scholarly journals The Relationship between Natural Radioactivity of Al-Rohban Soil in Al-Najaf Governorate and Its Microbial Content

2021 ◽  
pp. 3384-3391
Author(s):  
Samah O. Al-Rammahi ◽  
Huda M. Mahmood ◽  
Alia F. Hachim
Keyword(s):  
Hpge Detector ◽  
Surface Soil ◽  
Soil Layer ◽  
Total Cell ◽  
Total Cell Count ◽  
City Center ◽  
Γ Ray ◽  
Surface Soil Layer ◽  
Bacterial Content ◽  
The Relationship

    The present study was designed to explore the relationship between radioactivity at Al-Rohban soil in Al-Najaf Governorate, located 30 km away from Najaf city center, and its microbial content. The radiological survey was conducted by γ–ray spectrometry, using purity Germanium (HPGe) detector. A selected surface soil layer (10 cm depth, 50 and 100 m expansion) was tested. The physical analyses were conducted in the Ministry of Environment, Center for Prevention of Radiation. The results showed that the estimated concentrations of Bi-214, Ra-226, Ac-228, Th-232, K-40 and Cs-137 were 47.93, 81.87, 5.03, 1.63, 126.3 and 3.5 Bq/Kg, respectively. Isotopes average concentrations were equivalent to the lowest specified International Atomic Energy standards. As related to the analysis of bacterial content in the soil sample, the total cell count (in cells per gram of soil) in the different areas studied (R1, R2, R3 and R4) had values of 70000, 200, 60000 and 300 cell/gm., respectively. The statistical analysis of these results revealed no relationship between radioactivity and microorganisms existence.

Relationship Between Soil Properties and the Growth of Legumes on Acid Wodjil Soils in Western Australia

1985 ◽  
Vol 33 (3) ◽  
pp. 299 ◽  
Author(s):  
R Snowball ◽  
AD Robson
Keyword(s):  
Soil Properties ◽  
Western Australia ◽  
Surface Soil ◽  
Soil Layer ◽  
Trifolium Subterraneum ◽  
Chloride Content ◽  
Aluminium Toxicity ◽  
Low Ph ◽  
Surface Soil Layer ◽  
The Relationship

The relationship between vegetation and soil properties in part of the eastern wheatbelt of Western Australia was investigated. Soil in the Burracoppin Reserve supporting wodjil vegetation (Acacia beauverdiana, A. signata and Allocasuarina corniculata) had a very low pH in the 4.3-5.0 cm surface soil layer, a very low level of mineralizable N and a low chloride content compared to soils supporting Eucalyptus spp. All soils were low in exchangeable potassium and bicarbonate-extractable phosphorus. Acacia signata and Trifolium subterraneum were grown on a soil from Merredin supporting wodjil vegetation. Neither species responded markedly to lime when grown on the surface soil (0-5 cm). However, growth of both species on the subsoil (30-40 cm) was enhanced with the addition of lime. Increased growth of A. signata was probably associated with the alleviation of manganese toxicity which had been induced in this experiment. By contrast, increased growth of T. subterraneum was probably associated with the alleviation of aluminium toxicity.

Outflows of Organic Halide Precursors from Forest Regions

1989 ◽  
Vol 21 (12) ◽  
pp. 1877-1880 ◽  
Author(s):  
S. Saito ◽  
K. Hattori ◽  
T. Okumura
Keyword(s):  
Water Quality ◽  
River Basin ◽  
Surface Soil ◽  
Soil Layer ◽  
Water Quality Monitoring ◽  
Quality Monitoring ◽  
Deep Soil ◽  
Organic Halide ◽  
Forest Regions ◽  
Surface Soil Layer

Outflows of organic halide precursors (OXPs) from forest regions were studied in relation to water quality monitoring in the Yodo River basin. Firstly, the contribution of outflows from forest regions relative to the total was roughly estimated. Then equations for flows of these substances were formulated, divided into four different subflow categories: precipitation; throughfall; surface soil layer; and, deep soil layer. Finally, annual outflow loads were calculated for a test forest area.

scholarly journals Biochar induced improvement in root system architecture enhances nutrient assimilation by cotton plant seedlings

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Lei Feng ◽  
Wanli Xu ◽  
Guangmu Tang ◽  
Meiying Gu ◽  
Zengchao Geng
Keyword(s):  
Root System ◽  
System Architecture ◽  
Fine Roots ◽  
Nitrogen Assimilation ◽  
Surface Soil ◽  
Soil Layer ◽  
Root System Architecture ◽  
Seedling Stage ◽  
Agronomic Efficiency ◽  
Surface Soil Layer

