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A soil aeration apparatus can include an aeration rotor comprising at least one set of aeration tines configured for movement in a planetary motion about an axis. The apparatus can further include the aeration rotor being configured to remove soil plugs from a ground surface and break the soil plugs

A soil aeration apparatus can include an aeration rotor comprising at least one set of aeration tines configured for movement in a planetary motion about an axis. The apparatus can further include the aeration rotor being configured to remove soil plugs from a ground surface and break the soil plugs into soil particles when the aeration rotor is rotated.

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1. A soil aeration apparatus comprising: an aeration rotor comprising a carrier and a plurality of aeration tines supported by the carrier, wherein the rotor is configured to drive the aeration tines to penetrate soil and remove soil plugs from the soil when the aeration rotor is rotated; and a shie

1. A soil aeration apparatus comprising: an aeration rotor comprising a carrier and a plurality of aeration tines supported by the carrier, wherein the rotor is configured to drive the aeration tines to penetrate soil and remove soil plugs from the soil when the aeration rotor is rotated; and a shield defining a rotor cavity and at least partially surrounding the aeration rotor positioned in the rotor cavity, wherein the shield defines at least one tine port sized and positioned to allow for ingress and egress of the aeration tines during rotation of the rotor, and wherein the shield defines a plurality of sifting ports sized small enough to contain soil plugs within the rotor cavity and large enough to allow soil particles from broken soil plugs to pass through the sifting ports out of the rotor cavity, wherein the shield defines a second tine port sized and positioned to allow for ingress and egress of the aeration tines during rotation of the rotor, wherein the aeration tines extend out of the shield only at the first and second tine ports during rotation of the rotor. 2. The soil aeration apparatus of claim 1, wherein the aeration rotor comprises: first and second carriers rotatable about a first axis;a first tine-holder shaft extending between the first and second carriers, the first tine-holder shaft supporting a first set of aeration tines, wherein the first tine-holder shaft is rotatable with respect to the first carrier about a second axis; anda second tine-holder shaft extending between the first and second carriers, the second tine-holder shaft supporting a second set of aeration tines, wherein the second tine-holder shaft is rotatable with respect to the first carrier about a third axis. 3. The soil aeration apparatus of claim 2, wherein rotation of the first and second tine-holder shafts turns the first and second sets of aeration tines to sweep through the first axis. 4. The soil aeration apparatus of claim 2, wherein the aeration rotor rotates in a first direction and the first and second tine-holder shafts rotate in a second direction during rotation of the aeration rotor in the first direction. 5. The soil aeration apparatus of claim 2, wherein the aeration rotor has a radius extending from the first axis to each of the second and third axes of about 3.5 inches. 6. The soil aeration apparatus of claim 2, wherein the aeration rotor has a radius extending from the first axis to each of the second and third axes of between about 3 inches to about 4 inches. 7. The soil aeration apparatus of claim 2, wherein the aeration rotor has a radius extending from the first axis to each of the second and third axes of between about 2 inches to about 6 inches. 8. The soil aeration apparatus of claim 7, wherein at least some of the plurality of aeration tines have a length exceeding the radius. 9. The soil aeration apparatus of claim 1, wherein the aeration rotor comprises a pulverizing bar configured for pulverizing soil plugs into soil particles in the rotor cavity. 10. The soil aeration apparatus of claim 9, wherein the pulverizing bar is positioned between about 0.05 inch and about 0.2 inch from an inner surface of the shield. 11. The soil aeration apparatus of claim 1, wherein each of the aeration tines comprises a knife and a tube connected to the knife, wherein the aeration rotor and aeration tines are configured to pull soil plugs from a ground surface and fling the soil plugs into the rotor cavity to be pulverized into soil particles by the aeration rotor within the rotor cavity. 12. The soil aeration apparatus of claim 1, and further comprising: a motor operably connected to the aeration rotor to drive rotation of the aeration rotor; anda relief spring system connected between the motor and the aeration rotor and configured to allow for some rotation by the motor when rotation of the aeration tines is temporarily slowed or stopped. 13. The soil aeration apparatus of claim 12, wherein spring capacity of the relief spring system is equal to or greater than weight of the soil aeration apparatus. 