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Magazine Reference: Nitrification

Nitrification:

The process resulting in the formation of nitrates in the soil. Certain bacteria known as "nitrifying bacteria" are the cause of this change of nitrogen and nitrogen compounds into nitrates. It is thus the oxidation of nitrogen caused by bacteria in the soil. Nitrification cannot proceed except in a moist, warm soil which is well aerated. It is checked entirely when the soil temperature is lower than 40° F. and also when the soil becomes water logged or saturated, and proceeds rapidly when the temperature reaches 75° Fahr. and when only 40 to 50 per cent. of the water necessary to cause saturation is present. Nursery:

A place for growing plants out-of-doors, usually under intensive cultivation. Nursery-grown Stock:

Plants which have been grown at least one full year in a nursery, under the supervision of competent gardeners or nurserymen so as to produce a number of even-sized superior plants for transplanting. Open Allee:

A way framed on either side by symmetrical rows of closely planted trees or tall shrubs (of a height not less than twice the width between rows), and so maintained that both sides present a continuous vertical wall of close-growing foliage.

Opening-up:

In discussions on pruning this term means the cutting out of sufficient growth to admit the sunshine to the centre of the plant or to the area about a group of plants.