机插密度对陵两优104产量及产量形成的影响

Effects of Machine-transplanted Density on Yield and Yield Formation of Lingliangyou104

为了探明陵两优104在湖南地区适宜的机插密度,于2013年在长沙县路口镇明月村进行了机插秧大田试验,研究了3种机插密度(33.3万、25.0万、17.5万穴/hm2)对陵两优104产量及产量形成的影响。结果表明:随着机插密度的增加,陵两优104的产量呈增加趋势,其中以33.3万穴/hm2的产量最高,为9.66 t/hm2,较25.0万穴/hm2、17.5万穴/hm2分别增加了12.2%、22.4%。在高机插密度下,陵两优104有效穗多,叶面积指数较大,冠层光辐射截获率高,叶片光合能力强,有利于增加群体干物质生产量而获得高产。

In order to ascertain the suitable machine-transplanted density of Lingliangyou104 in Hunan area, a field experiment was conducted in Mingyue Village of Lukou Town of Changsha County in 2013, and the effects of three machine-transplanted densities（D1： 333 000 holes/hm2; D2： 250 000 holes/hm2; D3： 175 000 holes/hm2） on yield and yield formation of Lingliangyou104 were studied. The results showed that with the increasing of machine-transplanted density, the yield of Lingliangyou104 showed an increase tendency; the highest yield of Lingliangyou104 showed in D1 by 9.66 t/hm2, it increased by 12.2% and 22.4% in comparison with D2 and D3, respectively. With high machine-transplanted density, Lingliangyou104 can achieve high yield with more effective panicles, large index of leaf area, high probability of intercepting light radiation by canopy, and strong leaf photosynthetic capacity, thus increasing amount of dry matter production and high yield.