FOLIAR CONTENTS IN BABYCORN AND CHEMICAL ATTRIBUTES OF AN OXISOL UNDER APPLICATION OF SWINE WASTEWATER
ResumoThis objective of this study was to evaluate the influence of swine wastewater (ARS), applied alone and in combination with nitrogen fertilizer (AD), on foliar concentrations of macronutrients (Ntotal, P, K, Ca, Mg and S ) and micronutrients (Cu, Zn, Mn and Fe), as well as chemical attributes of an Oxisol (pH, potential acidity (H+Al +3), organic matter (OM), cation exchange capacity (CEC), base saturation (V), Ca, Mg, K, P, Na, sodium adsorption ratio (SAR) and exchangeable sodium percentage (ESP) on the cultivation of baby corn. For this purpose an experiment was conducted at the State University of Western Parana in a completely randomized design with eight treatments and three replications, consisting of a 4 x 2 factorial arrangement with the application of four swine manure wastewater doses (0, 40, 80 and 120 kg ha-1 of N) prior to sowing and two levels of AD (0 and 40 kg ha-1 ) as urea at sowing and in coverage. Soil samples were collected at a depth of 0-60 cm during three periods: before sowing and application of the ARS, at the middle and at the end of the cycle. The results were subjected to analysis of variance at 5% probability, and they indicated that the application of ARS combined with AD resulted in increases to the soil chemical properties: H+Al +3, CTC, V, P, K, Ca and Mg, decreases in pH, organic matter and PST, and consistent values for RAS. For the foliar nutrient concentrations there was an increase in fertilization using wastewater from swine manure which resulted in significant differences for foliar concentrations of N and P in babycorn; it also promoted lower levels than adequate for N and K, and appropriate levels of Cu, Zn, Mn and Fe. Concentrations of ARS should be less than 345 m3 ha-1 when applied alone, or when combined with AD should be less than 120 kg ha-1 of N, since systematic use elevated levels of plant nutrients (P, Ca, Mg and S), suggesting their accumulation.
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