Unkindness to anything means an injustice to that thing. If I am unkind to you I do you an injustice, or wrong you in some way. On the other hand, if I try to assist you in every way that I can to make a better citizen and in every way to do my very best for you, I am kind to you. The above principles apply with equal force to the soil. The farmer whose soil produces less every year, is unkind to it in some way; that is, he is not doing by it what he should; he is robbing it of some substance it must have, and he becomes, therefore, a soil robber rather than a progressive farmer.