scholarly journals Cocoa Cortex Ashes as Fluxing Additive for Vitrified Ceramic Making from Alluvial Clay

2019 ◽  
Vol 07 (10) ◽  
pp. 24-39
Author(s):  
E. J. A. Ndzana ◽  
D. Njoya ◽  
A. Elimbi ◽  
G. V. Ranaivoarivo ◽  
G. Lecomte-Nana ◽  
...  
Keyword(s):  
Alluvial Clay

Micromorphology and Stable-Isotope Geochemistry of Historical Pedogenic Siderite Formed in PAH-Contaminated Alluvial Clay Soils, Tennessee, U.S.A.

2010 ◽  
Vol 80 (11) ◽  
pp. 943-954 ◽  
Author(s):  
S. G. Driese ◽  
G. A. Ludvigson ◽  
J. A. Roberts ◽  
D. A. Fowle ◽  
L. A. Gonzalez ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Isotope Geochemistry ◽  
Clay Soils ◽  
Stable Isotope Geochemistry ◽  
Alluvial Clay

Efficacy of reduced-rate herbicide combinations in dry-seeded rice (Oryza sativa) on alluvial clay soil

Weed Science ◽  
1997 ◽  
Vol 45 (1) ◽  
pp. 151-157 ◽  
Author(s):  
David L. Jordan
Keyword(s):  
Water Management ◽  
Oryza Sativa ◽  
Environmental Conditions ◽  
Management Practices ◽  
Clay Soil ◽  
Rice Yield ◽  
Economic Returns ◽  
Economic Return ◽  
Reduced Rate ◽  
Alluvial Clay

Research was conducted from 1993 through 1995 to evaluate barnyardgrass control, rice yield, and estimated economic return with POST applications of propanil or propanil + molinate applied alone or with quinclorac. Herbicides were applied under a variety of water management practices and environmental conditions at rates ranging from 1.1 to 3.4, 1.7 to 5.6, and 0.17 to 0.40 kg ai ha−1for propanil, propanil + molinate, and quinclorac, respectively. Reduced-rate combinations of propanil or propanil + molinate with reduced rates of quinclorac controlled small, actively growing barnyardgrass and provided yields and estimated economic returns similar to combinations of these herbicides at higher rates when irrigated. When herbicides were applied to larger barnyardgrass, propanil + molinate at 5.6 kg ha−1was more effective than propanil at 3.4 kg ha−1or quinclorac at 0.40 kg ha−1applied alone. Propanil + molinate applied with quinclorac at 0.28 or 0.40 kg ha−1controlled barnyardgrass more effectively and provided higher yields and greater estimated economic returns than propanil at 3.4 kg ha−1, propanil + molinate at 5.6 kg ha−1, quinclorac at 0.17, 0.28, or 0.40 kg ha−1, or combinations of propanil and quinclorac.

Phosphorus export from coastal plain drainage into the Peel-Harvey estuarine system of Western Australia

1982 ◽  
Vol 33 (1) ◽  
pp. 23 ◽  
Author(s):  
PB Birch
Keyword(s):  
Western Australia ◽  
Coastal Plain ◽  
Dairy Farms ◽  
Dairy Farming ◽  
Benthic Alga ◽  
Clay Soils ◽  
Estuarine System ◽  
Phosphorus Export ◽  
Alluvial Clay

Excessive growth of the benthic alga Cladophora aff. albida in the Peel-Harvey estuarine system has coincided with greatly increased inputs of phosphorus from rivers over the last 20-25 years. At present, about 90%, of phosphorus input is derived from rural coastal plain catchments, where use of superphosphate increased fourfold over the period 1945-1975. The present export of phosphorus from these catchments was found to be positively correlated with rates of superphosphate application, dairy farming, and presence of alluvial clay soils, and negatively correlated with beef farming. Reduction of phosphorus input to the estuary from the coastal plain, therefore, could be achieved by reducing or modifying the present use of superphosphate, and reducing runoff from dairy farms into waterways.

