氮、磷、钾失调对“苏州青”青菜生长的影响

The Study of Effect on Nitrogen,Phosphorus and Potassium Deficiency and Excess on the Growth of Brassica chinensis L.cv.Suzhou

以"苏州青"为试验材料,采用室内盆栽砂培方法,营养液按霍格兰配方进行配置,研究氮、磷、钾失调对其生长的影响。结果表明:不同养分处理对"苏州青"青菜的出苗、株高、根长、叶片数、叶长、叶宽等形态指标及地上部和根系鲜重均有不同程度的影响,缺磷和缺钾会明显降低"苏州青"的出苗率,氮过剩对出苗的抑制作用最为明显。除缺氮促使植株根系伸长外,缺氮、缺磷和氮过剩处理均使"苏州青"各形态指标数值有所降低。磷过剩、钾过剩及养分完全处理的地上部鲜重显著高于缺氮、缺磷、缺钾和氮过剩。氮过剩、磷过剩、钾过剩及完全处理地下部鲜重显著高于缺氮、缺磷、缺钾处理,氮过剩、磷过剩、钾过剩、完全处理之间根系鲜重差别不显著,缺氮、缺磷、缺钾处理之间的根系鲜重差别也未达到显著水平。

An indoor sand culture pot experiment with Hoagland＇s solution was carried out to study the effect of nitrogen, phosphorus and potassium deficiency and excess on the growth of cv. Suzhou. The results showed that different treatments all had effects on seed sprouting, plant height, root length , leaf number , leaf length, leaf width,aerial part and root fresh weight of cv. Suzhou. Phosphorus and potassium deficiency significantly reduced the seed sprouting of cv. Suzhou and the inhibition was the most significant in nitrogen excess condition. Except the root elongation with nitrogen deficiency treatment, plant morphological indexs were decreased with nitrogen deficiency, phosphorus deficiency and nitrogen excess treatment, aerial part fresh weight with phosphorus excess, potassium excess and whole nutrition treatments were significantly higher than the treatments such as nitrogen deficiency, phosphorus deficiency, potassium deficiency and nitrogen excess. Root fresh weight with nitrogen excess, phosphorus excess, potassium excess and whole nutrition treatments were significantly higher than the treatments such as nitrogen deficiency, phosphorus deficiency and potassium deficiency. The root fresh weight was not significant compared between nitrogen excess, phosphorus excess, potassium excess and whole nutrition treatments, and the root fresh weight was also not significant compared between nitrogen deficiency, phosphorus deficiency and potassium deficiency treatments.