Moderate
The diagnostic techniques used in evaluating soil nutrient status and determining fertilizer requirements of the crop include:
Correct answer: D. All of the above
- A. Nutrient deficiency symptoms & field experimentation
- B. Greenhouse pot experimentation & soil testing
- C. Plant analysis
- D. All of the above
Explanation
Fertilizer recommendations are based on several diagnostic approaches: field symptoms and trials, greenhouse experiments, soil testing and plant analysis. Since every listed method contributes evidence, the inclusive option is appropriate.
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