Abstarct

Laboratory experiment was conducted using silty clay loam soil collected from Agriculture fields in Abu Ghraib to study the release of phosphorus from rock phosphate (10.22 P%) on a soil treated with three types of organic fertilizers namely; peat moss , sheep manure , poultry manure and control treatment (soil only). Ten grams of air dried soil mixed with 100 mg of ground rock phosphate and organic fertilizers added at 2.5% level (w:w) were incubated at a laboratory temperature (298 K ) after adding water up to two-thirds of the field capacity for 40, 90, 120, 150 and 180 days. Citric acide soluble available phosphorous was estimated after each incubation periods and kinetic equations used to test its release from treated samples. The additions of chicken manure was the highest in the amount of dissolved phosphorus values followed by sheep manure, peat moss, rock phosphate and control treatment, reaching levels of citric acide extractable phosphorus to 4.2 , 3.8, 3.3, 3.1 and 2.5 mg P kg-1 soil, respectively. The results also showed superiority of first order equation in the description of phosphorus release from rock phosphate with release rate coefficient of 3.801 , 3.865 , 4.328 and 4.366 mg P kg -1 soil h-1 for the treatments: soil and rock phosphate only , peat moss, sheep waste and chicken manure, respectively.

Keywords

Export bibliographic record

Choose an application

• Reference Manager
• EndNote
• BibTex

Abstarct

A laboratory experiment was carried out at the Department of Soil Sciences and Water Resources, College of Agriculture, University of Baghdad. Silty clay soil was treated with three salt solutions (NaCl, CaCl2 and mixed NaCl–CaCl2). Homogeneously packed soil columns (10 cm, 40 cm) were leached six times using tap water. Effluent samples were collected to determine ion concentration Cl-, Ca++, Na+, K+ and Mg++. Breakthrough curves were used to estimate solute transport parameters (retardation factor, peclet number) using an analytical solution of convection-dispersion equation (CDE) by CXTFIT program. The results showed that relative concentration of chloride was increased rapidly with calcium chloride, which increased sodium leaching rate at starting of breakthrough curve. Sodium chloride increased water requirements for calcium displacement. Results indicated a good fitting of convection-dispersion equation with breakthrough curves data. The best-fit were used to calculate peclet number, retardation factor and dispersion coefficient. When soil was treated with calcium chloride, Peclet number of chloride was increased from 3.13 to 6.48, while it has been decreased for calcium, sodium and potassium. Sodium chloride decreased peclet numbers of chloride, calcium and sodium. Also mixed salts increased sodium peclet number from 1.01 to 9.02. Results showed, calcium chloride decreased retardation factor of chloride from 1.59 to 0.50, while it has been increased from 1.39, 1.58 to 175.00, 493.36 for each of sodium and potassium, respectively. Retardation factor of calcium was decreased when soil was treated with sodium chloride or mixed salts. Dispersion coefficient was decreased for chloride, and increased for calcium and magnesium. When soil was treated with calcium chloride, dispersion coefficients have been increased from 24.29, 25.56 to 40.51, 40.89 cm2hr-1 for sodium and potassium, respectively.

Keywords

Export bibliographic record

Choose an application

• Reference Manager
• EndNote
• BibTex

Abstarct

A laboratory experiment was carried out at the Department of Soil Sciences and Water Resources, College of Agriculture, University of Baghdad. Silty clay soil was treated with three salt solutions (NaCl, CaCl2 and mixed NaCl–CaCl2). Homogeneously packed soil columns (10 cm, 40 cm) were leached six times using tap water. Effluent samples were collected to determine ion concentration Cl-, Ca++, Na+, K+ and Mg++. Breakthrough curves were used to estimate solute transport parameters (retardation factor, peclet number) using an analytical solution of convection-dispersion equation (CDE) by CXTFIT program. The results showed that relative concentration of chloride was increased rapidly with calcium chloride, which increased sodium leaching rate at starting of breakthrough curve. Sodium chloride increased water requirements for calcium displacement. Results indicated a good fitting of convection-dispersion equation with breakthrough curves data. The best-fit were used to calculate peclet number, retardation factor and dispersion coefficient. When soil was treated with calcium chloride, Peclet number of chloride was increased from 3.13 to 6.48, while it has been decreased for calcium, sodium and potassium. Sodium chloride decreased peclet numbers of chloride, calcium and sodium. Also mixed salts increased sodium peclet number from 1.01 to 9.02. Results showed, calcium chloride decreased retardation factor of chloride from 1.59 to 0.50, while it has been increased from 1.39, 1.58 to 175.00, 493.36 for each of sodium and potassium, respectively. Retardation factor of calcium was decreased when soil was treated with sodium chloride or mixed salts. Dispersion coefficient was decreased for chloride, and increased for calcium and magnesium. When soil was treated with calcium chloride, dispersion coefficients have been increased from 24.29, 25.56 to 40.51, 40.89 cm2hr-1 for sodium and potassium, respectively.

Keywords

Export bibliographic record

Choose an application

• Reference Manager
• EndNote
• BibTex

Abstarct

A pot experiment was carried out in a plastic house which belongs to soil and water resources Department , College of Agriculture, University of Baghdad, Al-Jadiriya campus, using Loam soil texture to evaluate efficiency of white radish and carrots plants contents of cadmium, lead, and nickel in their tissues and recognizing which most efficient in phytoremediation, besides evaluation is one of them is contamination of these plants with these elements depending on the value of concentration index according to the international parameters of pollution. Root and shoot samples were taken, to determine the concentrations of these element, bio concentration factor (BCF) and translocation factor (TF).The results showed that White radish was Superior than carrot increase of bio – concentration in shoot and root parts of plants (BCF) of Pb, Cd, Ni. TF represents the translocation of element from the root to the shoot system and it was high with Cd, Ni elements and this increase translocation of these elements from root to shoot indicates plants, while Pb movement was reduced compared with the other elements , concentrations of Pb, Cd and Ni in the shoot and root plants of white radish significantly higher than this Conant rations in carrot plants.

Keywords

Export bibliographic record

Choose an application

• Reference Manager
• EndNote
• BibTex

Abstarct

The objective of the study was to estimate the crop water requirement, water use efficiency and fertilizers productivity (agronomic efficiency) of squash under irrigation treatments and humic fertilizers. The study was carried out in the field of Agricultural Collage- University of Baghdad-Al - Jadriya during spring season 2016. Factorial experimental was used Randomized Complete Block Design including twelve treatments in three replicates. The first factor was irrigation including three treatments irrigation was imposed at 35, 50 and 70% depletion of available water, whereas the second one was organic fertilizers (humic acid) with four levels 0, 10, 20 and 30 kg ha-1. The water content of depletion water for 0-0.2m layer was calculated from planting till shoot growth and increasing of irrigation water depth to include 0-0.3m during flowering and yield formation stages. Actual evapotranspiration was estimate using water balance equation, reference evapotranspiration from modified Penman Montieth equation.ETa values recorder 440, 395 and 335 mm at 35, 50 and 70% depletion of available water, respectively, while the ETo recorder 457 mm. Application of humic acid lead to increase water use efficiency field and crop, and fertilizer productivity for all irrigation treatments and reached 6.50, 5.84 kg m-3 and 359.6, respectively under irrigation at 35% depletion available water and 30 kg ha-1 humic acid. The results showed that suffered squash to water stress lead to reduced water use efficiency, fertilizer productivity and fruit yield. The results also showed that a quality characteristic of squash was improved in response to humic acid application.

Keywords

Export bibliographic record

Choose an application

• Reference Manager
• EndNote
• BibTex