Total Recoverable Sugar Research Articles

Identification of commercial blocks of outstanding performance of sugarcane using data mining

In order to achieve more efficient agricultural production systems, studies relating to the patterns of influence factors on commercial blocks of outstanding performance can be performed to assist management practices. The performance is considered to be the difference between the yield of a given block and the average yield of the homogeneous group that it belongs to. The methods available to identify these outstanding blocks are usually subjective. The aim of this study was to propose an objective and repeatable approach to identify outstanding performance blocks. The proposed approach consisted of performance determination, using regression trees, and the classification of these blocks by k-means clustering. This approach was illustrated using a sugarcane model. The main factors influencing the tonnes of cane per hectare (TCH) and total recoverable sugar (TRS) yields were found to be crop age and water availability during ripening, respectively. These were used to create potential yield groups, and blocks with high and low performance were identified. The proposed approach was found to be valid in the identification of outstanding sugarcane blocks, and it can be applied to different crops or in the context of precision agriculture.

Effect of Micronutrients Soil Supplementation on Sugarcane in Different Production Environments: Cane Plant Cycle

Fertilization of sugarcane (Saccharum spp.) with micronutrients is not common and this can affect crop yield. Research results of micronutrients in sugarcane in Brazil are still scarce and inconclusive. The aim of the present study was to assess the sugarcane crop response to Cu, Zn, Mn, Mo, and B fertilization in different sugarcane production environments in the state of São Paulo, Brazil. An experiment was conducted at 11 locations. The treatments consisted of the application of fixed micronutrient doses only to the planting furrow as follows: control, Zn (10 kg ha−1), Mn (10 kg ha−1), Cu (10 kg ha−1), B (3 kg ha−1), Mo (2 kg ha−1), and complete (Zn +Mn + Cu + B +Mo). The design consisted of a randomized block with five replicates. The leaf content, tillering, sugarcane yield, and total recoverable sugar were determined in cane plant. The responses varied with location, soil type, climate, and variety. Positive responses to micronutrients application were observed in all parameters studied with the exception of total recoverable sugar. The sugarcane yield increased significantly with the application of micronutrients in the following order of magnitude: Zn > Mo = Mn > Cu > B = Complete, with yield gain of 18, 12, 12, 10, 9, and 9 tonnes of cane per hectare (TCH), respectively. Sugarcane responded positively to micronutrient, especially Zn fertilization, demonstrating that this practice may be economically viable and increase the productivity of Brazilian sugarcane fields, making agribusiness sugarcane more sustainable. Micronutrients can increase sugarcane yield. Zinc is the principal micronutrient to sugarcane producer. The application of high doses of micronutrients may increase the productivity of sugarcane Brazilians.

English

The sugar and alcohol sector has invested heavily in technologies to increase the productivity of sugarcane and consequently the gross income of sugar and alcohol; among these practices irrigation and fertilization stands out. The objective of this study is to evaluate the agro industrial and sugarcane yield (plant cane and first ratoon cycle) grown in the Sudoeste Goiano, Brazil, as affected by water replacement and nitrogen (N) rates; and to evaluate the residual effect from N rates on sugarcane ratoon grown under water replacement levels. The study was carried out with pots filled with a mixture of 120 kg of Oxisol (Rhodic Hapludox) and cattle manure, in a proportion of 3:1 v/v, respectively. A completely randomized design was used, 3x4, with three repetitions, analyzed in split plots. The treatments were combinations of three levels of replacement water (75, 50 and 25% of available water) and four N rates (0, 60, 120 and 180 kg ha-1, equivalent to pots), which were also the same doses for the treatment residual N rate. In both cycles, at harvesting the stem yield and the total recoverable sugar (TRS) were determined for calculation of gross income of sugar and alcohol. The plant cane was not affected significantly by any of the factors evaluated. Interactions between the residual N doses and water replacements influenced the TRS and the gross income of sugar and alcohol in ratoon cane, proving that the N applied on a cycle can be leveraged by another; the stem productivity was affected only by water replacements.   Key words: Residual nitrogen, sugar yield, alcohol yield, irrigation, stem productivity.

