blocked queries in sql server

SELECT session_id, command, blocking_session_id, wait_type, wait_time, wait_resource, t.TEXT
FROM sys.dm_exec_requests
CROSS apply sys.dm_exec_sql_text(sql_handle) AS t
WHERE session_id > 50
AND blocking_session_id > 0
UNION
SELECT session_id, '', '', '', '', '', t.TEXT
FROM sys.dm_exec_connections
CROSS apply sys.dm_exec_sql_text(most_recent_sql_handle) AS t
WHERE session_id IN (SELECT blocking_session_id
                    FROM sys.dm_exec_requests
                    WHERE blocking_session_id > 0)