双季晚稻机插育秧床土培肥效应研究

Seedbed soil fertilizing for mechanically transplanting seedlings of double-cropping late rice

为探明双季晚稻床土培肥用量,指导双季晚稻机插育秧实践。以杂交晚稻‘五丰优T025’为材料进行田间试验,研究了床土培肥对机插晚稻秧苗生育特性及产量的影响。结果表明:随着培肥水平的增加,秧苗苗高、假茎宽、根数、百苗干物质质量以及成秧率较对照显著增加,以N4处理最高,最高成秧率比对照提高10. 61%;培肥明显增加了机插晚稻的有效穗,各培肥处理分别比对照提高5. 70%、12. 33%、24. 10%、25. 99%,N3和N4差异不显著;每穗实粒数、结实率不断降低,其中N4处理分别比对照CK处理降低12. 11%和7. 31%;穗型变小,实际产量表现出先增加后降低的趋势,以每100 kg床土培肥600 g复合肥的处理产量最高。综上所述,双季晚稻机插育秧床土培肥量以每100 kg床土培肥600 g复合肥较为合理。

Seedbed soil is the foundation of machine-transplanted(MT)rice seedling.The aim of the study was to study the effects of different fertilizing quantity of 100 kg:200 g(N1)(applying 200 g compound fertilizer per 100 kg seedbed soil,the same below),100 kg:400 g(N2),100 kg:600 g(N3),100 kg:800 g(N4)and the control(no compound fertilizer,CK)on the growth characteristics and yields of MT late rice seedlings with the late rice cultivar‘Wufengyou T205’as an experimental material.The results showed that seedling height,leaf age,pseudo stem width,root number,dry biomass each 100 seedlings and strong seedlings increased significantly along with the fertilizing levels rising,up to the peak value at N4 and the biggest seedling survival percentage was 10.61%higher than the control.Effective ears by fertilizing treatments were 5.70%,12.33%,24.10%,25.99%higher than the control,respectively,and had no difference between N3 and N4.However,the filled grains per panicle and ripening rate reduced obviously,which was 12.11%and 7.31%lower than the control,respectively at the valley value.The yields increased then decreased at different fertilizing levels,up to the peak value at N3.To sum up,the fertilizing level N3 was more reasonable in the double season late rice by MT rice seedling.