Q.36
Diagnosis and recommendation integrated system (DRIS) approach was developed by:
EXPLANATION
Micronutrient Chemistry (Fe, Mn, Zn, Cu, B, Mo): Ionic Strength, Availability Indices & Chelation Equilibria
- DRIS (Diagnosis and Recommendation Integrated System): Developed by E.R. Beaufils in 1973 for sugarcane and later calibrated across various field and orchard crops.
- Methodology: Evaluates plant nutritional status by comparing nutrient elemental ratios (e.g., N/P, N/K, P/K) with calibrated standard norms derived from high-yielding populations, minimizing dilution and concentration effects caused by plant age or dry matter accumulation. (Correct answer: Option 3)
- Olsen: Developed the sodium bicarbonate method for available phosphorus extraction in alkaline soils.
- Liebig: Formulated the Law of the Minimum (1840).
- Arnon: Formulated the Criteria of Essentiality of plant nutrients with Stout (1939).
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