02154naa a2200169 a 450000100080000000500110000800800410001910000180006024500860007826000090016430000120017349000370018550001800022252013200040270000160172277302460173814667762007-07-27       2004    bl uuuu     u00u1 u    #d1 aSFREDO, G. J.  aEffect of sulfur application on soybean production, in four soil types of Brazil.  c2004  ap. 118.  a(Embrapa Soja. Documentos, 228).  aEditado por Flávio Moscardi, Clara Beatriz Hoffmann-Campo, Odilon Ferreira Saraiva, Paulo Roberto Galerani, Francisco Carlos Krzyzanowski, Mercedes Concordia Carrão-Panizzi.  aSulfur (S) is an important nutrient very little studied in soybean, which has resulted in the lack of information for the establishment of critical levels in soils and response curves of crops to this nutrient. In fact, soybean occupies extensive areas in Brazil and the addition of fertilizers requires rational recommendations. In 1998/99, sulfur research was conducted at several locations: Ponta Grossa, Paraná, in a alic oxisol (latossolo vermelho-escuro álico) soil, Londrina, Paraná, in a eutrofic oxisol (latossolo roxo eutrófico) soil, Sambaíba, Maranhão, in a dystrofic oxisol (latossolo vermelho-amarelo distrófico) soil, and Rondonopólis, Mato Grosso, in a dystrofic oxisol (latossolo vermelho-escuro distrófico) soil, to determine the effects of S on soybean yield. The experimental design was radomized blocks, with five S levels (zero; 25; 50; 75 and 100 kg ha-1). The source was the elementary sulfur, with 98% of S. The S response curves, across four locations, and year by averages, showed a quadratic response of grain yield, and highest production (3120 kg ha-1) was obtained with 50 kg ha-1 of S. The yield of 3115 kg ha-1, obtained with foliar application of S was similar to the best level of S applied to soil, showing this to be a reliable alternative, in case of is S defficiency.1 aKLEPKER, D.  tIn: WORLD SOYBEAN RESEARCH CONFERENCE, 7.; INTERNATIONAL SOYBEAN PROCESSING AND UTILIZATION CONFERENCE, 4.; CONGRESSO BRASILEIRO DE SOJA, 3., 2004, Foz do Iguassu. Abstracts of contributed papers and posters. Londrina: Embrapa Soybean, 2004.