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The most rational view is that in order to bear regularly the tree must be prevented from overbearing by thinning of the fruit; also that the moisture and plant-food supply must be regularly maintained, so that the tree may work along regularly and not stop bearing one year in order to accumulate vigor for a following year's crop.
The agricultural chemist and the microbiologist of the latter end of the nineteenth century have laid considerable stress upon the prospects of using the minute organisms which attach themselves to the roots of some plants particularly those of the leguminaceæ as the means of fixing the nitrogen of the atmosphere, and rendering it available for the plant-food of cereals which are not endowed with the faculty of encouraging those bacteria which fix nitrogen.
Lenotre had hastened the pleasure of the Maecenas of his period; all the nursery-grounds had furnished trees whose growth had been accelerated by careful culture and the richest plant-food. Every tree in the neighborhood which presented a fair appearance of beauty or stature had been taken up by its roots and transplanted to the park.
If the vetch is to be fed green, rye is a good grain, but not good for hay purposes because of the hardness of the stem. There is no particular difference in the plant-food requirements of the different grains, so that there is nothing gained in that way in the choice of wheat.
We obtain the energy we need for living from the solar energy stored in the plant-food we eat or in the flesh of the animals that eat the plants. The energy we obtain from coal or oil is solar energy trapped by the chlorophyll in plant life millions of years ago. We live by the sun through the agency of chlorophyll."
The two gods of plant-food hid in the Earth, and she, forgiving mother that she was, sheltered them in her breast. Only Tu, the god of mankind, stayed erect and undaunted. So it is that the winds and storms make war to this day upon men, wrecking their canoes, tearing down their houses and fences and ruining all their handiwork.
The feasibility of the electrical mode of fixing atmospheric nitrogen for plant-food has been demonstrated by eminent electricians, the famous Hungarian inventor, Nikola Tesla, being among the foremost.
A plow cuts through the soil as the horses pull it after them, and it is so shaped that the upper part of the earth is turned over, bringing up to the top, where the sun can shine on it, the underneath part. The undersoil is richer and better for seeds to start growing in than the upper part, where the rain may wash away the plant-food things that are needed to make a good garden.
No matter how abundantly the ground may be enriched at first, time and chemical action are required to transmute the fertilizers into the best forms of plant-food, and make them a part of the very soil itself.
So the man of science studies the soil and finds out what plant-food it contains, how the water acts in it, what heat and air do, and the inter-relation of all these elements. He studies the plant and its habits and tries to discover how it grows and how it can be improved for man's use.
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