Abstract
Historically, few articles have addressed the use of district level mill production data for analysing the effect of varietal change on sugarcane productivity trends. This appears to be due to lack of compiled district data sets and appropriate methods by which to analyse these data. Recently, varietal data on tonnes of sugarcane per hectare (TCH), sugar content (CCS), and their product, tonnes of sugar content per hectare (TSH) on a district basis, have been compiled. This study was conducted to develop a methodology for regular analysis of such data from mill districts to assess productivity trends over time, accounting for variety and variety environment interaction effects for 3 mill districts (Mulgrave, Babinda, and Tully) from 1958 to 1995. Restricted maximum likelihood methodology was used to analyse the district level data and best linear unbiased predictors for random effects, and best linear unbiased estimates for fixed effects were computed in a mixed model analysis. In the combined analysis over districts, Q124 was the top ranking variety for TCH, and Q120 was top ranking for both CCS and TSH. Overall production for TCH increased over the 38-year period investigated. Some of this increase can be attributed to varietal improvement, although the predictors for TCH have shown little progress since the introduction of Q99 in 1976. Although smaller gains have been made in varietal improvement for CCS, overall production for CCS decreased over the 38 years due to non-varietal factors. Varietal improvement in TSH appears to have peaked in the mid-1980s. Overall production for TSH remained stable over time due to the varietal increase in TCH and the nonvarietal decrease in CCS.
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Claims 9
Claim · model-written summary
Q124 was the top ranking sugarcane variety for TCH.
Verbatim
e0“effect of varietal change on sugarcane productivity trends”
e1“Q124 was the top ranking variety for TCH”
Claim · model-written summary
Q120 was the top ranking variety for both CCS and TSH.
Verbatim
e0“effect of varietal change on sugarcane productivity trends”
e2“Q120 was top ranking for both CCS and TSH”
Claim · model-written summary
Overall TCH production increased over the 38-year period.
Verbatim
e0“effect of varietal change on sugarcane productivity trends”
e3“Overall production for TCH increased over the 38-year period investigated”
Claim · model-written summary
Some of the TCH increase is attributed to varietal improvement.
Verbatim
e0“effect of varietal change on sugarcane productivity trends”
e4“Some of this increase can be attributed to varietal improvement”
Claim · model-written summary
Predictors for TCH have shown little progress since the introduction of Q99 in 1976.
Verbatim
e0“effect of varietal change on sugarcane productivity trends”
e5“the predictors for TCH have shown little progress since the introduction of Q99 in 1976”
Claim · model-written summary
Varietal improvement for CCS made smaller gains.
Verbatim
e0“effect of varietal change on sugarcane productivity trends”
e6“Although smaller gains have been made in varietal improvement for CCS”
Claim · model-written summary
Overall CCS production decreased over the 38 years due to non-varietal factors.
Verbatim
e0“effect of varietal change on sugarcane productivity trends”
e7“overall production for CCS decreased over the 38 years due to non-varietal factors”
Claim · model-written summary
Varietal improvement in TSH appears to have peaked in the mid-1980s.
Verbatim
e0“effect of varietal change on sugarcane productivity trends”
e1“Varietal improvement in TSH appears to have peaked in the mid-1980s”
Claim · model-written summary
Overall TSH production remained stable due to the varietal increase in TCH and the non-varietal decrease in CCS.
Verbatim
e0“effect of varietal change on sugarcane productivity trends”
e1“Overall production for TSH remained stable over time due to the varietal increase in TCH and the nonvarietal decrease in CCS”