| 摘要: |
| 【目的】研究磷肥用量对菘蓝干物质积累及其营养元素吸收的影响。【方法】于2011-05-14，通过大田试验，研究磷肥（P2O5）用量分别为0，90，180，360，540 kg/hm2时，菘蓝干物质累积量以及氮、磷、钾累积吸收量的变化。【结果】在菘蓝生长60～180 d，不同施磷水平下，菘蓝总干物质累积量均随生长期的推进呈现出逐渐增加的变化趋势，即“S”型曲线；磷肥用量在0～180 kg/hm2时，菘蓝总干物质累积量、干物质日增长量、根干物质分配率均随着磷肥用量的增加而提高；当磷肥用量超过180 kg/hm2时，总干物质累积量、干物质日增长量、根干物质分配率反而下降。菘蓝植株的氮、磷、钾吸收累积量动态变化与其干物质积累规律类似，总体均呈“S”型增长趋势。在整个生长期，以磷肥施用量为180 kg/hm2的处理菘蓝植株和根系的氮、磷、钾累积吸收量最高；而当磷肥用量超过180 kg/hm2时，植株和根系的氮、磷、钾素累积吸收量反而下降。菘蓝对氮的吸收量最大，钾次之，磷最少，当磷肥用量达到180 kg/hm2时，菘蓝全生育期对氮、磷、钾素累积吸收量均达到最高值，分别为1 370.22，192.44，682.44 mg/株。【结论】在本试验土壤肥力条件下，磷肥（P2O5）的推荐用量为180 kg/hm2，且是作为基肥一次性施入。 |
| 关键词: 菘蓝 磷肥 干物质 氮磷钾吸收 |
| DOI： |
| 分类号: |
| 基金项目:河北省科技计划项目(11270907D) |
|
| Effects of phosphate fertilizer rate on dry matter accumulation and nutrient absorption of Isatis indigotica Fort. |
|
WEN Chun-xiu,LIU Ling-di,WANG Li-ying,et al
|
| Abstract: |
| 【Objective】The paper studied the effects of phosphate fertilizer on dry matter accumulation and nutrient absorption of Isatis indigotica Fort..【Method】Effects of different P fertilization levels (0,90,180,360,and 540 kg/hm2) on accumulation of dry matter and uptake and accumulation of nitrogen,phosphorus,and potassium of Isatis indigotica were studied through a field experiment from May to November,2011.【Result】In 60 to 180 d of Isatis indigotica growth period,total dry matter accumulation gradually increased with an “S” shape as the advance of growing stage under different phosphorus levels.Total dry matter accumulation,daily dry matter increcement,and root dry matter allocation rate of Isatis indigotica increased as the increase of phosphate amount within 0-180 kg/hm2,while they started to decline when the amount was >180 kg/hm2.N,P and K absorption accumulations changed similarly as dry matter accumulation with the “S” shape.In the whole growth stage,plant,leaf and root of Isatis indigotica had the highest uptake and accumulation of nitrogen,phosphorus,potassium when phosphorus amount was 180 kg/hm2,while they decreased when the amount was >180 kg/hm2.The absorption capacity of N was the highest,followed by K and P.With the phosphate rate of 180 kg/hm2,the highest accumulation amounts of N,P and K in the whole growing period were 1 370.22,192.44,and 682.44 mg/plant,respectively.【Conclusion】The recommended amount of phosphate (P2O5) was 180 kg/hm2 and it should be applied once as base fertilizer. |
| Key words: Isatis indigotica Fort. phosphate (P) dry matter N,P,K absorption |
