水磷耦合对夏玉米生长发育的影响

采用桶栽试验,利用称重法控制水分,在水磷耦合条件下对夏玉米拔节期和成熟期的干物质积累分配以及土壤全磷、水分利用率进行了研究。结果表明,水磷因子对夏玉米的生长发育均有很大影响,且水分因子影响相对较大。在不同的生育期同一磷素供应水平下,不同的供水方式之间存在明显差异,水分供应充足时,通常具有较高的干物质积累。在同样的供水条件下,施磷也能促进干物质的积累,提高夏玉米生育后期根/冠比,进而有利于夏玉米生育后期养分吸收与运转。同时,施磷能够提高夏玉米水分利用率,起到节水增产的目的,达到以肥调水的效果。

The Couple Effect of Water and Phosphorus on Maize Growth and Development in Main Growing Stage

The couple effect of water and phosphorus on dry matter accumulation in elongation stage and maturity stage of summer maize,total phosphorus in soil,and water use efficiency was studied under the pot experiment conditions, and water was controlled using weighing method in whole maize growth season.Results showed that both water and phosphorus,especially for water factor,had important actions on maize growth and development.In the same supply of phosphorus,there were obvious differences among different water supply that relative higher dry matter accumulation was found when water was well-supplied.Moreover,in the same water supply conditions,phosphorus application could also promote dry matter accumulation into maize organs and could decrease ratios of top boot,which may make for absorption and transfer of nutrient elements.In addition,phosphorus application could increase water use efficiency of summer maize to carry out the aim of water-saving and yield-increasing and to achieve the effect of utilizing water by fertilizer.