《Table 4 Yield performance of GT42 under different fertility》

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《Performance of the Sugarcane Variety GT42 in Jinguang Farm of Guangxi》

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It could be seen from Table 4 that for new plant，the cane yield and sugar yield of GT42 were not significantly different from the CK under high and low fertility，but significantly higher than the CK under medium fertility.For ratoon cane，the cane yield and sugar yield of GT42 were higher than those of the CK，with significant or very significant differences.Though for the mean of new plant and ratoon 1，the cane yield and sugar yield of GT42were only significantly higher than the CK under high fertility，for the mean value of new plant and ratoon 1 and 2 and the mean value of new plant and ratoon 1，2 and 3，the average cane yield and sugar yield of GT42 were both significantly or very significantly higher than those of the CK，i.e.，with the ratoon years growing，the yield increase between GT42 and the CK increased，exhibiting remarkable superiority，and especially under high fertility，the yield increase was the highest.It was indicated that the yield of GT42 was equivalent to that of the CK for new plant，but higher than that of the CK for ratoon cane，and thus had remarkable superiority，which might be due to that it had more ratoon plants and a higher effective stem rate than ROC22，and the effective stems of ratoon 3 still could reach 48 500-57 400 plants/hm2.