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Both sulphur (S) and boron (B) are essential plant nutrients. Sulphur is a macro-nutrient of which roughly about 30 kg/ha is utilized by orchards, while B is a micro-nutrient and only about 120 g/ha is annually taken up by trees. For inexplicable reasons, many producers...

  In the light of decreasing availability of water for irrigation, producers are compelled to investigate the possibility of using water sources previously not considered, i.e., boreholes or wastewater. The quality of these sources often raises concern, making producers unsure whether they can rely on them...

Introduction In circa 1500 Leonardo da Vinci said: ”We know more about the movement of celestial bodies than about the soil underfoot”. Although our knowledge of both these fields of science has developed immensely over the last five centuries, this statement undoubtedly remains true. Soil life,...

In hierdie skrywe deel ons graag wat in ‘n onlangse verslag van die Bemestingstofvereniging van Suid-Afrika (FERTASA) gepubliseer is met julle.  Produsente is soms besorg oor die kwaliteit van hul kunsmis, te wete of dit werklik die verklaarde hoeveelheid N, P, K, Ca, Mg en...

As guidelines upon which soil analyses are interpreted and fertilisation is applied, the basic cation saturation ratio (BCSR) concept (now better known as the Albrecht system) has become popular amongst various plant nutritionists.  It is based on a presupposition that plants will only grow optimally...

by Bennie Diedericks In the world of soil science, all particles of 2mm and larger, are regarded as course fragments or stones. In a soil analysis report the amount of stones in a soil is expressed on a volume basis, e.g., 30% of the soil...

The cation exchange capacity (CEC) is a property of a soil that describes its capacity to adsorb plant nutrient cations (positively charged atoms or molecules such as Ca2+, Mg2+, H+ and K+).     Soil clay minerals and organic matter tend to be negatively charged, thus attracting the...