[Potassic fertility evaluation with an E.U.F. [electroultrafiltration] technique of a soil composted with almond shells in Spain]

abonos verdes almendra almonds amande analisi statistica analyse statistique analytical methods calcareous soils engrais vert espagne fertilidad del suelo green manures mandorle metodi analitici pericarp pericarpio pericarpo potasio potassio potassium prunus amygdalus soil fertility sol calcaire sovescio verde spagna spain statistical analysis suoli calcarei technique analytique ultrafiltration ultrafiltrazione