不同种植模式对高粱晋糯3号产量和养分吸收的影响

为了明确高粱新品种晋糯3号的最佳种植模式,研究了不同行距及密度对晋糯3号产量和养分吸收的影响。试验共设3个行距：30、50和60cm,每个行距处理设4个密度：4.5万、7.5万、10.5万和13.5万株/hm ²。结果表明,行距50cm时,晋糯3号单株叶面积、叶面积指数（LAI）、单穗粒数及产量最高,其次为行距60cm,行距30cm处理最低;相同行距时,密度为13.5万株/hm ²时产量较高,但与密度10.5万株/hm ²的产量没有显著差异。密度为4.5万株/hm ²时晋糯3号单穗粒数是密度为10.5万和13.5万株/hm ²时的1.8~2.0倍,产量为同一行距最高产量的72%~88%,这表明晋糯3号具有较强的群体调节能力。行距50cm结合密度4.5万株/hm ²促进了开花后植物对氮的吸收,开花后植株较强的氮素吸收能力是低密度产量提高的主要因素之一。行距50和60cm密度为10.5万和13.5万株/hm ²时产量较高且没有显著差异,但行距50cm有利于氮磷钾养分的吸收,为此晋糯3号的最佳种植模式为行距50cm结合密度10.5万~13.5万株/hm ²。

Effects of Different Planting Patterns on Yield and Nutrient Absorption of Sorghum Jinnuo 3

A field experiment was carried out to study the effects of planting patterns on yield and nutrient accumulation of sorghum Jinnuo 3 at three row spacing: 30cm, 50cm and 60cm. There were four densities:45 000, 75 000, 105 000 and 135 000 plants/hm ² under each row spacing. The results showed that row spacing of 50cm resulted in the highest leaf area per plant, leaf area index, grains per panicle and grain yield among all row spacing treatments. For the same rowing space, although the density of 135 000 plants/hm ² had higher yield but it was not significantly different from the density of 105 000 plants/hm ². The density of 45 000 plants/hm ² significantly increased grains per panicle, which was 1.8-2.0 times those of 105 000 and 135 000 plants/hm ², its yield was 72%-88% of the highest yield for the same rowing space. This implies that Jinnuo 3 has a strong ability to regulate the population by rowing space of 50cm, N absorption after anthesis stage was significantly higher with the density of 45 000 plants/hm ². Perhaps this explains the reason for the relatively high yield when such low density was employed. Both row spacing of 50cm and 60cm with densities of 105 000 and 135 000 plants/hm ² had a similar high yield. Rowing space of 50cm with the density of 105 000-135 000 plants/hm ² was recommended since it had a higher NPK absorption compared with that of 60cm rowing space.