Assessment of the Effect of Inter‐Cane Variability on the Sampling and Harvesting of Stalks of Sugarcane<sup>1</sup>

Yates, R. A.

doi:10.2134/agronj1969.00021962006100010038x

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Biomass yield and productivity estimates can be achieved by measuring crop components; number of plants and stalk weight represent the most important crop components that can be measured, with good correlation with productivity, according to Yates (1969) et al (1999). The biomass yield and productivity estimate was calculated by separately analyzing aerial phytomass (leaves), stalk phytomass, and straw phytomass in each sampling point (Pellegrino, 2001), always using fresh or green mass data.…”

Section: Methodsmentioning

confidence: 99%

Growth indices ans productivity in sugarcane

Simões

Rocha

Lamparelli

2005

Sci. agric. (Piracicaba, Braz.)

View full text Add to dashboard Cite

A knowledge about the temporal development of agronomic variables in sugarcane is a very important aspect for the development of crop yield prediction models using remote sensing, and further studies are still needed. This paper describes the temporal evolution of sugarcane biophysical parameters, such as total biomass, leaf area index, number of plants per meter, and productivity. During two seasons, a commercial field in Araras/SP, planted with variety SP80-1842, on the 4 th and 5 th cuts, was monitored on eight different dates, and data were obtained for 2 m of sugarcane in three crop rows at 18 sampling points. Linear and multiple regression analyses were used to study growth analysis and to correlate agronomic variables (leaf area index and number of plants per meter) with biomass and productivity. Gompertz model, a sigmoidal curve, was the best adjustment curve for total biomass and yield in relation to days after cutting (r 2 = 0.8987 and r 2 = 0.9682, respectively); number of plants and leaf area index showed best fit with a cubic exponential model and a quadratic exponential model, respectively. Total biomass and cane productivity were well correlated with LAI in the first two stages of the sugarcane cycle using linear regression. At the end of the cycle, total biomass and cane productivity were more related to number of plants, and lower r 2 values than in other stages were obtained by the models. Key words: biomass, leaf area index, crop temporal evolution INDICADORES DE CRESCIMENTO E PRODUTIVIDADE DA CANA-DE-AÇÚCARRESUMO: O conhecimento do desenvolvimento temporal de variáveis agronômicas da cultura da cana-deaçúcar é um aspecto preponderante, e ainda pouco explorado, para o desenvolvimento de modelos de entendimento e predição da produção em estudos de sensoriamento remoto. O presente descreve a análise da evolução temporal de variáveis agronômicas da cana-de-açúcar como a biomassa total (BMT), produtividade (TCH), índice de área foliar (IAF) e número de plantas por metro (NPM). Durante duas safras um talhão comercial em Araras/SP cultivado com a variedade SP80-1842 no 4 o e 5 o cortes foi acompanhado em oito campanhas de campo para a coleta de dados. O IAF, o NPM, a TCH e a BMT foram coletados em 18 amostras de 2 m em três linhas de cana-de-açúcar. Análise de regressão linear e múltipla foram usadas para a análise do crescimento da cultura e para o estudo da correlação e ajuste de modelos entre as variáveis agronômicas e a BMT e a TCH. O modelo Gompertz, de curva sigmoidal, foi o modelo que melhor se ajustou para a curva de BMT e para a TCH com r 2 = 0,8987 e r 2 = 0,9682, respectivamente. A BMT e o IAF tiveram melhores ajustes com curvas exponencial cúbica e exponencial quadrática, respectivamente. A BMT e a TCH foram bem relacionadas com o IAF nas duas primeiras fases do ciclo, ajustando-se regressões lineares. Para a fase de maturação, a BMT e a TCH foram mais relacionadas com o NPM que com o IAF e as curvas obtiveram valores menores de que r 2 que as demais fases do ciclo. Palavras-ch...

show abstract

Section: Methodsmentioning

confidence: 99%

Growth indices ans productivity in sugarcane

Simões

Rocha

Lamparelli

2005

Sci. agric. (Piracicaba, Braz.)

View full text Add to dashboard Cite

show abstract

“…The precision of the data obtained is of interest. The sample size of 20 canes per plot was based on the work of Yates (22). This was expected to give accurate estimates of quality (in erect cane), but not of cane weight.…”

Section: Experimental Techniquesmentioning

confidence: 99%

“…The field trials were conducted at the Miñi-Miñi Farm in Loiza, Land Authority of Puerto Rico Sugarcane Program, as representative of sugarcane growing in the humid northern coast, and the Mercedita Farm, Central Mercedita and Destino Farm, Central Aguirre, as representatives of the irrigated sugarcane of the southern coast. The experimental sites were selected to comply with two criteria: That the cane was erect, to make spraying with knapsack sprayers practicable and to minimize inter-cane variability (22); and that the cane approximated harvest age at the termination of the trial, i.e., that it was at least 8 months of age at spraying. Details of the sites and various treatments are given in table 1.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Chemical Ripeners for Sugarcane

Samuels¹,

Vélez²,

Yates³

et al. 1972

JAUPR

Self Cite

View full text Add to dashboard Cite

Eight chemical compounds were evaluated in 13 field experiments to determine if they could ripen sugarcane at the end of the harvest season, May-June 1970, on the humid northern coast (Loíza) and the irrigated southern coast (Aguirre and Mercedita) of Puerto Rico. C.P. 41845 (Monsanto) ripened sugarcane at Loíza and Mercedita when the control plots indicated dropping sucrose and purity values due to rainy weather. There were significant increases with the 2- and 4-pound per acre applications for pol, Brix and sucrose-percent-cane for the mean of the 6-week period after application. At Aguirre, there were no significant increases in sucrose components for individual samples or mean of all sampling dates. The control plots for this trial showed increasing sucrose and purity levels for the 6-week period. Pesco 1815 at 1.5-pound and 60CS16 at 0.5-pound per acre rates gave positive increases in the sucrose components, Brix, sucrose-percent-cane and purity at Mercedita, but not at Loíza. The results suggest that the success or failure of these three compounds to ripen the cane at the various experimental sites may depend on the degree and tendency of maturity of the cane. Cane with low or dropping sucrose and purity levels responded to the ripening compounds, whereas cane with naturally high or increasing sucrose or purity values failed to respond. Gibberellic acid, Dalapon, Silicon, Ethrel 68-250 and Cycocel failed to give significant increases in pol-percent-cane, Brix, sucrose-percent-cane or purity. The experimental techniques of applying sprays with a pneumatic-type tank equipped with a long lance for small-plot experimentation was discussed. To reduce the standard error it is suggested that the number of replications be increased and care taken in selecting plots for uniform stand and with a minimum of lodged cane.

show abstract

Assessment of the Effect of Inter‐Cane Variability on the Sampling and Harvesting of Stalks of Sugarcane¹

Cited by 2 publications

References 0 publications

Growth indices ans productivity in sugarcane

Growth indices ans productivity in sugarcane

Evaluation of Chemical Ripeners for Sugarcane

Contact Info

Product

Resources

About

Assessment of the Effect of Inter‐Cane Variability on the Sampling and Harvesting of Stalks of Sugarcane1

Cited by 2 publications

References 0 publications

Growth indices ans productivity in sugarcane

Growth indices ans productivity in sugarcane

Evaluation of Chemical Ripeners for Sugarcane

Contact Info

Product

Resources

About

Assessment of the Effect of Inter‐Cane Variability on the Sampling and Harvesting of Stalks of Sugarcane¹