Taking a look at what to watch for as teams head into spring practices, officially ringing the bell on preparations for the 2010 season.

Arizona

Spring practice starts: March 5

Spring game: April 10

What to watch:

The new coordinators: The Wildcats lost two outstanding coordinators — Sonny Dykes on offense and Mark Stoops on defense — and decided to replace them with four guys. Tim Kish, promoted from linebackers coach, and Greg Brown, hired away from Colorado, will run the defense, while Bill Bedenbaugh and Seth Littrell, both promoted from within, will run the offense, with an assist from new quarterbacks coach Frank Scelfo. These guys will need to develop a coaching rhythm this spring that will ensure things go smoothly in the fall.

The JC linebackers: The Wildcats must replace three starting linebackers, and JC transfers Derek Earls and Paul Vassallo weren’t brought in to watch. If they step into starting spots, then guys like sophomore Jake Fischer, redshirt freshman Trevor Erno and redshirt freshman Cordarius Golston can fight over the third spot and add depth.

Foles 2.0: Quarterback Nick Foles was dynamic when he was on last year, but the shutout loss in the Holiday Bowl served as a reminder that he’s not there yet. He’s going to be surrounded by a lot of weapons at the skill positions, so he should be able to take another step forward this spring, even with the loss of Dykes.

Arizona State

Spring practice starts: March 30

Spring game: April 24

What to watch:

The QB battle: It’s a wide-open battle between Michigan transfer Steven Threet and Brock Osweiler, though the new guy — Threet — is perhaps the most intriguing. Samson Szakacsy was supposed to join the battle, but his elbow problem is acting up again, coach Dennis Erickson said Thursday. The competition will be overseen by new offensive coordinator Noel Mazzone, who’s been handed an offense that has sputtered the past two seasons.

O-line issues (take 3): The Sun Devils’ offensive line has struggled three years running, and it won’t matter who starts at QB if the unit continues to get pushed around. First off, is health. Will Matt Hustad, Zach Schlink, Garth Gerhart, Mike Marcisz and Adam Tello be ready to battle the entire spring? If so, there should be good competition here, particularly with a couple of JC transfers looking to break through.

The secondary: The Sun Devils were very good against the pass last year, but three starters in the secondary need to be replaced. Both starting corners are gone — though if Omar Bolden successfully returns from a knee injury he should step in on one side — as well as strong safety Ryan McFoy. The good news is a number of guys saw action here last fall, so the rebuilt unit won’t be completely green.

California

Spring practice starts: March 6

Spring game: N/A

What to watch:

Embattled Riley: When things go well, the quarterback often gets too much credit. When things go badly… well, you know. Senior Kevin Riley has started 22 games and has played well at times. But there’s a reason he’s in a quarterback competition for a third consecutive season. Will he be able to hold off a rising Beau Sweeney this spring?

Rebuilding the D: The Bears had questions on defense even before coordinator Bob Gregory unexpectedly bolted for Boise State. Five starters need to be replaced, including mainstays like end Tyson Alualu and cornerback Syd’Quan Thompson, both first-team All-Pac-10 performers. And with Gregory gone, a new — likely more aggressive scheme — now must be incorporated.

RB depth: Shane Vereen is the obvious starter after the departure of Jahvid Best, but Cal has, during the Tedford years, always used two backs. So who’s the No. 2? Sophomore Covaughn DeBoskie was third on the team with 211 yards rushing last year, while promising freshman Dasarte Yarnway redshirted. One or the other will look to create separation.

Oregon

Spring practice starts: March 30

Spring game: May 1

What to watch:

The D-line: The Ducks lost perennially underrated end Will Tukuafu, tackle Blake Ferras and backup Simi Toeaina up front. Considering the plan is to run an eight-deep rotation, there will be plenty of opportunities for players like ends Terrell Turner and Taylor Hart and tackles Anthony Anderson, Zac Clark, Wade Keliikipi as well as 6-foot-7 JC transfer Isaac Remington to work their way into the rotation.

