00310nam a2200109Ia 450000500170000000800410001708200120005810000170007024500610008726000440014830000080019220260224040958.0260224s9999||||xx |||||||||||||| ||und||  a633 ACQ  aAcquaah, G.  0aPrinciples of crop production theory techniques of crop   aNew Delhi: Prentice Hall of Indiac2002  a460