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| Effects of different fertilizer applications on cane yield and nutrient use efficiency of new sugarcane variety YT03-393 |
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| Abstract: |
| Cane yield and nutrient use efficiency of new-sugarcane variety Yuetang03-393（YT03-393）and the leading cultivar ROC22（as control）were studied through a field experiment with four fertilizer appilications：T1（conventional NPK fertilizers），T2（controlled release fertilizer），T3（silicon & magnesium fertilizers + NPK
fertilizers），and blank. Results showed that base fertilizer had no negative effect on the germination of both sugarcane
varieties，but actually increased the tillering rate. There was no significant difference in tillering of the three fertilization
treatments. The plant height of T2 and T3 of the two varieties was significantly higher than that of T1. Stalk diameter
of YT03-393 with three fertilization treatments was thicker than that of ROC22. Fertilization significantly increased
the millable stalks，though there was no significant difference between conventional fertilizer and controlled release
fertilizer. Cane yield of YT03-393 with T2 was the highest，and significantly higher than that of T1. Both cane yield and
sugar yield of YT03-393 with different fertilizations were significantly higher than those of ROC22. In term of sucrose
content in cane，there was no significant difference in all treatments. The orders of N/P/K nutrients accumulation in
sugarcane plant were：K>N>P，and YT03-393>ROC22. N/P/K nutrients agronomic efficiency and nutrients use efficiency of T2 were significantly higher than those of other treatments，and the order was YT03-393>ROC22.In summary，YT03-393，unlike ROC22，demands for more NPK nutrients due to its taller and thicker plant and greater potential in cane yield. Great attention shouldbe paid to basal fertilization，well-balanced application of N/P/K when planting this variety. Furthermore，application
of some trace elements，such as silicon and magnesium，and controlled release fertilizer were also advocated，in order to
enhance the fertilizer utilization and reduce the chemical fertilizer pollution to the environment. |
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