scholarly journals Empirical Models for Power and Energy Requirements II : A Powered Implement Operation in Serdang Sandy Clay Loam, Malaysia

2017 ◽  
Vol 20 (3&4) ◽  
pp. 349-360
Author(s):  
A. F. Kheiralla ◽  
A. Yahya ◽  
M. Zohadie ◽  
W. Ishak
Keyword(s):  
Regression Analysis ◽  
Fuel Consumption ◽  
Specific Energy ◽  
Travel Speed ◽  
Energy Requirements ◽  
Clay Loam ◽  
Sandy Clay Loam ◽  
Sandy Clay ◽  
Consumption Rates ◽  
Power And Energy

Power and energy requirements were measured with an instrumented tractor for rotary tilling in Serdang sandy clay loam soil.  The effects of travel speed and rotor speed upon the measured data were investigated.  Power model from orthogonal regression analysis was formulated based on linear and quadratic functions of travel speed and bite length.  Fuel consumption model from regression analysis was formulated based on linear tractor PTO power as well as linear equivalent tractor PTO power.  Fuel consumption rates predicted by ASAE D497.3 were found to be 25% to 28% overestimates of the values predicted by the model developed.  However, fuel consumption rates reported by OECD Tractor Test were found to be 1% to 9% lower than the fuel consumption rates predicted by the model developed.  A comparison of power and energy requirements for both powered and draught implements showed that the disk harrow was the most energy efficient implement in terms of fuel consumption and specific energy followed by the rotary tiller, disk plough and mouldboard.  Finally, average PTO power, fuel consumption, wheel slip, wheel power and specific energy for a powered implement are presented.

Degradation of oxyfluorfen in sandy clay loam soil

2020 ◽  
Vol 8 (6) ◽  
pp. 1038-1041
Author(s):  
C Bharathi ◽  
P Murali Arthanari ◽  
C Chinnusamy
Keyword(s):  
Clay Loam ◽  
Clay Loam Soil ◽  
Sandy Clay Loam ◽  
Sandy Clay ◽  
Loam Soil

Comparison of oxidoreductive enzyme activities in three coal tar creosote-contaminated soils

Soil Research ◽  
2019 ◽  
Vol 57 (8) ◽  
pp. 814 ◽  
Author(s):  
Arkadiusz Telesiński ◽  
Teresa Krzyśko-Łupicka ◽  
Krystyna Cybulska ◽  
Barbara Pawłowska ◽  
Robert Biczak ◽  
...  
Keyword(s):  
Contaminated Soils ◽  
Sandy Loam ◽  
Coal Tar ◽  
Loamy Sand ◽  
Clay Loam ◽  
Oxidoreductase Activity ◽  
Sandy Clay Loam ◽  
Sandy Clay ◽  
Polycyclic Aromatic ◽  
Negative Effect

This study used laboratory experiments to compare the effects of coal tar creosote on the activity of oxidoreductive enzymes in sandy loam, loamy sand and sandy clay loam soils. Different amounts of coal tar creosote were added to soil samples as follows: 0 (control), 2, 10 or 50 g kg–1 dry matter. The activity of soil dehydrogenases (DHAs), o-diphenol oxidase (o-DPO), catalase (CAT), nitrate reductase (NR) and peroxidases (POX) was determined. Contamination of soil with coal tar creosote affected oxidoreductase activity. Oxidoreductive enzyme activity following soil contamination with coal tar creosote was in the following order: DHAs > CAT > NR > POX > o-DPO in loamy sand and in sandy loam; and DHAs > POX > CAT > NR > o-DPO in sandy clay loam. The index of soil oxidoreductive activity (IOx) introduced in this study confirms the negative effect of coal tar creosote on oxidoreductase activity in soil. DHAs were the most sensitive to the contamination of soil with coal tar creosote. Moreover, the greatest changes in oxidoreductase activities were observed in loamy sand. Knowledge of the mechanism underlying the effects of coal tar creosote on oxidoreductive processes may enable development of a method for the bioremediation of polycyclic aromatic hydrocarbon-contaminated soils.