The passing game: The Ducks’ passing game was inconsistent last year, though by season’s end receiver Jeff Maehl was playing at a high level. Refining that part of the offense with quarterback Jeremiah Masoli would make the spread-option even more dangerous. The receiving corps is looking for playmakers, which means youngsters, such as redshirt freshman Diante Jackson, might break through.

Who steps in for Ed Dickson? Oregon only loses one starter on offense, but tight end Ed Dickson is a big one. David Paulson was a capable backup last year, and mercurial Malachi Lewis may be ready to step up. Expect JC transfer Brandon Williams to work his way into the mix.

Oregon State

Spring practice starts: March 29

Spring game: May 1

What to watch:

Katz steps in: Sean Canfield is off to the NFL, so the Beavers’ biggest question this spring is crowning a new starting quarterback. Most observers feel the job is Ryan Katz‘s to lose, and the sophomore looks good throwing the rock around. Still, being a quarterback is about more than a good arm. If he falters, Virginia transfer Peter Lalich might offer an alternative.

Better defensive pressure: The Beavers run a high-pressure defensive scheme, so when the stat sheet says they only recorded 17 sacks in 2009, which ranked ninth in the conference and was 22 fewer than in 2008, you know something is wrong. The entire defensive line is back, so the hope is a year of seasoning, particularly for ends Gabe Miller, Matt LaGrone and Kevin Frahm will mean better production this fall.

The O-line grows up: The Beavers’ offensive line returns four starters from a unit that got better as the year went on. Still, it yielded 29 sacks and the run game struggled at times — Jacquizz Rodgers often had to make yards on his own. Talented left tackle Michael Philipp, who did a solid job as a true freshman starter, should be much improved. A second year playing together with underrated senior center Alex Linnenkohl also should help.

Stanford

Spring practice starts: March 1

Spring game: April 17

What to watch:

Replacing Toby: How do you replace Toby Gerhart and his 1,871 yards and 28 touchdowns? You do not. But the hope is sophomores Tyler Gaffney and Stepfan Taylor and senior Jeremy Stewart will provide a solid answer that keeps the Cardinal’s power-running game churning. It helps to have four starters back from a good offensive line.

Rebuilding the D: If you toss in linebacker Clinton Snyder and end Erik Lorig, Stanford must replace six defensive starters from a unit that ranked near the bottom of the conference in 2009. The secondary is a particular concern after giving up 23 touchdown passes and a 63 percent completion rate. The hope is good recruiting from coach Jim Harbaugh will provide better athleticism in the back-half. Another issue: There was huge coaching turnover, particularly on defense during the offseason, so new coordinator Vic Fangio & Co. will be implementing new schemes and learning about what sort of talent they have to work with.

Luck steps up: This was Gerhart’s team in 2009. Now it’s Luck’s. He might be the most talented QB in the conference. Heck, he might become a Heisman Trophy candidate before he’s done. But life won’t be as easy without defenses crowding the line of scrimmage because they are fretting about Gerhart. Luck will need to step up his game — and leadership — to meet the challenge.

UCLA

Spring practice starts: April 1

Spring game: April 24

What to watch:

Prince becomes king? The fact that offensive coordinator Norm Chow has been such an advocate for sophomore quarterback Kevin Prince should tell you something: He’s got the ability. Prince flashed some skills during an injury-plagued 2009 season, and it’s important to remember he was a redshirt freshman playing with an questionable supporting cast, particularly the O-line. Prince needs to improve his decision-making, and the passing game needs to develop a big-play capability that stretches defenses.

Front seven rebuilding: UCLA not only must replace six starters on defense, it must replace six guys everyone in the Pac-10 has heard of. And five of the lost starters come from the front seven, and the guys who were listed as backups on the 2009 depth chart won’t necessarily inspire confidence. In other words, the Bruins will try to take a step forward in the conference with what figures to be an extremely green defense, particularly up front.

