G. F. Hauser

- iii - Foreword The rationalization of fertilizer use in the developing world is quickly gaining importance. The general fertilizer recoiranendations which have been developed during the last two decades for large agricultural areas throughout the world were based on thousands of small...

lUTROroPTION During the last tvo deoades PAO has assisted memter oouptriea in oarrying out large soalo soil fertility surveys with the purpose of increasing agricultural production quickly by the introduction or expansion of the use of mineral fertilizers. The first step in such operations is to...