Relacion bases intercambiables--rendimiento de maiz en un Cambisol districo con labranza, encalado y abono verde | Relationship exchangeable bases--maize yield in a distric Cambisol under tillage, liming, and green manure
2005
Zetina-Lezama, R. | Trinidad-Santos, A. | Oropeza-Mota, J.L. | Volke-Haller, V. | Landois-Palencia, L.L.
In the spring and summer season of 1997 a field experiment was established in the southern part of Veracruz to study the long term effect of liming, green manure (Mucuna pruriens) and three intensities of tillage on soil sustainability and corn yield. After four years of continuous treatment and crop yield evaluations, soil sampling and chemical analysis were performed to determine bases and exchangeable acidity for each of the treatments; these values were correlated with corn yield. The results indicate that the calcium availability decreased from 0.800 to 0.375 cmol(c) kg(-1) soil when tillage intensity increased, and the same tendency was observed with potassium and magnesium. The percentage of exchangeable aluminum saturation decreased from 42.1% without liming to 23.1% with liming. All treatments with lime presented exchangeable aluminum saturation less than 40% which is the critical value for corn production. Liming increased corn grain and stover yield by 50 and 24%, respectively. It was observed that tillage intensity impoverished soil fertility but liming improved it, lowering the exchangeable aluminum saturation. The treatment maize-mucuna association plus liming negatively affected corn yield because of competition and fallen stalks.
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