70552
Other types are possible given reliable irrigation sources and , ideally , water-retentive enriched or alluvial soils , especially wheat ; shallow irrigation sources very widely dry up in and after drought years .
 drought
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 drought