. Better fruit. Fruit-culture. igii BETTER FRUIT Page 49. The ])are patches show where the plants have been killed out during the winter The Cowpea as an Orchard Cover Crop discuss the principles of feeding plants. It is enough to say that in general plants require three elements of plant food, and the apple tree is no excep- tion. These elements are nitrogen, pot- ash and phosphoric acid. While not usually considered a necessary element of plant food, which must be supplied, lime is of much benefit to most crops, and its value should be considered when buying fertilizers. If these ele- ments
. Better fruit. Fruit-culture. igii BETTER FRUIT Page 49. The ])are patches show where the plants have been killed out during the winter The Cowpea as an Orchard Cover Crop discuss the principles of feeding plants. It is enough to say that in general plants require three elements of plant food, and the apple tree is no excep- tion. These elements are nitrogen, pot- ash and phosphoric acid. While not usually considered a necessary element of plant food, which must be supplied, lime is of much benefit to most crops, and its value should be considered when buying fertilizers. If these ele- ments are not in the soil in available form they must be applied. It is not only necessary that they be present in the soil, but they must be in a soluble form, for in such form only can plants make use of them. Some kinds of fer- tilizers dissolve readily when applied to the soil. There are other kinds that become available gradually and some others that are so nearly insoluble that most plants cannot make use of them. The apple, being a long lived crop, can make use of the slow working fer- tilizers, but the tendency among care- ful apple growers is to use soluble fer- tilizers and apply them just when needed. The experienced apple grower who keeps a close watch of his trees will probably get best results from soluble fertilizers, but the average farmer will do well to adhere to the use of fertilizers that become available gradually. The various kinds of com- mercial fertilizers contain one or more elements of plant food in varying pro- portion. With our present system of fertilizer inspection the percentage composition as given by the dealer may be depended upon. In figuring the relative value of different kinds or brands of fertilizers it is always nec- essary to know the percentage of plant food that the sample in question con- tains. Farmers are inclined to buy low priced fertilizers, while in many cases, especially when they are to be shipped long distances, the higher priced
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