उत्तर प्रदेश में ऊसर मृदा का विस्तार कितने मिलियन हेक्टेयर में हैं ? - How many million hectares are the area of Usar soil in Uttar Pradesh? - Uttar Pradesh Me Oosar Mrida Ka Vistar Kitne Million Hectare Me Hain ? UP GK in hindi, मिट्टी कृषि एवं पशुपालन 0.4 question answers in hindi pdf 1.20 questions in hindi, Know About 0.2 UP GK online test UP GK notes in hindi quiz book 2.40