CORRELAÇÃO ENTRE COMPONENTES DA PRODUTIVIDADE DA CANA-DE-AÇÚCAR COM pH DE UM ARGISSOLO VERMELHO DISTRÓFICO DO NOROESTE PAULISTA

A produtividade agrícola depende primordialmente da capacidade produtiva dos solos. Assim, as práticas de adequação química do solo objetivam modificações nas suas características, com vistas a proporcionar melhores condições ao desenvolvimento das culturas. O presente estudo avaliou as correlações lineares e espaciais entre os atributos da produtividade da planta com o pH do solo. Na Fazenda Valença-I, Suzanápolis-SP, instalou-se uma malha geoestatística contendo 118 pontos amostrais, em uma área de 10,5 ha, onde foram analisados os atributos da cana-de-açúcar: produtividade de tonelada de colmos por hectare (TCH), população de plantas (POP) e açúcares totais recuperáveis (ATR); e como atributos químicos do solo: o pH (pH) e Delta pH (DpH), em diferentes profundidades no perfil (0-0,20; 0,20-0,40; 0,80-1,00 m). Os resultados indicaram que a correlação linear entre os atributos da planta com os do solo é significativa. A melhor correlação ocorre entre TCH com o pH na profundidade de 0,80-1,00 m. Espacialmente, há uma apreciável resposta entre a produtividade com o pH do solo na camada de 0,20-0,40 m. O DpH na camada de 0,80-1,00 m também apresenta importante interação com o ATR, o que permite inferir que melhor qualidade química na camada mais profunda proporciona melhor qualidade tecnológica do produto industrializável. Por fim, o estudo do solo nas camadas mais profundas (0,20-0,40 m e 0,80-1,00 m) aponta interação (linear e espacial) tanto com a produtividade quanto com o atributo tecnológico da cultura, apresentando-se como satisfatórios alvos de adequação química do solo.

Morpho-anatomical aspects and technological quality of saccharine sorghum submitted to plant regulators

Com o aumento na demanda de combustíveis renováveis, a indústria sucroenergética tem tido como desafio o aumento da produtividade agroindustrial, além da redução dos custos de produção. Atualmente, são escassos os relatos da utilização de reguladores vegetais na cultura do sorgo sacarino. O objetivo deste trabalho foi avaliar aplicação dos reguladores vegetais na qualidade tecnológica e aspectos morfoanatômicos do sorgo sacarino. O ensaio foi realizado na usina Cerradinho em Catanduva SP. As aplicações dos reguladores vegetais foram: etephon nas dosagens de 1,32, 0,66, 0,33 L ha-1, sulfometuron-methyl nas dosagens de 20, 10, 5 g ha-1, thiadizuron nas dosagens de 0,150, 0,100, 0,50 L ha-1, ethyl-trinexapac nas dosagens de 0,80, 0,40, 0,20 L ha-1 e controle. O experimento foi conduzido em Blocos Casualizados, no esquema de parcelas subdivididas com quatro repetições. Foram avaliadas as variáveis tecnológicas: pureza do caldo, açúcares redutores, açúcares totais recuperáveis, brix do caldo, pol do caldo, açúcares teóricos recuperáveis, fibra (%) e mensurados: espessura da epiderme da face adaxial (EAD); espessura da epiderme da face abaxial (EAB); diâmetro do esclerênquima (DE); espessura do mesofilo (MF); diâmetro dos vasos xilemáticos (DX) e diâmetro dos vasos floemáticos (DF). Para as características tecnológicas, os maturadores químicos sulfometuron-methyl e etephon nas doses 5 g ha-1 e 0,33 L ha-1, respectivamente, promoveram os melhores resultados a partir dos 37 dias após a aplicação. Para as características morfonatômicas, o maturador químico thiadizuron na dose 0,100 L ha-1 apresentou os melhores resultados aos 44 dias após a aplicação.

