The amount of manure produced must be considered in planning a cropping system for a farm. If one wishes to manure one-fifth of the land every year with 10 tons per acre, there would have to be provided two tons per year for each acre of the farm. This would require about one cow or horse, or equivalent, for each six acres of land.

Naturally there is great variation in manure according to the animals it is made by, the feeding and bedding material, and the manner in which it is kept. Different analyses naturally shows different results and the tables here given serve only as a guide or index to the various kinds. The manure heap, by the way, is no place for old tin cans, bottles, glass, and other similar waste material.

I understand the necessity of manure management and don’t mean to make light of such an important environmental concern, but let us not forget to use common sense. The main problem is animal numbers. The more animals confined in a given area, the bigger the problem with waste disposal. It is a sad state of affairs in today’s agriculture when a once valuable commodity, becomes an undesirable by-product.

In addition to nitrogen, phosphoric acid, and potash, manure contains considerable calcium and smaller amounts of minor elements. The amounts vary with kind of animal, composition of feed, age of animal, milk production, and individuality of the animal. For example, about two-thirds of the nitrogen and one-half of the phosphorus carried in the ration of a well-fed, heavy-producing dairy cow is excreted in manure. A well-fed two-year-old steer excretes almost 90 per cent of the nitrogen and phosphorus consumed. The organic matter and bacteria contained contribute benefits beyond those of the plant food.

Every farmer knows that when a crop is grown on the same field year after year, it becomes inferior in quality and the yield steadily diminishes.