Question

The terms "Leaf Area Index (LAI)" and "Crop Growth Rate (CGR)" were coined by :

• A. William
• B. DJ Watson
• C. West, Briggs & Kidd
• D. Nichiporovich

Hint:

D. J. Watson = LAI and CGR.
West, Briggs & Kidd = RGR (Relative Growth Rate).
Gregory = NAR (Net Assimilation Rate).
These names are cornerstones of plant growth analysis.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
This question is about the history of crop physiology and the development of growth analysis parameters used to quantify crop performance.
Detailed Explanation:

• Growth Analysis Parameters:
Physiologists needed mathematical ways to describe how a crop grows over time relative to its light-intercepting surface.

• Leaf Area Index (LAI):
LAI is defined as the total one-sided green leaf area per unit ground surface area. It is a dimensionless quantity.
The term was coined by D. J. Watson in 1947. He recognized that the leaf area per unit of land was a more useful measure of a crop's photosynthetic capacity than just the size of individual leaves.

• Crop Growth Rate (CGR):
CGR is the rate of dry matter accumulation per unit of ground area per unit of time ($g/m^2/day$).
Watson also played a primary role in defining and popularizing this term for agricultural research.

• Other Contributions:
West, Briggs, and Kidd (1920): They developed the concept of Relative Growth Rate (RGR).
Nichiporovich: A Soviet scientist known for his work on the photosynthetic potential and "ideal" plant types.

Step 2: Final Answer:
The fundamental growth indices LAI and CGR were coined and developed by D. J. Watson.