Diagnose nutricional e classificacao de solos representativos dos pólos cacaueiros da Amazonia
Exploratory reconnaisance and detailed soil surveys were undertaken to identify and classify soil units in the new planting areas of the Brazilian Amazonia. Twenty of these soil units with showed a depth greater than 100 cm, medium to high native fertility, good moisture holding capacity and the presence of primary minerals in the soil profile were considered to be suitable for cacao cultivation. Fertility of the mapped soils were assessed under greenhouse conditions by means of biological assays using cacao as an index crop and results indicated that all the soil types were deficient in phosphorus. Eutrophic red podzolic soils also showed potassium deficiency. Yellow and red Latosols were also deficient in potassium, calcium and magnesium, and cacao seedlings grown in these soils expressed symptoms of zinc deficiency. All the soils did not respond to nitrogen, sulphur and boron.
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
1982
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| Subjects: | ZONAS CACAOTERAS, FERTILIDAD DE SUELOS, CLASIFICACION DE SUELOS, AMAZONIA, BRASIL, |
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