Technological quality and yield of sugarcane grown under nitrogen doses via subsurface drip fertigation

ABSTRACT This study characterized the technological quality and yield of sugarcane cv. SP80-3280 under nitrogen doses via subsurface drip fertigation. Five treatments were established using N-fertilizer in the form of urea (0, 50, 100, 150 and 200 kg N ha-1), with four replicates, applied via subsurface drip fertigation. The technological quality (fiber% cane; Brix% juice; pol% juice, pol% cane; juice purity and total recoverable sugar - TRS), as well as yield of stalks and sugar were determined 381 days after the third harvest. The technological variables Brix%, pol% juice, purity% and TRS of sugarcane, cultivar SP80-3280, were altered by the application of nitrogen doses via subsurface drip fertigation, with significant reductions at the dose of 200 kg N ha-1. Stalk and sugar yields increased linearly with the increment in nitrogen doses applied through subsurface drip fertigation.

Growth and yield of sugarcane as a function of phosphorus doses and forms of application

ABSTRACT This study aimed to evaluate sugarcane growth and its agricultural and industrial yield influenced by phosphorus (P) sources and forms of application. The experiment was carried out at the Paisa Sugar Mill, in Penedo-AL, Brazil, from February 2012 to February 2013. The adopted experimental design was a randomized block in a factorial arrangement, with four replicates. The treatments consisted of five doses of triple superphosphate applied in the planting furrow (0, 50, 100, 150 and 200 kg ha-1 of P2O5), and three doses of Bayóvar reactive phosphate rock (0, 100 and 200 kg ha-1 of P2O5) applied in the total area. Phosphorus applied in the planting furrow improved sugarcane quality through the reduction of fiber and increases in purity, corrected pol, total recoverable sugar, ton of pol per hectare (TPH) and ton of sugarcane per hectare (TSH). The Bayóvar reactive phosphate rock promoted increases in stem diameter at 120 days after planting (DAP), TPH and TSH. For the interaction triple superphosphate applied in the planting furrow x Bayóvar reactive phosphate rock applied in the total area, there were significant differences in the number of tillers at 30 DAP, stem diameter at 120 DAP and TSH.

<b>TRS value of sugarcane according to bioenergy and sugar levels

In the specific case of sugarcane, producers in Brazil are currently paid by the content of total recoverable sugars (TRS) in the raw material when it reaches the industry, according to CONSECANA: TRS = 9.6316 *PC +9.15 * RSS, where PC is the Pol in cane (apparent sucrose) and RSS are reducing sugars in sugarcane (glucose + fructose). The objective of the project was to propose changes in the procedures used to mathematically determine the TRS, estimating the calorific value of moist cake and weight of moist cake. The final model is then proposed: TRS = 25.9892 + 0.02172*CVmc*WMC+0.536*WMC – 4.14*CVmc + + 4.8158*PC + 4.575*RSS. Thus we obtain the TRS calculated according to the calorific value of moist cake (CVmc), weight of moist cake (WMC), Pol cane (PC) and the reducing sugars in sugarcane (RSS). This form is included in the estimation of TRS, the calorific value of moist cake, which reflects the bioenergy of fiber, weight of moist cake that estimates sugarcane fiber, in addition to existing factors Pol cane and reducing sugars in sugarcane. In the proposed model, the estimated values of TSR were 11.08% higher than the estimated values in the CONSECANA model.

