Abstract
Ethrel (48%) at 1,5 litres product per hectare was applied during a period of active summer growth, to different varieties of sugarcane in the coastal and midlands regions. The treated cane was about one year old and was considered mature at the time of spraying (i.e. juice purity was over 80 per cent). Results showed that Ethrel stimulated growth on varieties NCo293, N55/805 and NCo310 by causing additional elongation of the upper internodes which were still elongating at the time of spraying. This stimulation in growth resulted in an increase in stalk mass and a concurrent reduction in sucrose per cent cane. NCo376, currently the most widely grown variety in South Africa, did not respond to treatment with Ethrel. These results further emphasize the importance of maturity testing of cane in the rainfed regions before applying Ethrel as a chemical ripener. Pro-Gibb Plus, a 10 per cent formulation of gibberellic acid (GA,), was applied between January and September usually as a double application of 690g product per hectare on each occasion. Trials were conducted in each of the three main ecological regions. Results showed that growth was stimulated only on variety NCo293 which received the first application of ProGibb Plus in January. The remainder of the trials were carried out on variety NCo376 which did not respond during the cooler winter months between April and September, even when irrigation water was applied. The effects of Ethrel and gibberellic acid (GA,) are compared and the possibilities of these plant growth regulators are discussed.
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Claims 7
Claim · model-written summary
Ethrel stimulated upper internode elongation in NCo293, N55/805 and NCo310.
- Taxon
- sugarcanet0
- Material
- NCo293, N55/805 and NCo310e0
- Treatment
- Ethrele0
- Outcome
- elongation of the upper internodese0
- Direction
- additionale0
Not reportedComparator
Verbatim
e0“Ethrel stimulated growth on varieties NCo293, N55/805 and NCo310 by causing additional elongation of the upper internodes which were still elongating at the time of spraying.”
t0“sugarcane”
Claim · model-written summary
Ethrel-induced growth increased stalk mass.
Not reportedComparator
Verbatim
e0“This stimulation in growth resulted in an increase in stalk mass and a concurrent reduction in sucrose per cent cane.”
e1“Results showed that Ethrel stimulated growth”
t0“sugarcane”
Claim · model-written summary
Ethrel-induced growth reduced sucrose percent cane.
Not reportedComparator
Verbatim
e0“This stimulation in growth resulted in an increase in stalk mass and a concurrent reduction in sucrose per cent cane.”
e1“Results showed that Ethrel stimulated growth”
t0“sugarcane”
Claim · model-written summary
NCo376 did not respond to Ethrel.
- Taxon
- sugarcanet0
- Material
- NCo376e0
- Treatment
- Ethrele0
- Outcome
- responde0
- Direction
- did not responde0
- Setting
- South Africae0
Not reportedComparator
Verbatim
e0“NCo376, currently the most widely grown variety in South Africa, did not respond to treatment with Ethrel.”
t0“sugarcane”
Claim · model-written summary
ProGibb Plus stimulated growth only in NCo293 receiving its first application in January.
- Taxon
- sugarcanet0
- Material
- NCo293e0
- Treatment
- ProGibb Pluse0
- Outcome
- growthe0
- Direction
- stimulatede0
- Qualifier
- first application of ProGibb Plus in Januarye0
Not reportedComparator
Verbatim
e0“growth was stimulated only on variety NCo293 which received the first application of ProGibb Plus in January.”
t0“sugarcane”
Claim · model-written summary
NCo376 did not respond to Pro-Gibb Plus during April to September, even with irrigation.
- Taxon
- sugarcanet0
- Material
- NCo376e0
- Treatment
- Pro-Gibb Pluse1
- Outcome
- responde0
- Direction
- did not responde0
- Qualifier
- cooler winter months between April and September, even when irrigation water was appliede0
Not reportedComparator
Verbatim
e0“The remainder of the trials were carried out on variety NCo376 which did not respond during the cooler winter months between April and September, even when irrigation water was applied.”
e1“Pro-Gibb Plus, a 10 per cent formulation of gibberellic acid (GA,)”
t0“sugarcane”
Claim · model-written summary
The authors emphasize maturity testing in rainfed cane before Ethrel ripening treatment.
Verbatim
e0“importance of maturity testing of cane in the rainfed regions before applying Ethrel as a chemical ripener.”
t0“sugarcane”
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