Produtividade do cafeeiro em resposta ao manejo da calagem e gessagem em Latossolo de Cerrado

• Autor(a) principal: Camilo, Nilza de Fátima Pereira
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5546
• topic: Disponibilidade de cálcio e magnésio; Teores de cálcio e magnésio foliar; Taxa de recuperação de cálcio e magnésio; Calcium and magnesium supply; Calcium and foliar magnesium content; Recovering rates of calcium and magnesium; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO

The coffee culture in Minas Gerais is established, most of it, in Brazilian savannah soils, mainly latossols, applying limestone in overall area or in strip. The aims of this work were to compare the productivity of the coffee tree in response to different conducts, to determine doses of limestone with maximum economic efficiency (MEE) and the rates of recovering of Ca2+ and Mg2+ in the soil analyses, for different depths. The factors under study were: use limestone or limestone or gesso, divided in two application strategies in overall area or strip, that through replacement of limestone or limestone or gesso resulted in eight conducts: four in overall area (liming without replacement (CATSR); liming and gessagem without replacement (CGATSR); liming and gessagem with replacement of doses proportional to those planting (CGATRPP) and liming and gessagem with replacement corresponding to the need of liming (CGATRNC) and four in strip (liming with replacement of doses proportional to those of planting (CFRPP) liming and gessagem com replacement of doses proportional to planting (CGFRPP); liming with replacement corresponding to the necessity of liming (CFRNC) and liming e gessagem with replacement corresponding to the necessity of liming (CGFRNC) and six doses of limestone ( in overall area they were from 0,0 to 2,4 NC and , in strip from 0,0 to 1,5 NC). Mixed experimental matrix was used to define the treatments, Baconiana with Factorial [(21 + 2)] + 21], in which (21 + 2) correspond to treatments that received application in overall area and the other 21 in strip. The treatments were distributed in randomized blocks with three repetitions. Each useful plot consisted in two rows, with four plants per row. The CFRNC conduct was the best option aiming to obtain the best yield through liming with the lowest investment. Despite the results showed, in general, higher raising of pH, higher reduction on Al3+ levels and highest raising on Ca2+ and Mg2+ levels in the soil under different conducts regarding to the witness, on average, there was no significant difference in the coffee productivity among the conducts. The recovering rates of Ca2+ regarded to those of Mg2+ were similar at the beginning, as much in overall area as in strip, later those from Ca2+ were higher. The recovering rates of Ca2+ and Mg2+ decreased with depth. In the MEE doses the pH values were low to low; the levels of Al3+ ranged from medium to high and the levels of Ca2+ and Mg2+ were very low to low. In the leaves, the levels of Ca and Mg remained consistently, under the strip of adequacy.