Anais do XXXV Congresso Brasileiro de Ciência do Solo
RISK OF ZN DEFICIENT IN THE BRAZILIAN SOILS
FÁBIO HENRIQUE ALVES BISPO(1); MARIANA RUGER SACCO(2); MICHELE DUARTE DE MENEZES(2); ANA PAULA BRANCO CORGUINHA(2); GUILHERME AMARAL DE SOUZA(2); LUIZ ROBERTO GUIMARÃES GUILHERME(2); 1 - UNIVERSIDADE FEDERAL DE LAVRAS; 2 - UFLA;
Brazilian soils are commonly nutrient deficient. This work aimed to map the risk of zinc deficiency from chemical soil properties through techniques of geoprocessing. The data base is composed by samples collected in soil surface and its determined chemical properties. From this data base were generated maps of risk of Zn deficiency. There are indications that 44% of the studied area is under high risk of Zn deficiency related to pH values. Only 8% of the studied area is under low risk and it happens in the areas where the Zn contents are high and the pH are low. In relation to the clay contents, 60% of the studied area is under low risk of Zn deficiency. The interaction of all the clay classes with low Zn represents the high risk of Zn deficiency and 20% of the area is under this kind of risk. The interaction between Zn vs Pavailable showed that 63% of the total areas are under high risk of Zn deficiency and it is represented by the interactions medium Zn vs high Pavailable, low Zn vs high Pavailable, low Zn vs medium Pavailable, and low Zn vs low Pavailable. Although 65% of the area has presented adequate available Zn, we noticed that high pH and high available P occurred for nearly 28% and 45% of the area, respectively. The biggest risk was observed in the interaction between Zn and available P, which showed that 63% of the total areas are under high risk of Zn deficiency.
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