Effect of fertilization, soil reaction and soil nutrient availability on the cones yields of selected hop gardens

abonos npk analytical methods cones conos disponibilidad de nutrientes engrais npk farmyard manure fertilisation fertilizer application fumier genetic soil types hops houblon humulus lupulus muestreo npk fertilizers nutrient availability ph del suelo ph du sol poland pologne polonia rendement rendimiento sampling soil soil ph soil texture sol statistical methods suelo technique analytique textura del suelo texture du sol yields