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Composition of the Soil (Part Three)

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Organic Matter

The organic matter of the soil is derived mainly from decomposition of dead remains of plants and animals. Sand soils contain no organic matter; the peat soils up to 95% and ordinary agricultural soils not more than 15%.

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May 16th, 2009 at 6:43 pm

Composition of the Soil (Part Two)

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Clay Minerals and Cation Exchange

The clay particles are composed mainly of aluminium, silicon and oxygen. The micelles of colloidal clay are usually negatively charged. Some cations from the soil solution with opposite, i.e., positive charge, are associated (adsorbed) with them to form an electrical double layer as shown in the diagram below.

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May 15th, 2009 at 8:28 pm

Composition of the Soil (Part One)

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Most vascular plants are rooted in the soil from which they obtain water and mineral salts. Both water and mineral salts are essential for growth and other important physiological processes of the plant. For thorough understanding of absorption of water and mineral salts by the plant, a proper consideration of the properties of soil is required.

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May 14th, 2009 at 10:46 pm

Database Programming Using VB 6.0 (Part Three)

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Data Environment Designer

These are the steps to connect VB 6.0 with MS SQL server database using Data Environment Designer method. Data Environment Designer also helps us to generate a report using Data Report control.

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May 13th, 2009 at 10:39 pm

Database Programming Using VB 6.0 (Part Two)

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ActiveX Data Object (ADO) Control Method

These are the steps to connect the VB 6.0 with MS SQL server using ADO control:

  • Activate the Microsoft ADO control and Data Grid control 6.0 from the ActiveX components. ADO and Data Grid Control icons will become part of toolbox after activation.

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May 12th, 2009 at 6:29 pm

Database Programming Using VB 6.0 (Part One)

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There are five main methods to connect the database using VB 6.0. VB 6.0 can be connected with all popular relational databases, such as Oracle, Microsoft Access and SQL servers.

  1. Data Control.
  2. ActiveX Data Object (ADO) Control.
  3. Data Environment Designer.
  4. Data Wizard.
  5. Open Database Connectivity (ODBC).

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May 11th, 2009 at 5:42 pm

Menu Programming and Multiple Form Programming Using VB 6.0

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Menu Programming Using VB 6.0

A menu is a collection of commands under a single term, such as File and Edit menus. VB 6.0 allows programmer to develop menus according to the requirements of applications.

These are the steps to develop menus:

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May 10th, 2009 at 4:48 pm

Repetition Programming and Function Procedure Programming Using VB 6.0

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Repetition Programming Using VB 6.0

Repetition programming structure is used to repeat the same piece of code again and again without rewriting it. Repetition structure is also called iterative or looping structure. There are four steps to use loop structure:

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May 9th, 2009 at 8:43 pm

Selection Programming and Sub Procedure Programming Using VB 6.0

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Selection Programming Using VB 6.0

Selection is a method of writing programs to choose between two or among different things, such as to select a job opportunity offer from two different organizations. If-then-else structure is used for selection programming. Relational operators are used for comparison among different things, such as greater than and less than.

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May 8th, 2009 at 4:59 pm

Sequence Programming Using VB 6.0

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Sequence is a method of writing programs in a particular order, such as a driver of a car performs actions in a sequence to drive a car. VB 6.0 supports arithmetic operators like C and C++ programming languages.

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May 7th, 2009 at 10:20 pm