1. A cultivator comprising a framework for towing by a tractor or the like in a forward direction over the ground along crop rows, a first gang of rotary hoes mounted on said framework for rotatably engaging a crop row closely adjacent the crop in the crop row and arranged to swing with respect to said framework about an axis extending normally approximately parallel to the direction of forward movement of said framework and laterally displaced from the first gang of rotary hoes across the crop row, and a second gang of rotary hoes mounted on said framework for rotatably engaging a crop row further away from the crop in the crop row than said first gang and arranged to swing with respect to said framework about an axis extending transverse to the direction of forward movement of said framework.

2. A cultivator comprising a framework for towing along crop rows by a tractor or the like and a plurality of rotary hoe gangs mounted on said framework for rotatably engaging the ground below said framework, the improvement therein of means for independently moving some of said gangs of rotary hoes about axes extending along the crop rows comprising a support leg having mounted thereon at a first one of its ends a gang of rotary hoes normally positioned on one side of a crop row and its other end normally positioned on the other side of the crop row from its gang of rotary hoes and mounted on said framework at its other end and pivotal at its other end about an axis extending generally along the crop row.

3. A cultivator comprising a framework for towing by a tractor or the like in a forward direction over the ground and including a draw bar member normally extending transverse to the forward direction of movement of said framework and a plurality of support bars mounted on said draw bar member and normalLy extending approximately parallel to the forward direction of movement of said framework, a pivotal support leg mounted on some of said support bars and each pivotal support leg extending transverse to the forward direction of movement of said framework and pivotal about an axis approximately parallel to the forward direction of movement of said framework with adjacent ones of the pivotal support legs extending in opposite directions with respect to each other from their respective support bars and in overlapping relationship along the forward direction of movement of said framework, with the overlapping pivotal support legs being offset from each other along the forward direction of movement of said framework, a gang of rotary hoes mounted on at least some of said pivotal support legs for rotatably engaging the ground below said framework as said framework moves in a forward direction over the ground, and a gang of rotary hoes mounted on at least some of the others of said support bars for rotatably engaging the ground below said framework.

5. In a cultivator comprising a framework for towing by a tractor or the like in a forward direction along a plurality of crop rows with a plurality of gangs of rotary hoes mounted on said framework and arranged to rotatably engage the crop rows, the improvement therein of said gangs of rotary hoes being arranged in groups for each crop row, with each group of gangs of rotary hoes comprising a first pair of gangs of rotary hoes with each gang of said first pair being mounted on a pivotal support leg and movable along the length of said pivotal support leg, said pivotal support leg normally extending across a crop row and being arranged to swing about an axis extending approximately parallel to the crop row, and a second pair of gangs of rotary hoes with each gang of said second pair arranged to swing about an axis extending transverse to the crop row.

7. A cultivator comprising a framework for towing along crop rows by a tractor or the like and a plurality of rotary hoe gangs mounted on said framework for rotatably engaging the ground below said framework, the improvement therein of means for independently moving some of said gangs of rotary hoes about axes extending along the crop rows and means for independently moving some of the others of said gangs about axes extending transverse to the crop rows, said means for independently moving some of said gangs of rotary hoes about axes extending along the crop rows comprising for each gang of rotary hoes a support leg connected at a first one of its ends to a gang of rotary hoes and mounted on said framework at its other end and pivotal at its other end about an axis extending generally along the crop row, and said axis normally being positioned on the other side of the crop row from its gang of rotary hoes.

8. A cultivator comprising a framework for towing by a tractor or the like in a forward direction over the ground along crop rows, a first pair of gangs of rotary hoes spaced from each other along the forward direction of movement of said framework and closely spaced from each other across the forward direction of movement of said framework for rotatably engaging opposite sides of a crop row closely adjacent the crop in the crop row, each of said gangs of rotary hoes of said first pair of rotary hoes being mounted on a pivotal support leg and the pivotal support leg normally extending ovEr the crop row from its gang of rotary hoes and pivotally mounted on the other side of the crop row on said framework, and a second pair of gangs of rotary hoes spaced from each other across the forward direction of movement of said framework a distance greater than the spacing of said first pair of gangs of rotary hoes across the direction of movement of said framework for rotatably engaging opposite sides of the crop row further away from the crop in the crop row than said first pair of gangs of rotary hoes.