Evaluation of the effectiveness of sugar beet growing

abonos nitrogenados analyse input output assurance besoin en main d'oeuvre beta vulgaris costos costs credit credito czech republic demanda de trabajo farmyard manure fumier graine impuestos input output analysis insurance labour requirements nitrogen fertilizers pesticide pesticides plaguicidas precios prices prix profitability rendement rendimiento rentabilidad rotation culturale rotational cropping seeds seguros semilla soil sol suelo taxes yields