de Camargo M.S.,Polo Centro Sul |
Korndorfer G.H.,Federal University of Uberlandia |
Foltran D.E.,APTA Polo Centro Sul
Bioscience Journal | Year: 2014
Although silicon and sugarcane have been studied for decades in Brazil, there is little information regarding Si absorption by cultivars over time the relationship borer stalk incidence under field conditions. The objective of this study was to evaluate silicon uptake by above-ground dry mass and stalk borer incidence in nine sugarcane cultivars in two ratoon crops of sugarcane. The experiments were conducted in two ratoons in randomized complete blocks design with four replications and nine varieties (IAC 86-2480, IAC 91-1099, IAC 87-3396, IACSP 94-4004, IACSP 93-6006, IACSP-93-3046, IACSP-94-2094, IACSP 94-2101, RB 86-7515) in soil with high soluble Si (Kandiustalf). Silicon concentration on leaves +1 (TVD, top visible dewlap), sugarcane yield, Si uptake by by above-ground dry mass and stalk borer incidence. The IAC91-1099 showed highest cane yield (123.6 e 106.1 t ha-1), silicon uptake by above-ground dry mass (165.6 e 240.9 kg ha-1) and Si concentration on leaves+1 (15.2 e 17.9 g kg-1 Si) and the least level of stalk borer incidence (3.7 e 5.8%) in first and second ratoons, respectively. The average of Si uptake by above ground dry mass of all varieties in ratoon crops were reduced to 44% from observed to plant cane The lowest Si concentration on TVD-leaves collected at 6 months was related with D. saccharalis incidence observed to IAC 94-4004.
Abreu A.G.,APTA Polo Centro Sul |
Grombone-Guaratini M.T.,University of Sao Paulo |
Monteiro M.,APTA Polo Centro Sul |
Pinheiro J.B.,University of Sao Paulo |
And 2 more authors.
American Journal of Botany | Year: 2011
Premise of the study: Microsatellite primers were developed for Aulonemia aristulata, an endangered species of economic interest, to further describe its genetic variability and population structure. We also tested cross-amplification in 18 other bamboo species. Methods and Results: Using an enrichment genomic library, 13 microsatellite loci were isolated and characterized in A. aristulata. Seven of these loci were polymorphic. Twelve markers were cross-amplified in at least ten of the tested bamboo species. Conclusions: These markers will be useful for studies on the genetic diversity and structure of A. aristulata, which are important for future conservation, management and breeding programs of this species. © 2011 Botanical Society of America.
Camargo M.S.D.,APTA Polo Centro Sul |
Amorim L.,University of Sao Paulo |
Gomes Junior A.R.,University of Sao Paulo
Crop Protection | Year: 2013
Few studies have focused on the effect that silicon fertilisation has on the incidence of brown rust in sugarcane, even though this crop is Si-accumulating and Si addition has been shown to have positive effects in other plant-pathosystems. The objective of this study was to quantify brown rust development in sugarcane after the addition of silicon fertilizer to texturally distinct soils over three sugarcane cropping cycles. One experiment was conducted for three years with sugarcane grown in 100L pots receiving four levels of silicon fertilizer (0, 185, 370, 555kgha-1 Si), with three different soil types (Quartzipsamment-RQ; Rhodic Hapludox-LV; Rhodic Acrudox-LVdf), in randomised blocks design with four replications. Silicate fertilisation increased Si concentrations in the soil and sugarcane leaves. The incidence of brown rust was influenced by Si rates and soils type for the plant cane and second ratoon. For the plant cane, Si application reduced the maximum rust incidence, which was estimated by the b1 parameter of the monomolecular model, with values reaching 29%, 41% and 47% for the RQ, LV and LVdf, respectively. For the RQ, the b1 value was reduced by 20%, 20% and 59% of the control treatment values for the 185, 370 and 555kg ha-1 Si application rates, respectively. There was a significant reduction in brown rust incidence as a function of increasing leaf Si concentrations in all soil types. These results suggest that Si fertilisation could play an important role in the management of brown rust for sugarcane. © 2013 Elsevier Ltd.
Influence of the fertilization with nitrogen and phosphorus in the production of jambu (Acmella oleracea (L) R.K. Jansen) [Influencia da adubação com nitrogênio e fósforo na produção de Jambu, Acmella oleracea (L) R.K. Jansen]
Rodrigues R.S.,Institute Botanica Of Sao Paulo |
Camargo M.S.,APTA Polo Centro Sul |
Nomura E.S.,APTA Polo Vale do Ribeira Sul |
Garcia V.A.,APTA Polo Vale do Ribeira Sul |
And 2 more authors.
Revista Brasileira de Plantas Medicinais | Year: 2014
The objective of this work was to evaluate the influence of the use of nitrogen and phosphorus in the culture of jambu. The experiment was initiated at the experimental farm of the agency APTA Polo Vale do Ribeira, using the Nazaré cultivar. The experimental design was complete randomized with fourlevelsof nitrogen (0, 37.5, 75 and 112.5 kg ha-1 N) and phosphorus (0, 75, 150 and 300 Kg ha-1P2O5),and four reapplications. After soil preparation, liming and fertilization, seedlings of jambu were transplanted at a spacing of 0.50 × 0.5 m. The experimental plot was 1.0 × 1.0 m. Fresh and dry mass of leaves and flowers and number of flowers were analyzed. The production of fresh and dry leaves and flowers were influenced by fertilization. Thelevelsof nitrogen affected the outcome, as theyprovided a linear increase in all variables, and the phosphorus level of 75 kgha-1 P2O5 caused the highest average production in the number of flowers and in the fresh and dried mass of flowers.
de Camargo M.S.,APTA Polo Centro Sul |
Korndorfer G.H.,Federal University of Uberlandia |
Foltran D.E.,Apta Polo Centro Sul Upd Of Tiete |
Henrique C.M.,APTA Polo Centro Sul |
Rossetto R.,APTA Polo Centro Sul
Bragantia | Year: 2010
The variability of silicon absorption in sugarcane cultivars can be associate with its yield and sugarcane borer (D. saccharalis) incidence. The objective of this work was to evaluate silicon uptake by the leaves and accumulation in total aerial plant and its relationship to yield, quality and stalk borer in sugarcane cultivars. The experiment was carried out at Tietê, SP during March 2007 to July 2008, randomized complete blocks design with four replications and nine cultivars (IAC 86-2480, IAC 91-1099, IAC 87-3396, IACSP 94-4004, IACSP 93-6006, IACSP-93-3046, IACSP-94-2094, IACSP 94-2101, RB 86-7515). Yields were superior to 100 t ha-1 at 16 months of age and IAC 91-1099 and RB 86 7515 cultivars showed the highest diameter and height, respectively. The IAC 91-1099 showed the highest values of sugar and lowest to fiber content. Silicon content in leaves collected at 6 months showed not significant differences. The IACSP 93-3046, IACSP 93-6006 and IAC 91-1099 showed the highest silicon content in the leaves at 8 months and they were superior to 10 g kg-1 Si. Higher silicon content in the leaves was found for IAC 91-1099 at 10, 14 and 16 months and, in bagasse, to RB 86-7515 at 10 and 12 months. The foliar analysis collected at 8 months and the total aerial plant, collected just before harvest, were efficient to show differences on silicon uptake among cultivars. There was no relationship among Si uptake and yield and borer stalk incidence, which was reduced with increase of fiber content.