The influence of seasonal conditions, plant species and fertilizer type on the prediction of plant yield using the Colwell bicarbonate soil test for phosphate

abonos abonos fosfatados analyse de sol crop yield crops cultivos engrais essai fertilisation fertilizer application fertilizers fosfato mineral fosfatos pastizales pastures phosphate phosphate fertilizers phosphate naturel phosphates plante de culture pruebas rendement des cultures rendimiento de cultivos rock phosphate soil testing superfosfato superphosphate trials