Question

LER stands for

• A. Land Equivalent Ratio
• B. Land Equality Ratio
• C. Larval escape rate
• D. Larval equity rate

Hint:

An LER value greater than 1 indicates a yield advantage. This index is a key metric in agronomy and integrated pest management to assess the benefits of polyculture and mixed cropping.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Intercropping is the agricultural practice of cultivating two or more crop species simultaneously in the same field.
To evaluate the productivity and efficiency of an intercropping system compared to growing each crop on its own, agronomists use standardized quantitative metrics.

Step 2: Detailed Explanation:
The standard abbreviation "LER" stands for Land Equivalent Ratio.
LER is defined as the relative land area required under sole cropping to produce the same yields achieved in an intercropping system.
The mathematical formula used to calculate LER is:
\[ \text{LER} = \sum \left( \frac{Y_{I, i}}{Y_{S, i}} \right) \]
where \( Y_{I, i} \) is the yield of crop \( i \) in the intercrop system, and \( Y_{S, i} \) is the yield of crop \( i \) grown as a sole crop.
Let us interpret the LER value:
- If \( \text{LER} > 1.0 \): The intercropping system is more efficient than sole cropping. For example, an LER of 1.25 means that a sole crop would require 25% more land to match the yield of the intercrop system.
- If \( \text{LER} = 1.0 \): There is no yield advantage to intercropping.
- If \( \text{LER} < 1.0 \): Intercropping reduces overall yield efficiency, likely due to excessive competition between the crop species.
The other options listed (Land Equality Ratio, Larval escape rate, Larval equity rate) are incorrect terms.

Step 3: Final Answer:
LER stands for Land Equivalent Ratio.
Thus, the correct option is (A).