Requirements for plant growth. Nitrogenous fertilizer materials. Phosphatic fertilizer materials. Potash fertilizer materials. Effects of fertilizers on crops and soils. Factory-mixed fertilizers. Home-mixing of fertilizers. Purchase and use of fertilizer. Liming in relations to fertilizer practice. Organic matter in relation to fertilizer practice and use.

The burgeoning demand on the world food supply, coupled with concern over the use of chemical fertilizers, has led to an accelerated interest in the practice of precision agriculture. This practice involves the careful control and monitoring of plant nutrition to maximize the rate of growth and yield of crops, as well as their nutritional value.