Abstract Background Raising nitrogen use efficiency of crops by improving root system architecture is highly essential not only to reduce costs of agricultural production but also to mitigate climate change. The physiological mechanisms of how biochar affects nitrogen assimilation by crop seedlings have not been well elucidated. Results Here, we report changes in root system architecture, activities of the key enzymes involved in nitrogen assimilation, and cytokinin (CTK) at the seedling stage of cotton with reduced urea usage and biochar application at different soil layers (0–10 cm and 10–20 cm). Active root absorption area, fresh weight, and nitrogen agronomic efficiency increased significantly when urea usage was reduced by 25% and biochar was applied in the surface soil layer. Glutamine oxoglutarate amino transferase (GOGAT) activity was closely related to the application depth of urea/biochar, and it increased when urea/biochar was applied in the 0–10 cm layer. Glutamic-pyruvic transaminase activity (GPT) increased significantly as well. Nitrate reductase (NR) activity was stimulated by CTK in the very fine roots but inhibited in the fine roots. In addition, AMT1;1, gdh3, and gdh2 were significantly up-regulated in the very fine roots when urea usage was reduced by 25% and biochar was applied. Conclusion Nitrogen assimilation efficiency was significantly affected when urea usage was reduced by 25% and biochar was applied in the surface soil layer at the seedling stage of cotton. The co-expression of gdh3 and gdh2 in the fine roots increased nitrogen agronomic efficiency. The synergistic expression of the ammonium transporter gene and gdh3 suggests that biochar may be beneficial to amino acid metabolism.

scholarly journals Prediction of the chrome distribution in subarctic Noyabrsk using co-kriging, generalized regression neural network, multilayer perceptron, and hybrid technics

2019 ◽  
pp. 77-86
Author(s):  
A. G. Buevich ◽  
I. E. Subbotina ◽  
A. V. Shichkin ◽  
A. P. Sergeev ◽  
E. M. Baglaeva
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
Multilayer Perceptron ◽  
Surface Soil ◽  
Soil Layer ◽  
Generalized Regression Neural Network ◽  
Residual Kriging ◽  
Surface Soil Layer ◽  
Artificial Neural ◽  
Generalized Regression

Combination of geostatistical interpolation (kriging) and machine learning (artificial neural networks, ANN) methods leads to an increase in the accuracy of forecasting. The paper considers the application of residual kriging of an artificial neural network to predicting the spatial contamination of the surface soil layer with chromium (Cr). We reviewed and compared two neural networks: the generalized regression neural network (GRNN) and multilayer perceptron (MLP), as well as the combined method: multilayer perceptron residual kriging (MLPRK). The study is based on the results of the screening of the surface soil layer in the subarctic Noyabrsk, Russia. The models are developed based on computer modeling with minimization of the RMSE. The MLPRK model showed the best prognostic accuracy.

scholarly journals Fertilization of high-yield corn with poultry litter based on nitrogen doses

2018 ◽  
Vol 53 (3) ◽  
pp. 342-350 ◽  
Author(s):  
Juliano Corulli Corrêa ◽  
Marco André Grohskopf ◽  
Agostinho Rebellatto ◽  
Amanda Zolet Rigo ◽  
Arlei Coldebella
Keyword(s):  
Surface Soil ◽  
Poultry Litter ◽  
Soil Layer ◽  
Mineral Fertilizer ◽  
Organic Fertilizers ◽  
High Yield ◽  
No Tillage ◽  
Corn Crop ◽  
Surface Soil Layer ◽  
N Requirement

Abstract: The objective of this work was to recommend nitrogen doses from poultry litter-based organic fertilizers in powder and pellet forms, compared with mineral fertilizer, in a high-yield corn crop under no-tillage. The treatments consisted of a 3×3+1 factorial arrangement, with: three fertilizers, two organic derived from poultry litter in powder (OPo) and pelletized (OPe) forms and one mineral fertilizer (M); three N doses of 65, 100, and 135% of the recommended N requirement for corn; and an unfertilized control. After five corn crops farmed under no-tillage in a Rhodic Kandiudox, the recommended doses for fertilization with poultry litter organic fertilizers, with an expected yield equal to or greater than 8,000 kg ha-1, could be achieved from doses of 100 kg ha-1 N in OPe and M and of 121 kg ha-1 N in OPo. Increasing doses of the OPe, OPo, and M fertilizers raise the contents of organic carbon, N, and available P in the surface soil layer (0.0-0.1 m) and of exchangeable K up to a depth of 0.2 m, allowing to obtain N, P, and K contents in the plant tissue within the sufficiency range of the corn crop.

Coupling effect of water and nitrogen on the morphology and distribution of fine root in surface soil layer of youngPopulus×euramericanaplantation

2015 ◽  
Vol 35 (11) ◽  
Author(s):  
闫小莉 YAN Xiaoli ◽  
戴腾飞 DAI Tengfei ◽  
邢长山 XING Changshan ◽  
贾黎明 JIA Liming ◽  
张龙宁 ZHANG Longning
Keyword(s):  
Surface Soil ◽  
Fine Root ◽  
Coupling Effect ◽  
Soil Layer ◽  
Effect Of Water ◽  
Surface Soil Layer
Sign in / Sign up

Export Citation Format

Share Document