principles and application Singh, Phool. creator text us Enfield, NH Science Publishers 2008 monographic spa xix, 512 p. : grafs. ; cuadros. /by Phool Singh. Agricultura Modelos matematicos Cultivos Modelos matemáticos Sistemas de cultivo 631.5 S64 1578084180 95323 081029 20220329143340.0 000098858