不同磷素水平对番茄生长及养分吸收的影响

为了探究不同磷素水平对番茄生长及养分吸收的影响,设置4个(0、0.165、0.660、3.300 mmol/L H2PO4-)不同溶度的磷素水平,采用水培的方法进行试验研究。结果表明:缺磷、低磷、高磷都会影响番茄生物量的积累;缺磷使番茄叶片POD、MDA、相对电导率显著提高,植株矮小、瘦弱,叶小且叶色变成紫红色,出现明显的磷素缺乏症状;随着磷供给的增加,番茄根茎叶的磷含量不断增加,低磷使磷素向地上部的转移比例增加,高磷增加了磷在根中的累积;低磷显著影响番茄对K、Ca的吸收;高磷影响K、Ca、Mg向地上部运转。

Effect of Phosphorus on Growth and Nutrient Uptake of Tomato

In order to study the effect of phosphorus supply on growth and nutrient uptake of tomato (Lycopersicon esculentum Mill), four phosphorus application levels (0, 0.165, 0.660 and 3.300 mmol/L H2PO4-) were conducted in this study by water planting. The results indicated that the tomato biomass was affected by phosphorus deficiency, low phosphorus and high phosphorus; POD, MDA and relative conductivity of leaf were significantly increased in phosphorus deficiency treatment, and the plant was small and thin, the leaf color changed to purple, which showed obvious phosphorus deficiency symptom. The P content in root, stem and leaf of tomato increased with the increase of phosphorus application level, low phosphorus increased the transfer ratio of phosphorus to the ground, and high phosphorus increased P accumulation in the root; K and Ca uptake of tomato were significantly reduced in low phosphorus treatment, the transportation of root K, Ca and Mg to ground was affected by high phosphorus treatment.