Resumen

MARTIN, Gloria M. et al. Evolution of some chemical properties of a soil after 20 years of agricultural exploitation. cultrop [online]. 2018, vol.39, n.4, pp. 21-26. ISSN 1819-4087.

The objective of the present work was to study the evolution of some chemical properties of a soil to compare its state of fertility, before and after remaining 20 years under intensive production of several cultivations. The Farm "La Asunción" belongs to the Cooperative of Credits and Services (CCS) "Nelson Fernández", municipality San José de las Lajas, county Mayabeque, Cuba. The climate is tropical subhumid and the soil is classified as Nitisol Rodic Eutric. The first sampling to evaluate the fertility of the soil was carried out in 1997 and in the year 2017 repeated the samplings. The content of organic matter was 2.55 % in 1997 and in 2017 was 2.97 %, the Test t (α=0.05) demonstrated that the two stockings are similar to each other. For the pH, in 1997 it was 6.34 and in 2017 ascended up to 7.25 due to the intensive use of watering waters with high content of calcium bicarbonate. For the calcium and the magnesium the values increased, in the calcium, of 8.32 to 17.61 cmol_c kg^-1 and for the magnesium, of 1.45 to 3.31 cmol_c kg^-1; however, in the case of the relationship Ca/Mg was not variations among the two realized evaluations. For the phosphorus it was an increase of the available contents of this element in the soil, of 49.53 mg kg^-1 in 1997 to 1 535 mg kg^-1 in 2017, related with the continuous applications of fertilizers, situation similar with the K₂O that varied from 0.007 to 1.22 cmol_c kg^-1. For the case of the capacity of exchange bases, it varied from 12.17 cmol_c kg^-1 up to 21.94 cmol_c kg^-1

Palabras clave : soils; fertilizers; nutrient content.

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