Abstract
Field experiment was conducted during the spring season of 2008 in the fields of Mosul Technical Institute Cotton research unit to study the in pact of spraying boron in different concentrations (0, 10, 20, 30, 40 mg. g-1) on three varieties of cotton plant (Ashore, Lashata & cooker 310) for cotton yield addition components of spraying boron was applied in three times: first spray was stated with the stage of vegetative growth after 45 from planting, where the second applied with the stage of vegetative and flowering buds after 75 from planting, and the third spray after two weeks from the second spray.
The result of the study showed that the Lashata variety was significantly dominated the other studied. Varieties in terms of plant height, number of vegetative and fruiting branches, number of open bolls and technological changes varieties which are: boll weight, seeds index, lint index, hair weight and total cotton yield: 107.1 cm., 18.46, 4.64, 41.9, 4.54 gm., 8.08, 5.78, 622.1 kg/ d. and 4.53 ton/ h. respectively. The responses was obvious in high concentration of boron used for the three studied varieties .
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