RDE Abstract of Completed Research
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Fertilization of Sugarcane
/ N x age at harvest
Rosario M. Bombio and Ninfa D. Navarro
To determine the proper age at harvest of Phil 94-0913 in relation to the time of 2nd dose N & K fertilization, two sets of experiment were conducted at SRA-LGAREC, La Granja City from January 2004 to December, 2005.
Insignificant results were noted in the growth parameters such as stalk length, stalk diameter, weight/stalk, total millable stalks as well as in TC/Ha., LKg/TC and LKg/Ha among the different period of 2nd dose N & K fertilization in relation to the age at harvest in both plant and ratoon crop.
However, regardless of fertilization timing, cane aged 11 months produced high sucrose content than canes harvested at aged 10 or 12 months.
A significant decline in tonnage per hectare of 8.7% & 15.9%, and 14.2% and 30.4% in LKg/Ha was noted at canes harvested earlier than 11 months or a month later, respectively.
In ratoon, although insignificant, cane fertilized with ½ N & K, 2 months after rationing, seemed to produce more tonnage than at fertilization full dose or ½ N & K applied later than 3-5 months after stubble shaving.
Regardless of fertilization timing, cane aged 12 months produced the highest tonnage/ sugar yield (98.72 TC/Ha / 223.44 LKg/Ha) comparable with cane aged 11 months (95.88 TC/Ha / 219.29 LKg/Ha). The lowest was at cane aged 10 months (91.17 TC/Ha / 202.62 LKg/Ha).
Second dose fertilization at 2 months in both plant & ratoon crop, harvested at 11 months, consistently obtained the highest cane & sugar yield which was reflected in the net profit, giving the highest ROI of 254.3% in plant cane & 251.10% in ratoon crop.
Generally, cane aged 11 months regardless of fertilization timing, obtained the highest average mean ROI of 242.34% in plant cane and 221.30% in ratoon crop. Cane aged 12 months got the lowest ROI in plant crop (151.36%), while in ratoon crop the lowest was at cane aged 10 months (201.64%).
Nitrogen Fertilization of Sugarcane for Cutback Canepoint Production (2006) Guevarra. M. and B. Manlapaz - In the plant and first ratoon crops, application of 80 to 110 kg N/ha gave comparable canepoint yield which were higher than 60 and 70 kg N/ha. In the second ratoon crop, 90 to 110 kg N/ha had comparable canepoint yield which were higher than 60, 70 and 80 kg N/ha.
- The 90 kg N/ha level gave the highest return on equity in the plant, first ratoon and second ratoon crops.
Influence of varying levels of N and ages at harvest (1998) Arturo Magnaye and Oscar Quilloy - Sugarcane planted in May on Angeles loamy
sand would need varying levels of N when harvested at different
ages. Cane tonnage increased proportionately with rate of N application
but sucrose content in the milled canes was affected by different
ages of harvesting and N fertilization. The highest sugar yield
at 12 months age of harvest was obtained when fertilized with
the recommended rate of N fertilization. Canes that will be harvested
at 8 to 10 months of age should be fertilized 50 and 25 percent
lower than the recommended rate, respectively.
Influence of varying levels of N and ages at harvest on sugarcane yields (1999) Arturo Magnaye and Oscar Quilloy - Sugarcane planted in May on Angeles loamy sand is best harvested at 10 months when fertilized with 90 and 135 kg/ha N. Plants fertilized with 180 kg/ha of N can be harvested at 8 to 12 months age of the crop but sucrose content is significantly less. Yields of the succeeding ratoon crop at varying levels of N fertilization were statistically comparable, while the best age at harvest was 10 months. During the early planting season in October, canes fertilized with 90 and 180 kg/ha of N can be harvested from 10 to 14 months with the highest sugar yields produced at 14 months age of harvest. The best age at harvest of plant cane fertilized with 135 kg/ha of N was at 10 months. In the ratoons, varying rates of N fertilization had statistically comparable yields. The succeeding ratoon crop can be harvested from 10 to 14 months although the highest yields were attained when harvested at 14 months.
Nitrogen requirements of sugarcane at different ages at harvest and season of planting (2000) Arturo Magnaye and Oscar Quilloy - Different rates of N fertilization were applied to sugarcane and were harvested at varying ages in both plant and ratoon crops. During late planting in May, the new plant fertilized with 90 and 135 kg N/ha produced high sugarcane yields when harvested at 10 months. Plant cane fertilized with 180 kg N/ha can be harvested from 8 to 12 months. The lowest yields were attained when the plant crops were harvested at 14 months. In the succeeding ratoon crop, sugarcane yields produced with 90, 135 and 180 kg N/ha at different ages at harvest were comparable.
- The best age of harvesting the ratoons was at 10 months. Sugarcane planted in October required varying rates of N fertilizer when harvested at different ages. At 90 and 180 kg N/ha, yields significantly increased up to 14 month age of harvest. Those fertilized with 135 kg N/ha would be better harvested in 10 months. Ratoon yields at 135 kg/ha were higher but statistically comparable with the 90 kg/ha N and 180 kg/ha treatment. Harvesting can be done at 10 to 14 month age of the ratoon crop.
