3. Economic importance of commercially extractable sugar content in sugarcane
In Australia, the standard industry measurement of sugar content is commercial cane sugar (CCS), which is derived from measurements of brix, pol, and fibre(BSES, 1984). CCS and other similar measures used in other countries are designed to estimate commercially recoverable sucrose in a sugar mill, reflecting the effects of impurities (dissolved, non-sucrose substances in cane juice) that cause sugar loss in molasses. However, CCS is also generally highly correlated with and similar to sucrose % on a fresh weight basis (Muchow et al., 1996). In Australian sugarcane breeding programs, cane
yield and CCS have traditionally been the two primary traits which are measured in most trials, with the product of these two traits being used to determine sugar yield. The relative economic value of changes in CCS and cane yield in sugarcane can be examined through analysis of the marginal changes in revenue and costs associated with such changes. Such a study was reported for the Australian sugar industry by Jackson et al. (2000). From a whole of industry perspective, the benefits from improving CCS were found to be up to 1.8 times greater than an equivalentproportional improvement in cane yield (Table 1). The increased benefit from CCS is due to the greater marginal costs of processing additional cane arising from increases in cane yield (harvesting, transport, and milling costs), compared to much smaller marginal costs associated with increased CCS (mill process additives and sugar transport costs). Clearly, assumptions
on sugar price and input costs used may vary in time and between industries in different countries, but these are broadly indicative of those in internationally competitive sugar industries. In the Australian sugar industry, price paid to growers per tonne of cane depends on CCS (Anon, 1997), so that the incentives and pressures for increasing CCS levels arise more
from the growing sector than the milling sector of the industry (Table 1). Some differences between regions occur because of differences in CCS and cane yield, and to a lesser extent, different marginal transport and milling costs across some regions.
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3. เศรษฐกิจความสำคัญของเนื้อหาในเชิงพาณิชย์ extractable น้ำตาลในอ้อยในออสเตรเลีย วัดน้ำตาลเนื้อหามาตรฐานอุตสาหกรรมเป็นธุรกิจน้ำตาล (CCS), ซึ่งได้มาจากการวัด brix, pol และเส้นใย (BSES, 1984) CCS และมาตรการอื่น ๆ คล้ายกันที่ใช้ในประเทศอื่น ๆ ออกแบบมาประเมินในเชิงพาณิชย์ลูกหนี้ซูโครสในโรงสีน้ำตาล สะท้อนให้เห็นถึงผลกระทบของสิ่งสกปรก (ไม่ใช่ซูโครสละลาย สารในน้ำเท้า) ที่ทำให้สูญเสียน้ำตาลในกากน้ำตาล อย่างไรก็ตาม CCS ได้ยังโดยทั่วไปสูง correlated กับ และคล้ายกับซูโครส%ตามน้ำหนักสด (Muchow et al., 1996) ในโปรแกรมการปรับปรุงพันธุ์อ้อยออสเตรเลีย เท้าyield and CCS have traditionally been the two primary traits which are measured in most trials, with the product of these two traits being used to determine sugar yield. The relative economic value of changes in CCS and cane yield in sugarcane can be examined through analysis of the marginal changes in revenue and costs associated with such changes. Such a study was reported for the Australian sugar industry by Jackson et al. (2000). From a whole of industry perspective, the benefits from improving CCS were found to be up to 1.8 times greater than an equivalentproportional improvement in cane yield (Table 1). The increased benefit from CCS is due to the greater marginal costs of processing additional cane arising from increases in cane yield (harvesting, transport, and milling costs), compared to much smaller marginal costs associated with increased CCS (mill process additives and sugar transport costs). Clearly, assumptionson sugar price and input costs used may vary in time and between industries in different countries, but these are broadly indicative of those in internationally competitive sugar industries. In the Australian sugar industry, price paid to growers per tonne of cane depends on CCS (Anon, 1997), so that the incentives and pressures for increasing CCS levels arise morefrom the growing sector than the milling sector of the industry (Table 1). Some differences between regions occur because of differences in CCS and cane yield, and to a lesser extent, different marginal transport and milling costs across some regions.
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