Soil fertility studies aim to integrate the basic principles of biology, chemistry, and physics,
but generally lead to separate interpretations of soil and plants data [1]. Paradoxically, JB …

The pH of the soil in relation to the availability of plant nutrients has been an important
research topic in soil fertility and plant nutrition. In the 1930 and 1940 s, a diagram was …

Many methods have been developed for assessing the availability of soil nutrients, but for a
variety of reasons none are universally applicable. In this chapter, we discuss the …

Imost all nutrients taken up by plants and microbes are taken up in their ionic form from the
soil solution, and knowledge of the size and composition of the soil solution, together with …

Page 1 FAO SOILS BULLETIN 48 micronutrients and the nutrient status of soils: a global study
FI PANIS FINNIDA FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS …

The use of “balanced” Ca, Mg, and K ratios, as prescribed by the basic cation saturation ratio
(BCSR) concept, is still used by some private soil‐testing laboratories for the interpretation of …

In a previous paper (Part I), the ideal soil fertility and the saturated soil fertility were
expressed on a relative scale, called soil fertility grade (SFG). In the current paper (Part II) …

Agronomic crop production is considered as an extensive system of production in contrast to
horticulture crops which for the most part would be grown more intensively. Soils in varying …

Assessing soil fertility has, as one of its primary goals, the ability to predict nutrient
availability and uptake by a growing crop. It must be understood that there is not always a …

Concepts in soil test interpretation differ greatly. All of them are based on valid principles.
The two concepts most widely used are: sufficiency levels of available nutrients (SLAN) and …