scholarly journals The influence of various organic amendments on the bioavailability and plant uptake of cadmium present in mine-degraded soil

2018 ◽  
Vol 636 ◽  
pp. 810-817 ◽  
Author(s):  
Muhammad Amjad Khan ◽  
Xiaodong Ding ◽  
Sardar Khan ◽  
Mark L. Brusseau ◽  
Anwarzeb Khan ◽  
...  
Keyword(s):  
Plant Uptake ◽  
Organic Amendments ◽  
Degraded Soil

scholarly journals Understanding Soil Phosphorus

2019 ◽  
pp. 1-18
Author(s):  
Esther Mwende Muindi
Keyword(s):  
Plant Uptake ◽  
Soil Phosphorus ◽  
Organic Amendments ◽  
Clay Mineralogy ◽  
Fertilizer Application ◽  
Acidic Soils ◽  
Tillage Practices ◽  
P Fertilizer ◽  
Soil Temperatures ◽  
Division Cell

Phosphorus is the second most important crop nutrient after Nitrogen. It is an essential macronutrient that plays important role in all crop biochemical processes such as photosynthesis, respiration, energy storage, transfer, cell division, cell enlargement and nitrogen fixation. It is also important in seed germination, seedling establishment, root, shoot, flower and seed development. Despite its importance in crop nutrition, availability of the nutrient in soils for plant uptake is limited by several soil factors. The factors include: soil pH levels, clay mineralogy, organic matter, free iron and aluminium, calcium carbonate, soil temperatures and availability of other nutrients among other factors. Availability of phosphorus for plant uptake can be managed by adoption of practices such as liming acidic soils, application of organic amendments in both alkaline and acidic soils, tillage practices and regulation of time and method of P fertilizer application.

scholarly journals Effect of Chelant-Based Soil Washing and Post-Treatment on Pb, Cd, and Zn Bioavailability and Plant Uptake

2021 ◽  
Vol 232 (10) ◽  
Author(s):  
Christoph Noller ◽  
Wolfgang Friesl-Hanl ◽  
Rebecca Hood-Nowotny ◽  
Markus Puschenreiter ◽  
Andrea Watzinger
Keyword(s):  
Plant Uptake ◽  
Total Concentration ◽  
Soil Washing ◽  
Organic Amendments ◽  
Ex Situ ◽  
Metal Availability ◽  
Soil Extracts ◽  
Aqua Regia ◽  
Edta Complexes ◽  
Zn Bioavailability

Abstract The remediation of Pb, Cd, and Zn contaminated soil by ex situ EDTA washing was investigated in two pot experiments. We tested the influence of (i) 0, 0.5, 1.0, and 1.5%wt zero-valent iron (ZVI) and (ii) a combination of 5%wt vermicompost, 2%wt biochar, and 1%wt ZVI on the metal availability in EDTA-washed soil using different soil extracts (Aqua regia, NH4NO3) and plant concentrations. We found that EDTA soil washing significantly reduced the total concentration of Pb, Cd, and Zn and significantly reduced the Cd and Zn plant uptake. Residual EDTA was detected in water extracts causing the formation of highly available Pb-EDTA complexes. While organic amendments had no significant effect on Pb behavior in washed soils, an amendment of ≥ 1%wt ZVI successfully reduced EDTA concentrations, Pb bioavailability, and plant uptake. Our results suggest that Pb-EDTA complexes adsorb to a Fe oxyhydroxide layer, quickly developing on the ZVI surface. The increase in ZVI application strongly decreases Zn concentrations in plant tissue, whereas the uptake of Cd was not reduced, but even slightly increased. Soil washing did not affect plant productivity and organic amendments improved biomass production.

