Sistema integrado de diagnose e recomendação (DRIS) para a cultura da soja (Glycine max L. Merril) na região de Rio Verde-GO
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Data
1998-08-28
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Universidade Federal de Goiás
Resumo
In order to diagnose the most limiting nutrients for soybean crop, in Rio Verde region,
GO, farms were divided in distinct and homogeneous plots. Soil and leaf sampling were
performed at the 50% soybean flowering stage. The third leaf from the top of 30 plants
were sampled per plot. Yield was estimated from plants in 1m rows in 10 points per plot.
Soil and tissue analysis were interpreted by critical levels and DRIS methods. The
diagnosis precision was tested by different DRIS indices (expressions, ratios) calculation
procedures. Plant nutrient condition diagnosis methods showed different interpretations.
The original Beaufils method was the most precise. As related to DRIS use for soils, the
resin-extracted P method was more precise than the Mehlich I extractor. Phosphorus
was the most limiting nutrient for soybean crop. Potassium applied in excess caused
exchangeable bases unbalance and induced a magnesium defficiency. The DRIS method
showed higher sensitivity to diagnose nutrition problems, especially for micronutrients.
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LEANDRO, Wilson Mozena. Sistema integrado de diagnose e recomendação (DRIS) para a cultura da soja (Glycine max L. Merril) na região de Rio Verde-GO. 1998. 190 f. Tese (Doutorado em Agronomia) - Universidade Federal de Goiás, Goiânia, 1998.