MICROMORPHOLOGY OF SOME TROPICAL ALLUVIAL CLAY SOILS

1970 ◽  
Vol 21 (2) ◽  
pp. 233-241 ◽  
Author(s):  
S. SLAGER ◽  
A. G. JONGMANS ◽  
L. J. PONS
Keyword(s):  
Clay Soils ◽  
Alluvial Clay

scholarly journals Surface irrigation management in relation to water infiltration and distribution in soils

2010 ◽  
Vol 5 (No. 3) ◽  
pp. 75-87 ◽  
Author(s):  
A.M. Amer ◽  
K.H. Amer
Keyword(s):  
Soil Water ◽  
Control Method ◽  
Irrigation System ◽  
Irrigation Management ◽  
Furrow Irrigation ◽  
Water Infiltration ◽  
Surface Irrigation ◽  
Empirical Power ◽  
And Storage ◽  
Alluvial Clay

Water infiltration and storage under surface irrigation are evaluated, based on the initial soil water content and inflow rate as well as on the irrigation parameters and efficiencies. For that purpose, a field experiment was conducted using fruitful grape grown in alluvial clay soil at Shebin El-Kom in 2008 grape season. To evaluate the water storage and distribution under partially wetted furrow irrigation in comparison to the traditional border irrigation as a control method, two irrigation treatments were applied. They are known as wet (WT) and dry (DT) treatments, at which water was applied when the available soil water (ASW) reached 65% and 50%, respectively. The coefficient of variation (CV) was 6.2 and 10.2% for WT and DT respectively under the furrow irrigation system as compared to 8.5% in border. Water was deeply percolated as 11.9 and 18.9% for wet and dry furrow treatments respectively, as compared with 11.1% for control with no deficit. The application efficiency achieved was 86.2% for wet furrow irrigation achieving a high grape yield (30.7 t/ha). The relation between the infiltration (cumulative depth, Z and rate, I) and opportunity time (t<sub>0</sub>) in minutes for WT and DT treatments was: Z<sub>WT</sub> = 0.528 t<sub>0</sub><sup>0.6</sup>, Z<sub>DT</sub> = 1.2 t<sub>0</sub><sup>0.501</sup>, I<sub>WT</sub> = 19 t<sub>0</sub><sup>&ndash;0.4</sup>, I<sub>DT</sub> = 36 t<sub>0</sub><sup>&ndash;0.498</sup>. Also, empirical power form equations were obtained for the measured advance and recession times along the furrow length during the irrigation stages of advance, storage, depletion, and recession.

Fate of applied biosolids nitrogen in a cut and remove forage system on an alluvial clay loam soil

Soil Research ◽  
2008 ◽  
Vol 46 (8) ◽  
pp. 703 ◽  
Author(s):  
Guixin Pu ◽  
Mike Bell ◽  
Glenn Barry ◽  
Peter Want
Keyword(s):  
Significant Proportion ◽  
Application Rate ◽  
Organic N ◽  
Clay Loam ◽  
Forage Production ◽  
Clay Loam Soil ◽  
Mineral N ◽  
Loam Soil ◽  
Biosolids Application ◽  
Alluvial Clay

The fate of nitrogen (N) applied in biosolids was investigated in a forage production system on an alluvial clay loam soil in south-eastern Queensland, Australia. Biosolids were applied in October 2002 at rates of 6, 12, 36, and 54 dry t/ha for aerobically digested biosolids (AE) and 8, 16, 48, and 72 dry t/ha for anaerobically digested biosolids (AN). Rates were based on multiples of the Nitrogen Limited Biosolids Application rate (0.5, 1, 3, and 4.5NLBAR) for each type of biosolid. The experiment included an unfertilised control and a fertilised control that received multiple applications of synthetic fertiliser. Forage sorghum was planted 1 week after biosolids application and harvested 4 times between December 2002 and May 2003. Dry matter production was significantly greater from the biosolids-treated plots (21–27 t/ha) than from the unfertilised (16 t/ha) and fertilised (18 t/ha) controls. The harvested plant material removed an extra 148–488 kg N from the biosolids-treated plots. Partial N budgets were calculated for the 1NLBAR and 4.5NLBAR treatments for each biosolids type at the end of the crop season. Crop removal only accounted for 25–33% of the applied N in the 1NLBAR treatments and as low as 8–15% with 4.5NLBAR. Residual biosolids N was predominantly in the form of organic N (38–51% of applied biosolids N), although there was also a significant proportion (10–23%) as NO3-N, predominantly in the top 0.90 m of the soil profile. From 12 to 29% of applied N was unaccounted for, and presumed to be lost as gaseous nitrogen and/or ammonia, as a consequence of volatilisation or denitrification, respectively. In-season mineralisation of organic N in biosolids was 43–59% of the applied organic N, which was much greater than the 15% (AN)–25% (AE) expected, based on current NLBAR calculation methods. Excessive biosolids application produced little additional biomass but led to high soil mineral N concentrations that were vulnerable to multiple loss pathways. Queensland Guidelines need to account for higher rates of mineralisation and losses via denitrification and volatilisation and should therefore encourage lower application rates to achieve optimal plant growth and minimise the potential for detrimental impacts on the environment.

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