种茎直接补种桂糖42号宿根延长甘蔗年限的研究结果与效益分析—以广西象州县2017年的试验为例

目的]研究桂辐98-296(GF98-296)种茎直接补种桂糖42号(GT42)宿根蔗对农艺性状的影响,探讨GF98-296解决甘蔗宿根缺株断垄问题,为推广应用提供科学依据。方法]试验设计GF98-296种茎直接补种GT42宿根(A)、GT42种茎直接补种于GT42宿根(B)和自然状态GT42宿根(CK)3个处理,在GT42宿根苗期1-4张叶片时期实施补种,并调查各个处理的农艺性状及进行经济效益分析。结果] A处理产量达到77.93t/hm2,分别比B处理和CK增产14.15t/hm2、19.79 t/ hm2, 增幅分别达22.18%和34.03%,达到极显著差异水平,B处理的产量与CK之间差异不显著；直接补种处理均不影响GT42宿根的发株、成茎、产量和蔗糖分；A处理的GF98-296蔗茎蔗糖分略高于GT42宿根；通过GF98-296种茎直接补种GT42宿根,蔗农增收5506.6元/hm2,制糖企业可增加工业产值14813.2元/hm2。结论]GF98-296适宜作为GT42宿根的种茎直接补种品种,应对这项新技术进行大面积示范和推广。

Research and Benefit Analysis of Directly Replanting Seed Cane in GT42 Ratoon: An Example of Xiangzhou,Guangxi in 2017

We studied the effects of directly replanting GF98-296 seed cane in GT42 ratoon on agronomic traits of sugarcane, aiming to solve the problem of plant missing in sugarcane ratoon by using GF98-296. Three treatments were designed, which were directly replanting seed cane of GF98-296 in GT42 ratoon (A), directly replanting seed cane of GT42 in GT42 ratoon (B) and natural ratoon of GT42 (CK). Seed cane replanting was carried out in 1-4 leaf stage of GT42 ratoon, the agronomic traits of all treatments were investigated and the economicbenefitswereanalyzedinharveststage.TheresultsshowedthattheyieldofAtreatmentwas 77.93t/hm2, increased by 22.18% and 34.03% respectively compared with 14.15 t/hm2 of B treatment and 19.79 t/hm2 of CK. The difference between the yield of B and CK was not significant. Directly replanting treatment did not affect the growth, effective stem, yield and sucrose content of GT42. The sucrose content of GF98-296 in A treatment was slightly higher than that of GT42. Directly replanting GF98-296 seed cane in GT42 ratoon could increase the income by 5506.6 yuan/hm2 for sugarcane farmers, increase industrial output by 14813.2 yuan/hm2 for sugar enterprise. GF98-296 is suitable for directly replanting in GT42 ratoon, and this new technology should be demonstrated and promoted.