The author recommends all who use the book to perform the experiments and to make the observations, and so come actively in touch with the work.
The observations begin on the farm. The author considers the plant the central and all-important factor or agent on the farm.
The root is regarded as the most important part of the plant to itself, and consequently to the plant grower.
The general truths or principles which state the conditions necessary for the growth and development of plant roots are regarded as the foundation truths or fundamental principles of all agriculture. These truths are as follows:
The roots of farm plants need for their best growth and development:
- A firm, mellow soil.
- A moist soil.
- A ventilated soil.
- A warm soil.
- A soil supplied with plant food.
The first two chapters lead the reader quickly through logical reasoning to these fundamental truths, on which the remainder of the work is based.
A study of soils is made in connection with the root studies, as the two are so closely related.
After the study of roots and soils the other parts of the plant are considered in the order of their importance to the farmer or plant grower. The aim is always to get at fundamental facts and principles underlying all agricultural and horticultural practice.
The author regards the conditions necessary to root growth and development as the important factor constituting soil fertility, and in the last ten chapters takes up the discussion of certain farm operations and practices and their effects on these necessary conditions, and consequently their effect on the fertility of the soil.