不同播量对宁夏引黄灌区直播水稻生育特性及产量的影响

Effects of Different Seeding Rate on Growth Characteristics and Yield of Direct Seeding Rice in Ningxia Yellow River Irrigation Region

以连湖农场主栽水稻(Oryza sativa L.)品种2009G19为材料,在宁夏连湖农场进行10、15、20、25 kg/667 m2的4个播量梯度大田试验,以明确直播水稻播量与生育特性和产量的关系。结果显示,适当降低播量,合理稀植,能显著提高水稻出苗保苗情况,增加水稻叶面积,促进光能的充分利用,增加干物质累积,提高水稻有效穗数、穗粒数和结实率,最终提高产量。其中播量为20 kg/667 m2时水稻产量最高,达到11 167.5 kg/hm2。在该试验条件下,播量为20 kg/667 m2是最适宜播量。

To explore the relationship between the sowing rate of direct seeding rice on its growth characteristics and yield,the experiment was carried out in Lianhu farm using main rice cultivar 2009G19 as material,and the sowing rate were 10,15,20 and 25 kg / 667 m2,respectively. The results showed that appropriate low seeding rate and appropriate thin planting could increase seedling germination and protection rates obviously, dry matter accumulation,effective panicle number,grain number per spike,seed-setting rate and finally the yield. Among all of them,the most suitable sowing rate was 20 kg / 667 m2 and the yield of direct seeding rice reached 11 167.5 kg / hm2 under the condition of this experiment.