不同种植制度下机插双季稻产量、干物质生产及氮素利用比较

摘要

为明确种植制度对机插双季稻产量、干物质生产及其氮素吸收利用的影响,以常规稻‘中早39’为材料进行多点联合定位试验.结果表明:各处理和地点间产量均存在差异.地点间产量表现为衡阳＞岳阳＞长沙;早稻处理间产量整体趋势表现为稻—稻—油(RRO)＞稻—稻—紫云英(RRG)＞稻—稻—冬闲(RRF);晚稻表现为RRG＞ RRO＞ RRF.与对照RRF相比,RRG和RRO均有不同程度的增产,全年增产量分别为0.85 t/hm2和0.99t/hm2;同时,与RRF相比,RRG和RRO处理的总颖花数、干物质积累量以及氮吸收总量均有一定优势.%In order to explore the effect of crop rotation system on yield,dry matter production and nitrogen utilization of machine-transplanted double cropping rice,a field experiment with three cropping systems (rice-rice-fallow,rice-rice -oilseed rape and rice-rice-green manure) was conducted with conventional indica rice variety ‘ Zhongzao 39’ in both early and late seasons at three sites in 2016.The results showed that there were significant differences of the yields among different treatments and sites.The rank for yield among different sites was Hengyang ＞ Yueyang ＞ Changsha,and among different treatments,the rank was rice-rice-oilseed (RRO) ＞ rice-rice-green (RRG) ＞ rice-rice-fallow (RRF) in early season,RRG ＞ RRO ＞ RRF in late season.The annual yields of RRG and RRO were 0.85 t/hm2 and 0.99 t/ hm2 higher than those of RRF.Meanwhile,the spikelets per m2,total dry matter production and nitrogen assimilation of RRG and RRO were higher than those of RRF.