Reduction of process steam demand and water-usage through heat integration in sugar and ethanol production from sugarcane – Evaluation of different plant configurations

The sugarcane industry represents one of the most important economic activities in Brazil producing sugar and ethanol for the internal and external markets. There are also plants dedicated only to ethanol production. The aim of this study is to accomplish a joint assessment to evaluate the reduction of process steam demand and water usage obtained through heat integration and an exergy analysis to quantify the reduction in irreversibility generation owing to heat integration procedure. Two configurations of plant were analysed Case I – all sugarcane juice is destined to produce ethanol without sugar production and Case II – distribution of 50%/50% of total recoverable sugars in sugar and ethanol production. Simulations in ASPEN PLUS® software were performed in order to evaluate the mass and energy balances and heat integration using the Pinch Method was applied in order to minimize the utilities consumption. The results showed that heat integration promoted a reduction in steam consumption of 35% approximately, while the reduction in water consumption (water collecting requirement) was 24 and 13% in comparison to the conventional cases without heat integration.

Modeling sugarcane ripening as a function of accumulated rainfall in Southern Brazil.

The effect of weather variables on sugarcane ripening is a process still not completely understood, despite its huge impact on the quality of raw material for the sugar energy industry. The aim of the present study was to evaluate the influence of weather variables on sugarcane ripening in southern Brazil, propose empirical models for estimating total recoverable sugar (TRS) content, and evaluate the performance of these models with experimental and commercial independent data from different regions. A field experiment was carried out in Piracicaba, in the state of São Paulo, Brazil, considering eight sugarcane cultivars planted monthly, from March to October 2002. In 2003, at the harvest, 12 months later, samples were collected to evaluate TRS (kg t(-1)). TRS and weather variables (air temperature, solar radiation, relative humidity, and rainfall) were analyzed using descriptive and multivariate statistical analysis to understand their interactions. From these correlations, variables were selected to generate empirical models for estimating TRS, according to the cultivar groups and their ripening characteristics (early, mid, and late). These models were evaluated by residual analysis and regression analysis with independent experimental data from two other locations in the same years and with independent commercial data from six different locations from 2005 to 2010. The best performances were found with exponential models which considered cumulative rainfall during the 120 days before harvest as an independent variable (R (2) adj ranging from 0.92 to 0.95). Independent evaluations revealed that our models were capable of estimating TRS with reasonable to high precision (R (2) adj ranging from 0.66 to 0.99) and accuracy (D index ranging from 0.90 to 0.99), and with low mean absolute percentage errors (MAPE ≤ 5 %), even in regions with different climatic conditions.

Efeitos da fertirrigação sobre a ocorrência e danos de Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) em cana-de-açúcar

O Brasil se destaca como o maior produtor mundial de cana-de-açúcar e sua produtividade está intimamente relacionada à disponibilidade de água e nitrogênio durante seu desenvolvimento e também à incidência de insetos-praga. Dentre as espécies mais nocivas à cana-de-açúcar no Brasil, destaca-se Mahanarva fimbriolata, a qual tem comprometido seriamente sua produtividade. Nesse contexto, o presente trabalho teve como objetivo avaliar o efeito da fertirrigação nitrogenada sobre a incidência e os danos ocasionados por M. fimbriolata em cana-de-açúcar. O experimento foi composto por cinco tratamentos e quatro repetições em delineamento de blocos casualizados (DBC). Os tratamentos foram constituídos por quatro doses de N-fertilizante e controle (0, 50, 100, 150 e 200 kg.ha-1) em sistema de irrigação por gotejamento. Os parâmetros avaliados foram: número de ninfas nas raízes, produtividade de colmos (TCH), produtividade de açúcar (TPH), açúcar total recuperável (ATR), pol de cana corrigido (PCC) e margem de contribuição agrícola. Foi observado que a produtividade de colmos e de açúcar aumentou com a adubação nitrogenada por meio da irrigação. O uso de 200 kg.ha-1 de N-fertilizante elevou a incidência de M. fimbriolata até os níveis de controle e dano econômico. O maior rendimento financeiro foi obtido com a dose de 150 kg.ha-1 de N-fertilizante.

Genetic analyses, phenotypic adaptability and stability in sugarcane genotypes for commercial cultivation in Pernambuco.