14. The soil aeration apparatus of claim 13, wherein the spring capacity of the relief spring system is between about 150 pounds and about 600 pounds and the soil aeration apparatus weighs between about 100 pounds and about 500 pounds. 15. A soil aeration apparatus comprising: an aeration rotor comprising a carrier and a plurality of aeration tines supported by the carrier, wherein the rotor is configured to drive the aeration tines to penetrate soil and remove soil plugs from the soil when the aeration rotor is rotated; and a shield defining a rotor cavity and at least partially surrounding the aeration rotor positioned in the rotor cavity, wherein the shield defines at least one tine port sized and positioned to allow for ingress and egress of the aeration tines during rotation of the rotor, and wherein the shield defines a plurality of sifting ports sized small enough to contain soil plugs within the rotor cavity and large enough to allow soil particles from broken soil plugs to pass through the sifting ports out of the rotor cavity, wherein the shield comprises a front shield positioned forward of the aeration rotor and a rear shield positioned behind the aeration rotor, wherein each of the front and rear shields define a plurality of the sifting ports sized small enough to contain soil plugs within the rotor cavity and large enough to allow soil particles from broken soil plugs to pass through the sifting ports out of the rotor cavity. 16. The soil aeration apparatus of claim 15, and further comprising: a frame connected to at least two wheels for travelling over a ground surface, the frame supporting the rotor and having a handle positioned and configured to facilitate a user to push the soil aeration apparatus. 17. The soil aeration apparatus of claim 16, and further comprising: a motor supported by the frame and operably connected to the aeration rotor to drive rotation of the aeration rotor such that the aeration tines can penetrate and exit the ground when the aeration rotor is rotated. 18. The soil aeration apparatus of claim 17, and further comprising: a relief spring system connected between the motor and the aeration rotor and configured to allow for some rotation by the motor when rotation of the aeration tines is temporarily slowed or stopped. 19. The soil aeration apparatus of claim 18, wherein spring capacity of the relief spring system is equal to or greater than weight of the soil aeration apparatus. 20. A method of operating the soil aeration apparatus of claim 15, the method comprising: moving a set of the plurality of aeration tines in a planetary motion such that the set of aeration tines revolve about a first axis and rotate about a second axis different than the first axis;removing soil plugs from a ground surface via the aeration tines;breaking the soil plugs into soil particles via components of the soil aeration apparatus; andreturning the soil particles to the ground surface. 21. The method of claim 20, the method further comprising: flinging the soil plugs from the aeration tines into the rotor cavity, wherein the soil plugs are broken into soil particles in the rotor cavity. 22. The method of claim 20, the method further comprising: passing the soil particles through the sifting ports. 23. The method of claim 20, the method further comprising: walking behind the soil aeration apparatus and holding a handle of the soil aeration apparatus while operating the soil aeration apparatus to remove and break soil plugs. 24. The soil aeration apparatus of claim 15, wherein the aeration rotor comprises: first and second carriers rotatable about a first axis;a first tine-holder shaft extending between the first and second carriers, the first tine-holder shaft supporting a first set of aeration tines, wherein the first tine-holder shaft is rotatable with respect to the first carrier about a second axis; anda second tine-holder shaft extending between the first and second carriers, the second tine-holder shaft supporting a second set of aeration tines, wherein the second tine-holder shaft is rotatable with respect to the first carrier about a third axis. 25. The soil aeration apparatus of claim 24, wherein the aeration rotor has a radius extending from the first axis to each of the second and third axes of about 3.5 inches. 26. The soil aeration apparatus of claim 24, wherein the aeration rotor has a radius extending from the first axis to each of the second and third axes of between about 2 inches to about 6 inches. 27. The soil aeration apparatus of claim 15, wherein the shield defines a second tine port sized and positioned to allow for ingress and egress of the aeration tines during rotation of the rotor, wherein the aeration tines extend out of the shield only at the first and second tine ports during rotation of the rotor. 28. The soil aeration apparatus of claim 15, wherein the aeration rotor comprises a pulverizing bar configured for pulverizing soil plugs into soil particles in the rotor cavity and wherein the pulverizing bar is positioned between about 0.05 inch and about 0.2 inch from an inner surface of the shield.