Sentence:  Simultaneously we should be underlining the interrelationships of technical progress in various fields , showing how agricultural training can be introduced into education , how health affects labor <WSD>productivity</WSD> , how small business can benefit the rural farm community , and , above all , how progress in each field relates to national progress . 
Meaning of the word marked with <WSD> tags:  the quality of being productive or having the power to produce