Step 1: About ICAR-CISH.
The ICAR-Central Institute of Subtropical Horticulture (CISH) was established to conduct advanced research in subtropical fruits.
It mainly focuses on crops like mango, guava, papaya, litchi, aonla, and other subtropical horticultural crops.
Step 2: Location.
ICAR-CISH is located in **Lucknow, Uttar Pradesh**.
It has two campuses – one at Rehmankhera and another at Malihabad.
Step 3: Analysis of options.
- (1) Srinagar: Known for temperate horticulture institutes, not subtropical.
- (2) Bikaner: Arid zone research institutes are located here.
- (3) Ludhiana: Focuses on agricultural research in Punjab, not subtropical fruits.
- (4) Lucknow: Correct, the main center for subtropical horticulture research.
Step 4: Conclusion.
Thus, ICAR-CISH is located at **Lucknow**.