Economical optimum dose of phosphorus for mungbean (Vigna radiata) under contrasting tillage practices in arid region oleh RAZ MOHAMMAD STORI, C M PARIHAR, SADEQULLAH AHMADI, KHAL MOHAMMAD AHMADZAI, H S NAYAK, S L JAT, B N MANDAL, MOHAMMAD KHAN WASIFHY, SAYED AHMAD SAYEDI, ABDUL BARI SHAMSI, QUDRATULLAH EHSAN, M D PARIHAR, LALIT KUMAR, B R MEENA