In the present study, we assessed the agro-industrial performance of 22 sugarcane genotypes adaptable to edaphoclimatic conditions in production microregions in the State of Pernambuco, Brazil, and we recommended the commercial cultivation of select genotypes. The variables analyzed were as follows: sucrose percentage in cane juice, tonnage of saccharose per hectare (TPH), sugarcane tonnage per hectare (TCH), fiber, solid soluble contents, total recoverable sugar tonnage (ATR), and total recoverable sugar tonnage per hectare (ATR t/ha). A randomized block design with 4 repeats was used. Combined variance of the experiments, genetic parameter estimates, and environment stratification were analyzed. Phenotypic adaptability and stability were analyzed using the Annicchiarico and Wricke methods and analysis of variance. Genetic gain was estimated using the classic index and sum of ranks. Genotype selection was efficient for TPH, TCH, and ATR t/ha. Genotypes presented a great potential for improvement and a similar response pattern in Litoral Norte and Mata Sul microregions for TPH and TCH and Litoral Norte and Litoral Sul microregions for ATR t/ha. Genotypes SP78-4764, RB813804, and SP79-101 showed better productivity and phenotypic adaptability and stability, according to the Wricke and Annicchiarico methods. These genotypes can be recommended for cultivation in the sugarcane belt in the State of Pernambuco.

Seleção de famílias e progênies de irmãos completos de cana-de-açúcar para atributos tecnológicos e de produção pelo método de REML/BLUP

O objetivo deste trabalho foi avaliar as famílias e destacar as progênies superiores de cana-de-açúcar oriundas de 38 cruzamentos biparentais para os seguintes atributos: tonelada de colmos por hectare (TCH), toneladas de biomassa por hectare (TBIOH), brix (% caldo da cana), teor de fibra, pureza, pol e açúcar total recuperável (ATR). Os dados foram analisados via modelos mistos REML/BLUP, em que o REML (Máxima Verossimilhança Restrita) permitiu estimar parâmetros genéticos e BLUP (Melhor Predição Linear Não Viciada) permitiu predizer os valores aditivos e genotípicos. A melhor família para os atributos TCH e TBIOH foi a 41, cujos parentais são as cultivares IACSP022019 x CTC9. Na seleção individual para TCH, a planta de n. 3 do bloco 2, do cruzamento 78 foi a que apresentou o melhor resultado. Para TBIOH, a planta n. 33, do bloco 1, da família 41 foi superior. As famílias 40, 41, 43, 68, 69, 79, 91, 92 e 147 foram superiores para as variáveis brix, pol, pureza e ATR, enquanto que as famílias 85, 147, 148, 149, 161, 163, 177, 178, 179 e 183 foram superiores para fibra. A família 147, cujos parentais são IACSP042286 x IACSP963055, mostrou três progênies entre as dez melhores tanto para brix quanto para fibra, o que identifica essa combinação como potencial fonte de progênies para produção de bioenergia.

Effects of Subsurface Drip Irrigation and Different Planting Arrangements on the Yields and Technological Quality of Sugarcane

AbstractThe objective of this work was to evaluate the effects of subsurface drip irrigation (SDI) and sugarcane spacing on stem yields, sugarcane technological quality, and the theoretical recoverable sugar yields during four cycles of sugarcane cultivation. The experimental field was set up in randomized blocks treated with three planting row spaces (1.5 m, 1.8 m, and a double row planting scheme with 1.3×0.5 m between the planting rows) and subdivided into fertigated and nonirrigated sections. The following parameters were analyzed: percentage of soluble solids contained in the juice (brix), percentage of apparent sucrose in the juice (Pol), total recoverable sugar (TRS), stem yield, and the theoretical recoverable sugar yield. The data were evaluated using analyses of variance, and mean values were compared using Duncan’s test with significance accepted at the 5% probability level. The results showed that irrigation increased stem yields in the ratoon cane cycles and that the theoretical recoverable ...

