In the context of agriculture, what does soil testing primarily involve?

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Analyzing soil samples in a lab to determine nutrient availability for plantsGathering samples of only plant leaves for evaluationEvaluating soil for salt concentration and toxic elementsBoth analyzing nutrient status and checking for salinity and toxicity in soilNone of the above

Explanation

Soil testing encompasses both the laboratory analysis of soil to determine the nutrients accessible to plants and the assessment of soil salinity and potential toxic elements. Therefore, the correct understanding includes both aspects represented in option D.