Time filter

Source Type

Marília, Brazil

Silva M.A.,Polo Centro Oeste | Goncalves P.S.,Instituto Agronomico Of Campinas Iac
Ciencia Rural | Year: 2011

Sugarcane species are allogamous, i.e. selfing is expected to reduce plant vigor. This study was undertaken to obtain and evaluate first-generation inbred lines that may be used for further crosses and determine the extent of inbreeding depression in sugarcane. In this research, 26 parental varieties were self-pollinated to obtain about 19,000 seedlings. Results showed that it is possible to segregate different traits in a given variety and find lines with promising outcome for all assessed characteristics. The soluble solids segregation observed in low and even high-Brix varieties increases the possibility of quick improvement in this trait. Self-pollination did not produce a general loss in yield traits such as soluble solids, stalk number and stalk diameter in any of the 26 varieties, but both stalk height and stalk weight showed strong inbreeding depression. Selfing-derived clones can be used to produce hybrid vigor in crossings.

The present work aimed to evaluate the application of plant growth regulators, associate or not to liquid fertilizers, on the ratoon sprouting and productivity of sugarcane genotypes. The experiment was carried out near Jaú city (SP), in a Eutroferric Red Latosol. The experimental design was in randomized complete blocks with factorial treatment structure 5x5, constituted by five genotypes (IAC87-3396, IAC91-2218, IAC91-4216, IAC91-5155 and IACSP93-6006) and five plant growth regulators treatments associated or not to liquid fertilizers (Stimulate®, 0,5L ha-1; Stimulate®, 0,5L ha-1, + Starter N®, 3,0L ha-1; Stimulate®, 0,5L ha-1, + Starter N®, 3,0L ha-1, + Cellerate®, 0,5L ha-1; Ethephon, 3,0L ha-1, and control), with four replicates. The application of the products occurred at 70 days after the fourth crop harvest. The attributes tillering, stalk productivity, sugar productivity, fiber, pol % cane and total sugar recoverable were evaluated. Ethephon provided better tillering, but this response was dependent of the genotype. The highest tiller number caused by Ethephon did not mean the highest productivity. The application of Stimulate® and liquid fertilizers did not provide effects on the sugarcane technological quality. There was increase of cane productivity and sugar productivity with the use of plant growth regulator Stimulate® for all genotypes, with or without supplementation of liquid fertilizer, being an indicative for increasing the sugarcane longevity.

Santos D.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuaria | Saad J.C.C.,Sao Paulo State University | De Castro Gava G.J.,Polo Centro Oeste
American Society of Agricultural and Biological Engineers Annual International Meeting 2014, ASABE 2014 | Year: 2014

This research aimed to assess the relationship between the utilization of a subsurface drip irrigation (SDI) system with productivity and distribution of roots in two cultivars of sugarcane (Saccharum spp.). The work was conducted at county of Jaú, São Paulo, Brazil (22° 17's latitude, 48° 34° longitude and average elevation of 580 m). The experimental design was randomized plots, with eight treatments obtained by the combination of two cultivars RB 86-7515 (C1) and RB 85-5536 (C2), under two conditions irrigated (I) and rainfed (S), during two growing cycles. All treatments were planted in double row, spacing 0.40 m between simple lines and 1.80 m between double lines. In irrigated management, the lateral lines were buried at 0.20 m depth in the middle of the double lines. After each harvest, 24 trenches were dug to capture root system images using the profile method, then the images were analyzed using SAFIRA software, resulting in length, area, and volume of the root system. The productivity of the crop yield (TCH) and sugar (TPH) for irrigated C1 was significantly higher than the rainfed C1, irrigated C2 and rainfed C2, in the first harvest. In the first ratoon there was no significant difference among cultivars, but there was a difference between the irrigated and rainfed. The C1 showed lower values for roots length, area, and volume when compared to C2, but the irrigation management presented a distribution more homogeneous along the profile, with no predominance of roots in the surface layer as in non-irrigated management.

Suguino E.,Polo Centro Leste | Santos-Cividanes T.M.D.,Polo Centro Leste | Cividanes F.J.,Paulista University | Faria A.M.D.,Polo Centro Leste | Martins A.N.,Polo Centro Oeste
Florida Entomologist | Year: 2013

We recorded the occurrence of Compsus sp., Compsus niveus, Platyomus cultricollis, and Rembus auricinctus (Coleoptera: Curculionidae) in tea plantations in the municipality of São Miguel Arcanjo, SP, Brazil. The damage caused by these insects is related mainly to the presence of insect fragments in dried tea leaves, hindering the marketing of the product. This is the first report of the occurrence of weevils in tea crops in Brazil.

Kolln O.T.,CTBE - Brazilian Bioethanol Science and Technology Laboratory | de Castro Gava G.J.,Polo Centro Oeste | Cantarella H.,Instituto Agronomico Of Campinas Iac | Franco H.C.J.,CTBE - Brazilian Bioethanol Science and Technology Laboratory | And 3 more authors.
Sugar Tech | Year: 2015

The aim of this study was to evaluate the response of sugarcane to nitrogen (N) application with drip irrigation and the relation with carbon isotope discrimination (Δ13C), aboveground dry matter cane yield and the N balance in consecutive ratoon crops of sugarcane. An experiment was set up in Jaú, SP, Brazil, in which the second and third ratoon crop cycles (2008/2009 and 2009/2010) were evaluated. The experiment included an unfertilized N control in both years (T1), and the following three nitrogen (N) fertilizer rates (in kg ha−1) applied in 2008 and 2009, respectively: 70 and 50 (T2), 140 and 100 (T3), and 210 and 150 (T4). Fertilization with N caused a marked gain in stalk yields by 98 Mg ha−1 in 2 years. The N export with harvest was higher than N application in the control treatment T1 and at the lower rate (T2); this, in addition to the observed linear response to N, indicate the need to increase N fertilization in irrigated sugarcane. The values of Δ13C decreased with the increase of N supply showing a significant negative correlation (p < 0.05) with stalk as well as whole plant aboveground dry matter yields. The values of Δ13C in top leaves may be used as a tool to characterize the N status of sugarcane plants and its relation to aboveground dry matter and yield. © 2015 Society for Sugar Research & Promotion

Discover hidden collaborations