It is important that bassoon students learn to balance air and embouchure pressure to be able to play in tune. If you find that a student is consistently sharp in pitch, that student is probably blowing too hard, pinching the embouchure, or a combination of both. The various scale notes within the bassoon range require different balances of air and embouchure pressure. Another consideration regarding bassoon intonation is tone quality. As with most instruments, trumpets have certain notes that will sound out of tune if no adjustment is made by the player.
Proper intonation is dependent on great air support.
Have students practice high notes using the strobe tuner. This helps them realize how to properly play those notes and also trains their ears on how to analyze their pitch. Eventually they will learn to make the necessary adjustments to play the full range of notes in tune. Fatigue is also a consideration. As students become fatigued they often use too much mouthpiece pressure.