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A field experiment aimed at optimizing fertilizer use in different crop sequences, was conducted during 1991-92 and 1992-93 at Mandor (Jodhpur). Double-crop sequences recorded higher annual productivity and net return over monocrops. Pearlmillet [Pennisetum glaucum (L.) R. Sr. emend. Stuntz.]-cumin (Cuminum cyminum L.) was found more remunerative but less sustainable compared with pearlmillet-Indian mustard [Brassica juncea (L.) Czernj. & Cosson] in view of higher cost and risk involved in cumin cultivation. Ail the double crop sequences and wheat (Triticum aestivum L. emend. Fiori & Paol.) grown after fallow responded to 100% of recommended fertilizer level (RFL). Additional manuring with farmyard manure (FYM) @ 5 tonnes/ha in 91 beyond 50% of RFL improved yield of double crops for 3 consecutive seasons. Mustard and cumin grown as monocrops required to be fertilized up to 50% of RFL and additional fertilization (organic or inorganic) did not bring about improvement in productivity any further.