Effect of ammonium, organic amendments, and plant growth on soil pH stratification

Soil Research ◽  
1998 ◽  
Vol 36 (4) ◽  
pp. 641 ◽  
Author(s):  
C. M. Evans ◽  
M. K. Conyers ◽  
A. S. Black ◽  
G. J. Poile
Keyword(s):  
Ammonium Sulfate ◽  
Plant Uptake ◽  
Field Trial ◽  
Organic Amendments ◽  
Growing Season ◽  
Nitrogen Transformations ◽  
Soil Layers ◽  
Initial Ph ◽  
Soil Substrates ◽  
Sampling Times

We studied the development of soil layers of different pH (strata) within the surface 10 cm of soil. Substrates which affect nitrogen transformations (ammonium sulfate, sucrose, and lucerne hay) were added to the soil to determine the effect of amendment on the development of pH stratification. A glasshouse experiment used soils of 3 different initial pH(0·01 CaCl2; pHCa) values: 4, 5, and 6. At the end of the experiment, soil was sampled in depth intervals of 0·5 cm between 0 and 2 cm depth and then 1-cm intervals between 2 and 10 cm depth. Soil pHCa decreased over time and pHCa changes could be explained by variations in the concentration of ammonium and nitrate, which were brought about by changes in the rate of mineralisation, nitrification, and plant uptake of nitrogen. Little stratification in soil pHCa was found within the 0–10 cm layer. This minimal stratification was considered to be due to the soil in the pots being a closed system where nitrate was not lost through leaching. A field trial was rotary hoed to a depth of approximately 10 cm to achieve adequate mixing of soil and amendments. Soil pHCa decreased over the 6 months of the growing season, ranging from 0·1 pHCa units in the control to 0·4 pHCa units in the hay amendment. Between the initial and final sampling times there was little change in soil pHCa in the surface 0–2 cm. The pHCa decreased in the layers between 2 and 10 cm, thus producing the stratification of soil pHCa. The growth of oats had little effect on the development of pHCa stratification. Decreases in the soil pHCa from the 0–2 cm to the 8–10 cm layer in the absence of plants were 0·22, 0·27, 0·30, and 0·51 for the control, added sucrose, added ammonium sulfate, and added hay amendments, respectively. The processes of mineralisation and nitrification were considered to be the major causes of change in soil pHCa. Stratification of pHCa in the field trial was attributed to nitrification followed by nitrate leaching in the open system.

Application of organic amendments to restore degraded soil: effects on soil microbial properties

2015 ◽  
Vol 187 (3) ◽  
Author(s):  
Jennifer Carlson ◽  
Jyotisna Saxena ◽  
Nicholas Basta ◽  
Lakhwinder Hundal ◽  
Dawn Busalacchi ◽  
...  
Keyword(s):  
Organic Amendments ◽  
Degraded Soil ◽  
Microbial Properties ◽  
Soil Microbial ◽  
Soil Effects ◽  
Soil Microbial Properties

scholarly journals Effects of Spent Mushroom Compost on Physicochemical Properties of Degraded Soil

2016 ◽  
Author(s):  
İlknur Gümüş ◽  
Cevdet Şeker
Keyword(s):  
Physicochemical Properties ◽  
Organic Amendments ◽  
Aggregate Stability ◽  
Field Capacity ◽  
Modulus Of Rupture ◽  
Laboratory Studies ◽  
Mushroom Compost ◽  
Degraded Soil ◽  
Spent Mushroom Compost ◽  
Incubation Periods

Abstract. Land and laboratory studies show that the application of organic amendments into the soil improves the physicochemical properties of it. The study aims to study explore spent mushroom compost (SMC) application on the physicochemical properties in weak-structured degraded soil. The approach involved establishing a plot experiment under laboratory conditions with spent mushroom compost applications (control, 0.5 %, 1 %, 2 %, 4 % and 8 %), soil samples were incubated at field capacity for 21, 42, and 62 days. Spent mushroom compost applications into the soil significantly increased the aggregate stability (AS) and decreased the modulus of rupture. Application of SMC at the rate of 1 %, 2 %, 4 %, and 8 % were significantly increased the total nitrogen (N) and soil organic carbon (SOC) contents of the degraded soil at all incubation periods (p 

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