Modern Agriculture has become an increasingly technical field in which an instructor is inevitably pressed to explain terms or processes which are themselves sophisticated and technical. Two such problematical areas are expressions of toxicity, such as LD LC KD etc., and the means of diluting concentrated solutions. Both concepts are of relevance to agricultural education whether the student wishes to pursue basic experiments in a laboratory or apply the principles to tank mixtures in a field setting. The teaching of these ideas, however, is fraught with much confusion as a result of the multiplicity of seemingly interchangeable terms as well as the lack of standardized methodologies for carrying out related procedures. The confusion can be eliminated if the instructor reduces expressions of toxicity and the calculation of dilution factors to derivatives of simple formulae.



toxicity, dilution factors, simple formulae

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