Sistema integrado de diagnose e recomendação para a cultura do milho em espaçamento reduzido na região de Hidrolândia, Goiás
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2006-04-20
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Universidade Federal de Goiás
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Soil and leaves samples were collected and grain yield were evaluated in a commercial crop in order to diagnostic the limiting nutrients, deficiency or excess, on corn planted in 0.45 m row spacing, at Hidrolândia, Goiás. For the diagnosis of soil and leaves samples, were utilized sufficiency range approach, currently used in Brazil and the DRIS. The DRIS procedure for assessing nutritional status of plants by leaf and soil analysis utilizes standard values ( norms ) for nutrient rations rather than the nutrient itself. With the results of the analyses of corn leaves and soil, the population was divided in low and high yielding groups. DRIS norms were established using a yield of 5000 kg ha-1 to divide the data set into high and low yield subpopulations. The locally calibrated norms used to evaluate the nutritional status of the corn, from the leaves analysis, were compared to the others authors in several places. The geographic differences in DRIS norms were identified. For the calculation of indices DRIS differents procedures were used. The interpretation of the soil and leaves analyses by the different procedures of the DRIS methods and by the sufficiency range showed different responses with relation to the deficiency and/or excess of nutrients. The P and K in the soil analysis and B in the leaves analysis, in the majority of the procedures, were the most limiting nutrients by deficiency.
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ROCHA, Anisio Correa da. Diagnosis and recommendation integrated system (DRIS) in corn in reduced row spacing. 2006. 91 f. Tese (Doutorado em Ciências Agrárias) - Universidade Federal de Goiás, Goiânia, 2006.