Cenciani K.,Instituto Agronomico IAC APTA |
Freitas S.S.,Center for Research and Development of Soil and Environmental Resources |
Critter S.A.M.,Center for Research and Development of Soil and Environmental Resources |
Airoldi C.,University of Campinas
Revista Brasileira de Ciencia do Solo | Year: 2011
Enzymatic activity is an important property for soil quality evaluation. Two sequences of experiments were carried out in order to evaluate the enzymatic activity in a soil (Rhodic Eutrudox) amended with cattle manure, earthworm casts, or sewage sludges from the municipalities of Barueri and Franca. The activity of commercial enzymes was measured by microcalorimetry in the same soil samples after sterilization. In the first experiment, the enzyme activities of cellulase, protease, and urease were determined in the soil samples during a three month period. In the second sequence of experiments, the thermal effect of the commercial enzymes cellulase, protease, and urease on sterilized soil samples under the same tretaments was monitored for a period of 46 days. The experimental design was randomized and arranged as factorial scheme in five treatments x seven samplings with five replications. The treatment effects were statistically evaluated by one-way analysis of variance. Tukey ́s test was used to compare means at p ≤ 0.05. The presence of different sources of organic residues increased the enzymatic activity in the sampling period. Cattle manure induced the highest enzymatic activity, followed by municipal sewage sludge, whereas earthworm casts induced the lowest activity, but differed from control treatment. The thermal effect on the enzyme activity of commercial cellulase, protease, and urease showed a variety of time peaks. These values probably oscillated due to soil physical-chemical factors affecting the enzyme activity on the residues.
Galli J.A.,Polo Centro Norte APTA |
Martins A.L.M.,Polo Centro Norte APTA |
Ito M.F.,Instituto Agronomico IAC APTA |
Braghini M.T.,Instituto Agronomico IAC APTA |
And 2 more authors.
Revista Brasileira de Fruticultura | Year: 2011
The mango wilt is a disease caused by the fungus Ceratocystis spp., causing the death of mango trees in several Brazilian States. The objective of the present study was to evaluate the survival of varieties used as rootstocks under field and greenhouse conditions. Poliembrionic varieties were tested for resistance to Ceratocystis spp., with the inoculation method of the fungus in the soil in greenhouse. The surviving plants were planted in the Experimental Station of Pindorama and those considered promising were multiplied by grafting utilizing different rootstocks. After 17 years of the planting, an inventory of dead plants was made in the area. The rootstock Manila considered resistant to Ceratocystis had zero deaths and the rootstock Coquinho considered susceptible had 58.3% deaths. Two isolates of C. mangicola M. van Wyk and M.J. Wingf. were used to evaluate the varietal resistance in the greenhouse. The pathogen was cultivated in PDA medium and transferred for the liquid medium. Eight inoculations were accomplished with minimum 30 days interval using 5mL of the suspension. Dead plants were evaluated periodically. The experimental design used was completely randomized blocks, with 15 varieties and 4 replications. The method of inoculation with fungus suspension irrigated in the soil with 106 spores. mL-1 concentration confirmed to be efficient to select resistant rootstocks. The varieties Vitória, IAC 112, Dura and Bocado showed resistance to the isolates used in the experiment. The variety Juliana presented the same high degree of susceptibility of the variety Coquinho, both should be avoided in areas where the disease occurs.
De Godoy I.J.,Instituto Agronomico IAC APTA |
Dos Santos J.F.,Instituto Agronomico IAC APTA |
De Carvalho C.R.L.,Instituto Agronomico IAC APTA
Crop Breeding and Applied Biotechnology | Year: 2014
IAC OL 3 and IAC OL 4 peanut cultivars are new releases of Instituto Agronômico (IAC), Campinas, SP. These cultivars were developed to attend the demand of the Brazilian peanut business for high oleic runner cultivars, whose cycle can be better adjusted to the areas of sugarcane renewal than other runner cultivars. © 2014 Brazilian Society of Plant Breeding. All rights reserved.