Phenotype adaptability and stability of sugarcane genotypes in the sugarcane belt of the state of Pernambuco, Brazil.

We assessed the agroindustrial performance of 25 sugarcane genotypes adapted to the edaphoclimatic conditions of the State of Pernambuco, Brazil, within the microregions Mata Norte, Mata Sul, Região Central, Litoral Norte, and Litoral Sul. The variables analyzed were POL tonnage per hectare, sugarcane tonnage per hectare, fiber and total recoverable sugar tonnage per hectare, using a randomized block design with four repetitions. Combined variance of experiments, genetic parameter estimates, decomposition of the genotype-environment interaction, and environment stratification were analyzed. Phenotype adaptability and stability were also analyzed. The various genotypes presented great potential for improvement and a similar response pattern to the microregions Centro and Mata Sul of the state of Pernambuco. Genotypes RB863129, RB867515, RB92579, RB953180, SP81-3250, RB75126, and RB942520 were better in productivity and phenotype adaptability and stability compared to genotypes RB892700, RB943365, SP79-1011, Q138, RB943538, SP78-4764, RB953281, RB943066, RB928064, RB93509, RB72454, RB952675, RB952991, RB943161, RB942898, RB872552, RB952900, and RB942849. These genotypes are recommended as cultivation options in the sugarcane belt in the state of Pernambuco, since they stand out in terms of phenotype adaptability and stability as evaluated using the method by Annicchiarico, Lin and Bins, and the method by Eberhart and Russel.

Modalities for soil preparation and gypsum application in ultisol: stem productivity of sugarcane

The study was conducted in an area of expansion of sugarcane at Vale do Paraná factory in Suzanápolis city - São Paulo (SP), in Brazil, in the northwestern region of the State of São Paulo. It was used the sugarcane variety RB92-5345, 1.5m of spacing between rows, in an Ultisol. The study aimed to evaluate the productivity of sugarcane and first ratoon and some soil chemical attributes in function of soil tillage and application or not of gypsum. The experimental design was randomized blocks with six treatments, in a factorial 3x2 and six replicates, the main treatments were soil tillage with three equipments, moldboard plow, chisel plow, and heavy harrow, and two secondary treatments with application of 1 t ha-1of gypsum and no gypsum. After each harvest of cane, the soil was characterized as to its fertility indicators in layers of 0.0-0.15; 0.15-0.30 and 0.30-0.45m. Differences in values of soil chemical attributes due to the methods of preparation occurred in the sugarcane did not last until the harvest of the 1st ratoon cane, and also did not influence the crop productivity. The gypsum application resulted in higher values of total recoverable sugar (TRS) and the productivity of tons of stems per hectare (TSH) to sugarcane and 1st ratoon cane, respectively, confirming the initial hypothesis.

Energia da biomassa de cana-de-açúcar sob influência de hidrogel, cobertura vegetal e profundidade de plantio

A colheita mecanizada é melhor executada em sulcos rasos. O palhiço promove maior retenção hídrica, diminui a evaporação superficial mas compromete a brotação. Polímeros alteram a fisiologia disponibilizando água e nutrientes. O objetivo deste trabalho foi compreender a relação da forma de plantio, do uso de palhiço em cobertura e do uso de polímeros condicionadores, com a produção de bioenergia (do colmo, do palhiço e do sistema), com a produtividade (de colmo, do palhiço e de biomassa), com a fibra e com o açúcar total (ATR). Utilizou-se a soqueira de cana-de-açúcar em parcelas subdividas (2 x 4), ou seja, duas profundidades e quatro doses do polímero. As parcelas foram subdivididas em tratamentos com quatro quantidades de matéria seca com três repetições. O uso de cobertura na quantidade de 5 t ha-1 foi prejudicial para a produtividade de cana-de-açúcar, biomassa e bioenergia. A forma de plantio e a utilização de polímero não alteraram as variáveis estudadas. Existe relação linear entre produtividade e bioenergia do colmo, produtividade de palhiço e bioenergia do palhiço. A bioenergia do sistema apresenta relação linear com a biomassa, fibra e ATR. A bioenergia se divide em 82,6% no colmo e 17,4% no palhiço.

