. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. MONTANA 1365 The food elements removed by bearing apple trees during a period of 20 years have been estimated to be: Phosphoric Nitrogen Acid Potash Apples Leaves 126. 441. Trees Total 1, 1, If trees were able to remove all the plant food elements from the soil (which they ar
. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. MONTANA 1365 The food elements removed by bearing apple trees during a period of 20 years have been estimated to be: Phosphoric Nitrogen Acid Potash Apples Leaves 126. 441. Trees Total 1, 1, If trees were able to remove all the plant food elements from the soil (which they are not) there would be enough ni- trogen, in the soil analyzed, to last a fruit crop 30 years; enough phosphoric acid to last 150 years and enough potash to last about 160 years. The above analysis was from the top eight inches of soil, and since fruit trees gather food to a much greater depth, it is evident that there would be much more of the plant food elements per acre than is indicated above. However, plants cannot take all the ele- ments from the soil for many reasons, chief among which is the fact that a large portion of the elements in a soil are una- vailable for plant use until made so by proper tillage, application of humus and other means. On the sage-brush benches of the east side there is but little humus in the soil, and through continuous clean cultivation what humus there is is soon worn out and the soils become hard and compact and a poor place to grow profitable crops of fruit. Within the past few years much thought and study has been given to the subject of getting humus into the soil in order that the plant foods therein may be made available, to loosen the soil and put it into condition to take up and re- tain moisture, and to make it possible for the soil bacteria to work, which is very essential to the best growth of plants. The application of barnyard manure would accomplish these things, but in the large acreage planted to trees this is im- possible to
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