Managing organic carbon of sandy clay loam soil with organic amendments to promote particle aggregation

2021 ◽  
Vol 14 (4) ◽  
Author(s):  
Haroon Shahzad ◽  
Muhammad Iqbal ◽  
Noman Latif ◽  
Muhammad Arshad Khan ◽  
Qudrat Ullah Khan
Keyword(s):  
Organic Carbon ◽  
Organic Amendments ◽  
Particle Aggregation ◽  
Clay Loam ◽  
Clay Loam Soil ◽  
Sandy Clay Loam ◽  
Sandy Clay ◽  
Loam Soil

scholarly journals Chipping machines: disc and drum energy requirements

2013 ◽  
Vol 44 (2s) ◽  
Author(s):  
Alessio Facello ◽  
Eugenio Cavallo ◽  
Raffaele Spinelli
Keyword(s):  
Air Pollution ◽  
Fuel Consumption ◽  
Specific Energy ◽  
Processing Time ◽  
Fossil Fuel ◽  
Energy Requirements ◽  
Power Demand ◽  
Production Chain ◽  
Testing Conditions ◽  
Processed Material

Air pollution and fossil fuel reserves exhaustion are increasing the importance of the biomass-derived products, in particular wood, as source of clean and renewable energy for the production of electricity or steam. In order to improve the global efficiency and the entire production chain, we have to evaluate the energetic aspects linked to the process of transformation, handling and transport of these materials. This paper reports results on a comparison between two chippers of similar size using different cutting technology: disc and drum tool respectively. During trials, fuel consumption, PTO torque and speed, processing time and weight of processed material were recorded. Power demand, fuel consumption, specific energy and productivity were computed. The machine was fed with four different feedstock types (chestnut logs, poplar logs, poplar branches, poplar sawmill residues). 15 repetitions for each combination of feedstock-tool were carried out. The results of this study show that the disc tool requires, depending on the processed material, from 12 to 18% less fuel per unit of material processed than the drum tool, and consequently, from 12 to 16% less specific energy. In particular, the highest difference between tools was found in branches processing whereas the smallest was in poplar logs. Furthermore the results of the investigation indicate, that, in testing conditions, the productivity of drum tool is higher (8%) than disc tool.

scholarly journals Modeling phosphorus distribution under different fertigation strategies in onion (Allium cepa L.) crop

2017 ◽  
Vol 9 (2) ◽  
pp. 720-729
Author(s):  
Sanjay T. Satpute ◽  
Man Singh
Keyword(s):  
Soil Moisture ◽  
Nutrient Dynamics ◽  
Moisture Distribution ◽  
Clay Loam ◽  
Clay Loam Soil ◽  
Nutrient Distribution ◽  
Sandy Clay Loam ◽  
Phosphorus Distribution ◽  
Sandy Clay ◽  
Loam Soil

The understanding of soil and nutrient dynamics under drip fertigation is relevant for crop production as well as water and nutrient management. The aim of this study was to generate information about the distribution of phosphorus (P) under different fertigation strategies for onion production on sandy clay loam soil during 2007-2008 to 2008-2009. The study involved field experiment, laboratory analysis and modeling of P distribution. The phosphorus distribution data in the field were collected, analyzed and used to calibrate and validate the solute transport model HYDRUS-2D for sandy clay loam soil. The performance of HYDRUS-2D was evaluated by comparing its simulated values with the observed values of soil moisture and nutrient concentration. The coefficient of determination (R2), root mean square error (RMSE) and mean absolute error (MAE) were used as model performance indicators. The range of R2 between 0.72-0.99 for water as well as nutrient distribution indicates good correlation between the observed and simulated values. The MAE and RMSE values for water and nutrient distribution were in between 0.0009 to 0.0039 which indicated the accuracy of the model. From these results, it can be concluded that the model is performing well for predicting the P concentration in the soil as well as the soil moisture distribution for onion crop grown under sandy clay loam. The model was also validated for water and phosphorus distribution with the observed values at the end of the crop season and found to be performing well. The HYDRUS-2D model may be used to carry out simulations for different soil types and with different fertigation and irrigation strategies for developing guidelines.

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