EVALUATION OF DIFFERENT FOLIAR FERTILIZERS ON THE CROP PRODUCTION OF SUGARCANE

Influence of different foliar fertilizers (phosphite, micronutrients, biostimulant, phosphite + micronutrients, phosphite + biostimulant, micronutrients + biostimulant and phosphite + micronutrients + biostimulant) on yield of sugarcane was evaluated after fertilization at 30, 90 and 150 days after harvesting two-year-old sugarcane. The experiment was carried out in a commercial crop employing a randomized block design in four replicates. Higher stalk masses were observed for fertilization at 30 days after harvest, and the higher content of sucrose, total recoverable sugar and Brix degrees were observed for sugarcane fertilized after 150 days. Statistical analysis (Duncan's test) revealed no significant variation (P < 0.05) in Brix degree, sucrose content and total recoverable sugar. For total recoverable sugar x stalk weight (the main payment type for sugarcane producers), the following sequence (time treatment, fertilizer composition) 30-days, micronutrient + biostimulant; 150-days, biostimulant; and 90-days, biostimulant increased 11%, 17%, and 21% the yield of sugarcane.

Características agroindustriais da cana-de-açúcar em função da adubação fosfatada, em solos de Pernambuco

As recomendações para adubação fosfatada no Nordeste do Brasil não só estão baseadas em trabalhos conduzidos nas décadas de 70 e 80, mas requerem sua comendação que, especificamente no caso do fósforo, leve em consideração a capacidade máxima de adsorção de fosfato (CMAP); objetivou-se, então, avaliar as características agroindustriais da cana-de-açúcar em solos de Pernambuco em função da adubação fosfatada. Cinco experimentos foram conduzidos na Zona da Mata do Estado. Os solos foram classificados como: Argissolo Amarelo distrocoeso (PAdx); Latossolo Amarelo distrófico (LAd); Argissolo Amarelo distrófico (PAd); Gleissolo háplico eutrófico (GXve) e Espodossolo cárbico duripânico (EKo). Os tratamentos consistiram de sete doses de fósforo, determinadas em função da CMAP. O delineamento experimental foi em blocos ao acaso, com quatro repetições. As variedades utilizadas foram a RB863129, nos solos PAd, LAd, GXve e EKo e a RB855536, no PAD. A adubação fosfatada em cana planta influenciou positivamente as produtividades agrícola e industrial. Os valores de açúcares totais recuperáveis (ATR) não foram influenciados pela adubação fosfatada mas foram mais elevados nos solos com maior CMAP.

Seleção de progênies e correlação de componentes de produção em cana-de-açúcar

This study aimed to select progenies of sugarcane based on agroindustrial performance and to correlate agroindustrial characters. The experiment was carried out at the Usina São José, Igarassu, Pernambuco, Brazil, during the 2008/2009 crop year. The experiment was conducted in a completely randomized block design, with five replications. The analyzed variables were: tons of cane per hectare (TCH), tons of pol per hectare (TPH), corrected pol % (CP), soluble solid content (BRIX), the total recoverable sugar (TRS), tons of recoverable sugar per hectare (TRS t ha-1) and stalk number per meter (SNM). The variance analysis and genetic parameters estimate were performed. To correlate the characters, Pearson’s correlation coefficient and the partial correlations were used. The F test showed significance and high estimate of mean heritability for the variables TCH, TPH and TRS t ha-1, indicating the possibility of successful selection based on those characters. The values expressed by the correlation coefficients used in this study suggest that the practice of selection based on the characters SNM and BRIX contributes indirectly and significantly to cane and sugar productivity per hectare.