scholarly journals Single and Binary Fe- and Al-hydroxides Affect Potential Phosphorus Mobilization and Transfer from Pools of Different Availability

Soil Systems ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 33
Author(s):  
Stella Gypser ◽  
Elisabeth Schütze ◽  
Dirk Freese
Keyword(s):  
Soil Fertility ◽  
Organic Compounds ◽  
Influencing Factors ◽  
Malic Acid ◽  
Agricultural Productivity ◽  
Steric Effects ◽  
Mixture Ratio ◽  
Model Substances ◽  
Inorganic Constituents ◽  
P Desorption

Phosphorus (P) fixation is a global problem for soil fertility and negatively impacts agricultural productivity. This study characterizes P desorption of already fixed P by using KCl, KNO3, histidine, and malic acid as inorganic and organic compounds, which are quite common in soil. Goethite, gibbsite, and ferrihydrite, as well as hydroxide mixtures with varying Fe- and Al-ratio were selected as model substances of crystalline and amorphous Fe- and Al-hydroxides. Especially two- and multi-component hydroxide systems are common in soils, but they have barely been included in desorption studies. Goethite showed the highest desorption in the range from 70.4 to 81.0%, followed by gibbsite with values in the range from 50.7 to 42.6%. Ferrihydrite had distinctive lower desorption in the range from 11.8 to 1.9%. Within the group of the amorphous Fe-Al-hydroxide mixtures, P desorption was lowest at the balanced mixture ratio for 1 Fe: 1 Al, increased either with increasing Fe or Al amount. Precipitation and steric effects were concluded to be important influencing factors. More P was released by crystalline Fe-hydroxides, and Al-hydroxides of varying crystallinity, but desorption using histidine and malic acid did not substantially influence P desorption compared to inorganic constituents.

scholarly journals Production of Bio-Fertilizer through Composting of Tannery Wastes with CowDung and Rice Bran

2021 ◽  
Vol 6 (1) ◽  
pp. 1-10
Author(s):  
Z. N. Lambu ◽  
◽  
U. Shamsuddeen ◽  
S. Yahaya ◽  
A. S. Aliyu ◽  
...  
Keyword(s):  
Soil Fertility ◽  
Key Words ◽  
Electric Conductivity ◽  
Organic Compounds ◽  
Rice Bran ◽  
C:N Ratio ◽  
Cow Dung ◽  
Copper Zinc ◽  
Tannery Wastes ◽  
Total Concentrations

Tannery waste is made from nutrients and organic compounds that enhance soil fertility thereby improving plants and microbial growths. This study was designed to investigate the application of tannery wastes to form compost material in a mixture with cow-dung and rice brand. The treatments were prepared and tested for a period of sixty (60) days. The compost was characterized by electric conductivity (EC) of 10.11µs/cm, pH of 7.62 and Carbon-Nitrogen (C:N) ratio of 28.8. Total concentrations of Chromium, Lead, Cadmium, Copper, Zinc and Iron in mg/kg were 57.2, 0.92, 12.50, 60.50, 13.60 and 1101.00 respectively. However, total bacterial counts decreased from 8.2 x108 cfu/g to 1.8 x106 cfu/g after the 60days. The compost characteristics indicate about 80% germination index which may suggest the removal of most of the phototoxic compounds. Key words: Composting, Tannery wastes, bio-fertilizer

scholarly journals An Analysis on the Influencing Factors of the World Food Price

2019 ◽  
Vol 5 (2) ◽  
pp. 35
Author(s):  
Fang Min
Keyword(s):  
Exchange Rate ◽  
Influencing Factors ◽  
Food Consumption ◽  
Food Production ◽  
Agricultural Productivity ◽  
Food Prices ◽  
Food Price ◽  
World Food ◽  
The World ◽  
The Exchange Rate

The paper analyzes influencing factors of the world food price by using the data from 1964 to 2013. There is cointegration relationship between the world food price, world agricultural productivity, world food production, food consumption, food inventory, world oil prices, and the exchange rate of dollar. The world agricultural productivity, world food production and the exchange rate of dollar have significantly negative effect on the world food price. The world food consumption has significantly positive impact on the word food price. The impact of the world food stock and the world crude oil price on world food prices is not statistically significant. The elasticity of world food production on the world food price is less than the elasticity of world food consumption. To improve the agricultural productivity, increase food production is the key measure to stabilize the world food prices.

Steric Effects in the Electronic Spectra of Organic Compounds

Nature ◽  
1954 ◽  
Vol 173 (4394) ◽  
pp. 117-119 ◽  
Author(s):  
E. A. BRAUDE ◽  
F. SONDHEIMER ◽  
W. F. FORBES
Keyword(s):  
Organic Compounds ◽  
Electronic Spectra ◽  
Steric Effects

Partial molal volumes of organic compounds in carbon tetrachloride. 3. Aromatic hydrocarbons: steric effects

1979 ◽  
Vol 44 (6) ◽  
pp. 950-953 ◽  
Author(s):  
Fereidoon Shahidi ◽  
Patrick G. Farrell ◽  
John T. Edward ◽  
Persephone Canonne
Keyword(s):  
Carbon Tetrachloride ◽  
Organic Compounds ◽  
Aromatic Hydrocarbons ◽  
Steric Effects ◽  
Partial Molal Volumes ◽  
Molal Volumes

scholarly journals Land Degradation Situation in Bangladesh and Role of Agroforestry

1970 ◽  
Vol 4 (1) ◽  
pp. 19-25 ◽  
Author(s):  
MK Hasan ◽  
AKM Ashraful Alam
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Soil Fertility ◽  
Key Words ◽  
Land Degradation ◽  
Agricultural Production ◽  
Agricultural Productivity ◽  
Soil Health ◽  
The World

Degradation of land is a vital issue throughout the world with the particular references to Bangladesh as it a threat to agricultural productivity. Agroforestry, a land use system is being popular in many countries to protect the land from various types of degradation. Studies have proved that agroforestry can check soil erosion to some extent, increase soil fertility, reduce salinity, alkalinity, acidity and desertification etc. ultimately improve soil health which keep the land suitable for agricultural production. The article has drawn on the basis of various reviews focusing the land degradation situation of Bangladesh and potentialities of agroforsetry. Key words: Land degradation, desertification, agroforestry.

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