磷肥用量对盐地条件下油菜干物质积累和分配的影响

Effects of P Rate on Biomass Accumulation and Partitioning of Canola(Brassica napus L.)in Saline Soil

在江苏沿海滩涂试验田,以秦优10号为试验材料,设置0、30、60、90、120和150 kg/hm^(2)6个磷肥施用量水平,研究盐地条件下磷肥用量对油菜各时期干物质积累和分配的影响。结果表明,施用磷肥能显著增加各个时期不同器官的干物质积累量。其中根系的干物质积累量增加幅度最大。在苗期,施用磷肥显著增加了干物质在根系中的分配比例,但降低了其在叶片中的分配。在初花期,施用磷肥显著增加了干物质在根系和叶片中的分配比例,但降低其在茎秆中的分配。在成熟期,施用磷肥显著增加了干物质在根系和籽粒中的分配比例,降低了其在茎秆和果壳中的分配,说明施磷肥可以促进油菜根系的生长发育,良好的根系发育反之能够促进初花期的叶片生长,最终促进养分向籽粒的运输,从而达到增产的目的。推荐此区域的磷肥用量为120 kg/hm^(2)。

A field experiment was conducted to investigate the effects of P rate(0,30,60,90,120 and 150 kg/hm^(2))on the biomass accumulation and partitioning of canola(Brassica napus L.)in saline soil.The results showed that P supply increased biomass accumulation in all organs at all the growth stages.The root had the most increment among different organs.At seedling stage,P supply increased the biomass partitioning in root but decreased this partitioning in leave.At flowering stage,P supply increased the biomass partitioning in root and leave but decreased these in stem.At maturity stage,P supply increased the biomass partitioning in root and seed but decreased these in stem and shell.These results suggested that P supply improved root growth,and in turn,great root system enhanced the leave development at flowering stage,and finally improved the nutrient transporting to seed,resulting in increased seed yield.We recommended the P fertilizer at the rate of 120 kg/hm^(2)in this saline soil.