Origin of plant food
Examples from the Web for plant food
The acid phosphate on the market is rock-phosphate treated with sulphuric acid to render its plant-food available.
The organic sources of fertility, such as slaughter-house refuse, are containers of plant-food as surely as is stable manure.
But let that soil be water-soaked, and have the proper bacteria at work, and the material is in plant-food form.The Library of Work and Play: Gardening and Farming.|Ellen Eddy Shaw
The buyer of a ton of dried blood thus gets about 260 pounds of plant-food.
It excludes the air, sealing up the plant-food so that crops cannot be secured.