Effect of different combinations of nitrogen, phosphorous and farm yard manure on yield and quality of strawberry

abonos fosfatados abonos nitrogenados acide ascorbique application rates ascorbic acid composición aproximada composition globale dose d'application dosis de aplicación engrais azoté engrais phosphaté estiércol farmyard manure floración floraison flowering fragaria ananassa fraise fresa fructificación fructification fruiting fumier nitrogen fertilizers phosphate fertilizers proximate composition rendement rendimiento strawberries superfosfato superphosphate urea urée yields ácido ascórbico