Yellow leaves on Bradford pear trees in spring could be a sign of over-watering (whether by nature or by you) and/or poor drainage. If you have clay soil you may need to improve the drainage and/or aerate the soil. If the specimen sits in a low spot, you may need to improve the drainage.
To aerate clay soil, I have heard of puncturing the ground with an auger. To improve drainage, you could dig channels to facilitate run-off. The latter, of course, is more feasible in a mulched area than in a lawn area (but hopefully it’s just a case where you’ve over-watered the plant and simply need to stop watering so much).
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