Identificação de deficiências minerais por meio da diagnose por subtração em solo do noroeste do Paraná cultivado com Capim-mombaça

Abstract

An experiment was carried out under greenhouse conditions at the Agronomy Department of the State University of Maringa (UEM), using the techniques of diagnosis through subtraction. Mineral nutrition in macro and micronutrients for Mombaca grass, cultivated in a soil originated from Caiua sandstone was analyzed. The soil was collected in a 0-20 cm layer in the northwest of the state of Parana, Brazil. A cut in the aerial part of plants at 59 days after Mombaca grass planting was performed and the obtained weight of dry matter was determined: weight of leaf fresh dry matter (PMSFF), weight of stem fresh dry matter (PMSFC), weight of root fresh dry matter (PMSFR), weight of aerial parts fresh dry matter (PMSPA) and leaf/thatch (F/C) rate. The number of affiliates (NP) was determined. The results showed that the soil was unable to furnish the nutritional requirements of Mombaca grass in N, P, K and micro, and it was able in terms of S. These data indicate the need of other experiments that may determine the amount and the better source of any nutrient that will stimulate a positive response to Mombaca grass