The running game? Know what would help Prince and a young defense? A better running game. The Bruins were significantly better in 2009 than in 2008, but that merely means one of the worst rushing attacks in the nation moved up to ninth in the conference. There’s a logjam of options at running back — with a couple of dynamic runners in the incoming recruiting class — and the offensive line welcomes back a wealth of experience. It would mean a lot if the Bruins could boost their rushing total to around 150 yards per game (from 114.6 in 2009).

USC

Spring practice starts: April 31

Spring game: TBA

What to watch:

Welcome, Lane Kiffin: The Pete Carroll era is over. Enter Lane Kiffin & Co. In terms of scheme, things will be fairly consistent, seeing that Kiffin was formerly Carroll’s offensive coordinator and Monte Kiffin was Carroll’s defensive mentor. But there will be a period of adjustment. The guess is the hyper-intense Ed Orgeron might provide a bit of a shock to the D-linemen.

Barkley Year 2: Barkley won’t have the president of his fan club — Carroll — around anymore. He’s a true talent. Everyone knows that, even without Carroll’s daily sonnets about his ability. But the numbers show he threw 14 interceptions in 12 games vs. 15 TD passes last year, so he’s obviously not arrived. Kiffin runs the offense, so you can expect these two to work closely together. Barkley will have plenty of help on offense, but the talent won’t be as good as it was in 2009, with six starters needing to be replaced, including his top two targets (receiver Damian Williams and tight end Anthony McCoy).

Secondary questions: All four starters from the defensive backfield are gone, including center fielder Taylor Mays. It helps that cornerback Shareece Wright, an academic casualty in 2009, will be back. He was a projected starter last fall. There’s plenty of talent on hand, but last year’s team proved that the Trojans don’t always just plug-and-play.

Washington

Spring practice starts: March 30

Spring game: April 30

What to watch:

Unleashing Locker: The return of quarterback Jake Locker was the best news any Pac-10 team received this offseason. Locker’s passing improved dramatically in just one year under coach Steve Sarkisian, so it’s not unreasonable to expect him to be even better in 2010, particularly with nine starters back on offense and just about every skill player on the depth chart.

Replacing Te’o-Nesheim: Daniel Te’o-Nesheim was a four-year starter who blossomed into an All-Pac-10 performer despite almost no supporting cast. He led the Huskies with 11 sacks in 2009, which was 8.5 more than any other player. Also, opposite end Darrion Jones is gone, and the cast at the position is extremely young. Who’s the next pass-rushing threat?

The Butler did it: Linebacker Donald Butler blossomed last year, earning second-team All-Pac-10 honors and leading the Huskies in tackles and tackles for loss (15.5). Toss in E.J. Savannah’s failure to earn a sixth year of eligibility from the NCAA, and the Huskies have some questions at linebacker. Mason Foster is a sure thing at one outside position, and Cort Dennison likely will fill a second gap, but there’s an opportunity for a young player to fill void No. 3.

Washington State

Spring practice starts: March 25

Spring game: April 24

What to watch:

Tuel time: Coach Paul Wulff decided that freshman Jeff Tuel was the Cougars’ quarterback of the future last year, so he opted to start him instead of going with a redshirt season. Tuel showed promise in six games, completing 59 percent of his passes with six touchdowns and five picks. Most of his supporting cast is back on offense, so the expectation is the Cougars’ offense could take a significant step forward this fall.

O-line intrigue: Some of the Cougars starting on the offensive line last fall didn’t look like Pac-10 players. Injuries and youth made the line a glaring area of weakness, even with veteran Kenny Alfred at center. Alfred is gone, but the expectations are that last year’s youth will be saltier after taking their knocks. Plus, a couple of juco additions should be in the mix for starting jobs.

Growing up: There is hope in that 19 starters are back from a team that played a lot of underclassmen in 2009. That youth should mature in 2010. And solid recruiting classes the past two seasons should offer an infusion of young promise.