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Kaipara and Waitemata Echo, 28 August 1914, Page 7

Dairy farmers ought always to bear in mind that soil depletion is bound to follow if whole milk is taken from the farm. If the man on the land is a good farmer he will remember this arid provide for it by the purchase of extra fertilisers with which to keep the soil in heart, otherwise he will find that in a few years the producing* power of his land has been greatly decreased. Take a cow giving, say, 5,0001b. of milk. This will mean about 291b. of nitrogen, 9.51b. of phosphoric acid, and B£lb. of potash. The market value of these fertilising elements is about 255., which represents the loss in fertility to the farm per cow for each year. With a herd of twenty cows this would mean a drainage of £25 each year. The growing of peas, clover, and other legumes under proper conditions will, of course, tend to keep up the supply of nitrogen in the soil.