本文以20%氰氟草酯1500、2250、3000、3750 m L/hm24种不同剂量,分别在播种后10、15、20、25 d 4个时期施药,观察直播中稻田间千金子的防除效果和对禾苗的药害情况。结果表明:施用剂量为3000、3750 m L/hm^2时对千金子的防除效果最好,并...本文以20%氰氟草酯1500、2250、3000、3750 m L/hm24种不同剂量,分别在播种后10、15、20、25 d 4个时期施药,观察直播中稻田间千金子的防除效果和对禾苗的药害情况。结果表明:施用剂量为3000、3750 m L/hm^2时对千金子的防除效果最好,并且2种剂量防除效果差异不大;随着施药时期的推迟,对千金子的除草效果下降,但施药越早,田间第二批千金子萌发的概率越大;各试验处理对禾苗均未产生药害。最佳施药时期和施用剂量为播种后15d用3000mL/hm^2氰氟草酯对千金子的综合防效最佳,达到92.9%。展开更多
To clarify the effects of mechanical sowing and transplanting on dry mat- ter production of middle-season hybrid rice, a two-factor split plot design was used to study the effects of different sowing and transplanting...To clarify the effects of mechanical sowing and transplanting on dry mat- ter production of middle-season hybrid rice, a two-factor split plot design was used to study the effects of different sowing and transplanting methods and their interac- tion with the seedling number per hill or seeding time on dry matter accumulation, distribution and transformation of F You 498, a middle-season hybrid rice variety, under field conditions in 2012 and 2013. The results showed that there was a marked effect of the sowing and transplanting methods and their interaction with the seedling number per hill or seeding time on dry matter accumulation, distribution and transformation. The total population dry matter accumulation of the treatments with mechanical direct seeding （MDS） and machine-based transplanting （MT） was lower than that of the treatment with traditional manual transplanting （TMT）. How- ever, MDS had higher dry matter accumulation and accumulating rate in the joint- ing-earing stage,and maintained higher stem-sheath exportation, export rate and transformation than MT and TMT; MT had higher dry matter accumulation and ac- cumulating rate in the heading-maturity period than MDS and TMT. Moreover, the treatments with low seedling number per hill or early seeding enhanced the assimi- lation of dry matter after heading,the ratio of dry matter accumulation after earing to biomass yield and the contribution rate of dry matter accumulation after earing, and a reasonable early sowing was favorable to increase the harvest index of middle- season hybrid rice under mechanical sowing and transplanting conditions.展开更多
文摘本文以20%氰氟草酯1500、2250、3000、3750 m L/hm24种不同剂量,分别在播种后10、15、20、25 d 4个时期施药,观察直播中稻田间千金子的防除效果和对禾苗的药害情况。结果表明:施用剂量为3000、3750 m L/hm^2时对千金子的防除效果最好,并且2种剂量防除效果差异不大;随着施药时期的推迟,对千金子的除草效果下降,但施药越早,田间第二批千金子萌发的概率越大;各试验处理对禾苗均未产生药害。最佳施药时期和施用剂量为播种后15d用3000mL/hm^2氰氟草酯对千金子的综合防效最佳,达到92.9%。
基金Supported by Special Fund for Agro-scientific Research in the Public Interest(201303129)National Science and Technology Project for Bump Crop(2011BAD16B05)Scientific Research Foundation of Sichuan Agricultural University~~
文摘To clarify the effects of mechanical sowing and transplanting on dry mat- ter production of middle-season hybrid rice, a two-factor split plot design was used to study the effects of different sowing and transplanting methods and their interac- tion with the seedling number per hill or seeding time on dry matter accumulation, distribution and transformation of F You 498, a middle-season hybrid rice variety, under field conditions in 2012 and 2013. The results showed that there was a marked effect of the sowing and transplanting methods and their interaction with the seedling number per hill or seeding time on dry matter accumulation, distribution and transformation. The total population dry matter accumulation of the treatments with mechanical direct seeding （MDS） and machine-based transplanting （MT） was lower than that of the treatment with traditional manual transplanting （TMT）. How- ever, MDS had higher dry matter accumulation and accumulating rate in the joint- ing-earing stage,and maintained higher stem-sheath exportation, export rate and transformation than MT and TMT; MT had higher dry matter accumulation and ac- cumulating rate in the heading-maturity period than MDS and TMT. Moreover, the treatments with low seedling number per hill or early seeding enhanced the assimi- lation of dry matter after heading,the ratio of dry matter accumulation after earing to biomass yield and the contribution rate of dry matter accumulation after earing, and a reasonable early sowing was favorable to increase the harvest index of middle- season hybrid rice under mechanical sowing and transplanting conditions.
