减氮条件下移栽密度与每穴苗数对早稻产量形成的影响

Effects of Transplanting Density and Seedlings Per Hills on Yield Formation of Early Rice under Nitrogen Reduceding

为明确减氮条件下早稻适宜移栽密度与每穴苗数,以陆两优996为试验材料,在祁阳市光华村开展大田试验,研究不同移栽密度(25 cm×11 cm、25 cm×14 cm、25 cm×17 cm)与每穴苗数(2、4、6本)对早稻产量及产量构成、穗部性状和干物质积累等的影响。结果表明,25 cm×11 cm、每穴4~6本处理产量较高,分别为9088.5 kg/hm^(2)和8775.0 kg/hm^(2),显著高于其他移栽密度与每穴苗数处理。从产量构成分析,该移栽密度与苗数下,有效穗数较多,结实率较高,千粒质量较大;从干物质积累分析,该移栽密度与苗数处理成熟期总干物质积累较多,收获指数较高。可见,减氮20%条件下,移栽密度25 cm×11 cm、每穴苗数4~6本有利于早稻产量形成。

For improving early rice yield with suitable tranplanting density and seedlings numbers under the condition of reducing nitrogen,using Luliangyou 996 as the test material,the effect of different transplanting densities(25 cm×11 cm,25 cm×14 cm,25 cm×17 cm)and seedlings number(2,4,and 6)per hills on early rice yield and composition,panicle traits and dry matter accumulation were determined in the paddy field of Guanghua Village,Changhong Street,Qiyang.The results showed that the highest rice grain yields of the treatment of 25 cm×11 cm,4 and 6 seedlings per hills were 9088.5 kg/hm~2 and 8775.0 kg/hm~2,respectively,which were significantly higher than other transplanting densities and seedlings per hills.From yield composition,the transplanting density and seedlings numbers,the number of effective panicles was largerer,the seed setting rate was higher,and the 1000-grain weight was higher;from dry matter accumulation,the transplanting density and seedlings numbers had higher total dry matter accumulation and the harvest index at the mature stage.Therefore,under the condition of reducing 20%nitrogen quantity,the transplanting density 25 cm×11 cm,4-6 seedlings per hills was conducive to the formation of early rice yield.