To enhance coordination, the Board, when entering into contracts or agreements for the implementation and carrying out of activities authorized by this chapter, shall ensure that all plans or projects implemented for consumer information, industry information, promotion, or research are each implemented by a single entity. There shall not be in force, at any one time, more than one contract or agreement for implementation of plans or projects for consumer information, for industry information, for promotion, or for research, except that, upon approval of the Secretary, the Board may contract with qualified State soybean boards to implement plans or projects within their respective States.