ABSTRACT


Gotardo Schenkel S.1, Pedro Baherle V.2, Tatiana Floody A.3, Mauricio Gajardo M.4
 
A potted trial was carried out in order to study, using the Chaminade technique, the nutrient deficiencies of eleven of the province of Cautín. Rye-grass H-1 (short rotation) was planted. The treatments used were: complete fertilization, complete fertilization without one of the following nutrients: phosphorus, potassium, calcium, magnesium, sulfur, micronutrients (B, Cu, Zn, Mn, Mo) and a check without nitrogen. The intensity of any deficiency was evaluated by measuring the dry matter yield obtained per plant-pot, with respect to the complete fertilization.Measurements of dry matter in the successive cuttings allowed to conclude thatduring its growth, rye-grass released phosphorus, potassium and sulfur preferably in the last clippings. Being the results against the agronomic reality, "plant analysis" andsoil chemical, determination were made in order to secure a sound interpretation. Analysis showed that both phosphorus and potassium supply were progressivelysmaller after each clipping.Phosphorus and potassium content in the dry matter was progressively low. Accordingto foreign information rye-grass would be considered deficíent with respect tothese nutrients. After the clippings, all the soils, showed less than 0,10% of phosphorus,in the treatments without phosphorus. Less than 0,40% of potassium was determinedin the dry matter for the treatments without potassíum.Analysis performed indicate that the ultimate ferblity is similar for the differenttreatments of the same soil, with respect to phosphorus and potassium.Soils, initially deficient in phosphorus and potassium ( sulfur was not studied ) returnedto this condition at the end of the trial. The most important fact is that thiscondition was obtained even before the last clipping.
Keywords:
1Ing. Químico, Proyecto Fertilidad de Suelo, Estación Experimental Carillanca, Instituto de Investigaciones Agropecuarias, Casilla 58-D, Temuco, Chile.2Ing Agr. ProyectoFertilidad de Suelo, Estación Experimental Carillanca, Instituto de Investigaciones Agropecuarias.3Laboratorista Químico, Proyecto Fertilidad de Suelo, Estación Experimental Carillanca, Instituto de Investigaciones Agropecuarias.4Ayudante de Laboratorio e invernadero, Proyecto Fertilidad de Suelo, Estación Experimental Carillanca, Instituto de Investigaciones Agropecua