Maize yield and nutrient content of soil as affected by deep-furrow liquid pig manure irrigation [Zea mays, soil fertility]

abonos agricultural chemicals agronomic characters amendement du sol animal animal domestique animal pour cuirs et peaux animales animales de carne animals artiodactyla artiodactyle cerdo cereales cereals composition crops cultivos cultivos de grano domestic animals economic plants engrais engrais organique enmiendas del suelo feed crops feed grasses fertilidad del suelo fertilizers ganado glumiflorae grain crops gramineae gramineas graminee grasses industrial crops irrigation irrigation systems livestock mammals meat animals monocotyledons oil crops plantas plantas azucareras plantas feculentas plantas forrajeras plantas industriales plantas oleaginosas plante plante de culture plante industrielle plants porcin productividad productivity produit agrochimique profitability rendement rendimiento rentabilidad riego sistemas de riego soil amendments soil fertility starch crops sugar crops swine vertebrados vertebrates vertebre yields zea mays