ABSTRACT


Gotardo Schenkel S.1, Pedro Baherle V.2, Horacio Floody A.3 y Mauricio Gajardo M.4
 

The behaviour of 43 soil samples from island's sites of Chiloé are studied with three fertilization mixtures in pot experiments.
Only when nitrogen, phosphorus, potassium and sulfur are incorporated together into the soil, its fertility is increased efficiently. The failure observed with the NP fertilization is explained because the potassium deficiency subsists, even though phosphorus scarcity is overcome.
There are no significant differences among the results obtained with the same fertilization mixtures when applied to samples of different depths. Apparently the N fertilization behaves better on top soil samples. The contrary is true for NP and NPKS.
Micronutrientes are considered important in orde to increase the fertility level of the Chiloé soils, mainly when the level obtained by the NPKS applications is low. For some of the samples, a deppresive effect caused by the addition of magnesium or calcium carbonates is observed.

Keywords:
1Ingeniero Químico, Proyecto Fertilidad de Suelo, Estación Experimental Carillanca, Instituto de Investigaciones Agropecuarias (INIA), Casilla 58-D, Temuco, Chile.
2Ing. Agr., Proyecto Fertilidad de Suelo, Estación Experimental Carillanca, INIA.
3Laboratorista Químico, Proyecto Fertilidad de Seulo, Estación Experimental Carillanca, INIA.
4Ayudante de Laboratorio, Proyecto Fertilidad de Suelo, Estación Experimental Carillanca, INIA.