镁水耦合对寒地水稻产量构成因素及产量的影响

在黑龙江庆安水利试验站,以水稻(Oryza sativa L.)龙庆稻3号为试验材料,采用随机区组法,以负压式土壤湿度计监测土壤水势,研究镁水耦合对寒地水稻产量构成因素及产量的影响,以期为节水栽培提供理论依据和技术支持。结果表明,龙庆稻3号的镁肥与水分处理间在穗数、穗粒数、结实率和产量上均存在互作关系;镁肥施用后,龙庆稻3号的穗数增加、穗粒数增加、结实率降低、千粒重降低、理论产量增加;以-15~-20 k Pa为控水下限的水分管理,龙庆稻3号的穗数减少、穗粒数增加、结实率降低、千粒重降低、理论产量增加;以-15~-20 k Pa为控水下限同时施用镁肥的处理,龙庆稻3号的理论产量最高。返青期至成熟期进行-15~-20 k Pa的间歇控水处理,节水率为28.5%。

Effect of Magnesium Fertilizer and Water Coupling on Yield Components and Yield of Rice in Cold Region

In order to provide the theory base and technical support for water-saving cultivation technique,with Longqingdao 3 as material,the effects of magnesium fertilizer and water coupling on yield components and yield of rice in cold region were studied with the random area group experiment by examining soil water potential with a negative pressure soil moisture meter in Qin'an irrigation testing station.Results showed that there were interactions in the number of panicle,grain number per panicle,kernel setting rate and yield of Longqingdao 3 between magnesium fertilizer and water treatments.After application of magnesium fertilizer,the number of panicle,grain number per panicle and yield of Longqingdao 3 increased,and kernel setting rate and 1000-grain weight of Longqingdao 3 decreased.Intermittent controlling water treatments at-15～-20 kPa of soil water potential were carried out from re-green to mature,the number of panicle,kernel setting rate and 1000-grain weigh of Longqingdao 3 decreased,and grain number per panicle and yield of Longqingdao 3 increased.When carrying out intermittent controlling water treatments at-15～-20 kPa of soil water potential from re-green to mature with application of magnesium fertilizer,the yield of Longqingdao 3 was the highest.When carrying out intermittent controlling water treatments at-15～-20 kPa of soil water potential from re-green to mature,the water saving rate was 28.5％.