(第7號)臺灣省土壤肥力概述

Abstract

Soil productivity is the capacity of the soil to grow plants. It is controled not only, by the properties of the soil itself but also by the climatic and biotic conditions under which the soil exists. Soil fertility has a more limited meaning. It concerns primarily with the soil factors, of which the texture, the organic-matter content the pH value, the nitrogen, the available phosphorus and the available potash are perhaps the most important ones. Although these six factors are not the sufficient conditions in predicting the productivity or in diagnosis of the nutrient deficiency of the soil, yet they are the necessary ones.