sql query

Question

i have created a table.

CREATE TABLE [dbo].[tbl_Employee](
    [empid] [int] IDENTITY(1,1) NOT NULL,
    [name] [varchar](100) NULL,
    [salary] [int] NULL
)

its workin fine, now i want that if i do not insert salary column then it does not enter null, it add any value like 1000


how can i do it?