ರಸಗೊಬ್ಬರಗಳಲ್ಲಿನ ಕ್ರಾಂತಿಯೊಂದಿಗೆ ಯಾವ ಬಣ್ಣವು ಸಂಬಂಧಿಸಿದೆ?

The Grey Revolution refers to increased production of fertilisers (and wool). Pink is meat and onion, Golden is horticulture and honey, Black is petroleum.