Phosphorus ◽  
Extractable P ◽  
P Content ◽  
Seeding Time

Soils were sampled to 120-cm depths in the fall and again in the spring to determine the NO3N, NH4N and NaHCO3 extractable P content. The change in nutrient content of the soil between fall and spring was measured and related to the fall sampling values and to climatic conditions between samplings. The samples were taken for each 10 yr at several sites on different soil types. The average of all sites showed little change in the P content of the soil from fall to spring. There was some increase in NO3-N, particularly in the 0- to 60-cm depth but there was a larger decrease in NH4-N, resulting in a net decrease of N (NO3-N + NH4-N) or total available mineral nitrogen from fall to spring. The amount of change in NO3-N, NH4-N and the combination of these two (N) was inversely related to the amount of that form of nitrogen present in the soil in the fall. Weather also affected the amount of change. Consideration of the amount of nitrogen present in the fall and the weather from fall to spring will improve the accuracy of predicting the amount that will be present at seeding time.

Phytochemical Investigation of Zanthoxylum armatum in NF1-Dependent Tumors

Planta Medica ◽  
2012 ◽  
Vol 78 (05) ◽  
Author(s):  
KP Devkota ◽  
JB McMahon ◽  
JA Beutler
Keyword(s):  
Zanthoxylum Armatum ◽  
Phytochemical Investigation

Influence of increased nutrient supply on Microcystis aeruginosa at cellular and proteomic levels

2020 ◽  
Vol 85 ◽  
pp. 47-58
Author(s):  
Y Jiang ◽  
Y Liu
Keyword(s):  
Microcystis Aeruginosa ◽  
Regulatory Protein ◽  
Acid Synthesis ◽  
Nutrient Supply ◽  
Nitrogen Supply ◽  
Nitrogen And Phosphorus ◽  
Comprehensive Description ◽  
Amino Acid Synthesis ◽  
High Nutrient ◽  
Proteomic Responses

Various studies have observed that increased nutrient supply promotes the growth of bloom-forming cyanobacteria, but only a limited number of studies have investigated the influence of increased nutrient supply on bloom-forming cyanobacteria at the proteomic level. We investigated the cellular and proteomic responses of Microcystis aeruginosa to elevated nitrogen and phosphorus supply. Increased supply of both nutrients significantly promoted the growth of M. aeruginosa and the synthesis of chlorophyll a, protein, and microcystins. The release of microcystins and the synthesis of polysaccharides negatively correlated with the growth of M. aeruginosa under high nutrient levels. Overexpressed proteins related to photosynthesis, and amino acid synthesis, were responsible for the stimulatory effects of increased nutrient supply in M. aeruginosa. Increased nitrogen supply directly promoted cyanobacterial growth by inducing the overexpression of the cell division regulatory protein FtsZ. NtcA, that regulates gene transcription related to both nitrogen assimilation and microcystin synthesis, was overexpressed under the high nitrogen condition, which consequently induced overexpression of 2 microcystin synthetases (McyC and McyF) and promoted microcystin synthesis. Elevated nitrogen supply induced the overexpression of proteins involved in gas vesicle organization (GvpC and GvpW), which may increase the buoyancy of M. aeruginosa. Increased phosphorus level indirectly affected growth and the synthesis of cellular substances in M. aeruginosa through the mediation of differentially expressed proteins related to carbon and phosphorus metabolism. This study provides a comprehensive description of changes in the proteome of M. aeruginosa in response to an increased supply of 2 key nutrients.

Method application of optimal multi-parameter analysis to assess the distribution of water masses as an example of CTD data of the Barents Sea in summer 2017

2019 ◽  
pp. 38-51
Author(s):  
Valeriy G. Yakubenko ◽  
Anna L. Chultsova
Keyword(s):  
Barents Sea ◽  
Field Measurements ◽  
Structural Similarity ◽  
Water Masses ◽  
Parameter Analysis ◽  
Water Dynamics ◽  
Phosphorus Concentration ◽  
Nitrogen And Phosphorus ◽  
The Barents Sea ◽  
Expert Assessments

Identification of water masses in areas with complex water dynamics is a complex task, which is usually solved by the method of expert assessments. In this paper, it is proposed to use a formal procedure based on the application of the method of optimal multiparametric analysis (OMP analysis). The data of field measurements obtained in the 68th cruise of the R/V “Academician Mstislav Keldysh” in the summer of 2017 in the Barents Sea on the distribution of temperature, salinity, oxygen, silicates, nitrogen, and phosphorus concentration are used as a data for research. A comparison of the results with data on the distribution of water masses in literature based on expert assessments (Oziel et al., 2017), allows us to conclude about their close structural similarity. Some differences are related to spatial and temporal shifts of measurements. This indicates the feasibility of using the OMP analysis technique in oceanological studies to obtain quantitative data on the spatial distribution of different water masses.

Abrasive wear of polymer/steel gear drives

2008 ◽  
Vol 4 (1) ◽  
pp. 1-26
Author(s):  
Gábor Kalácska
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Material Selection ◽  
Solid Particles ◽  
Soil Types ◽  
General View ◽  
Modern Engineering ◽  
Clean Environment ◽  
Engineering Polymers ◽  
Plastic Gears

Research was performed on the friction, wear and efficiency of plastic gears made of modern engineering polymers and their composites both in a clean environment (adhesive sliding surfaces) and in an environment contaminated with solid particles and dust (abrasive), with no lubrication at all. The purpose is to give a general view about the results of abrasive wear tests including seven soil types as abrasive media. At the first stage of the research silicious sand was applied between the meshing gears and the wear of plastic and steel gears was evaluated and analyzed from the point of different material properties (elongation at break, hardness, yield stress, modulus of elasticity) and its combinations. The different correlations between the experienced wear and material features are also introduced. At the second stage of the project the abrasive sand was replaced with different physical soil types. The abrasive wear of gears is plotted in the function of soil types. The results highlight on the considerable role of physical soil types on abrasive wear resistance and the conclusions contain the detailed wear resistance. The results offer a new tribology database for the operation and maintenance of agricultural machines with the opportunity of a better material selection according to the dominant soil type. This can finally result longer lifetime and higher reliability of wearing plastic/steel parts.

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