不同灌溉上限对芥蓝养分吸收和分配的影响

Effects of Different Upper Irrigation Limits on Absorption and Distribution of Nutrient in Chinese Kale

为了明确土壤水分对芥蓝养分吸收利用的影响,基于不同灌溉上限的条件分析土壤水分对芥蓝植株氮、磷、钾、钙、镁的养分吸收量的影响,及其在各器官中含量的变化规律。结果表明,增加土壤水分能促进芥蓝植株各种养分的吸收,其促进作用以Ca>P>N≥K>Mg的顺序排列。氮含量在根和基茎中较少,在基叶、薹叶和薹茎中相对高一半左右,薹叶和基叶的氮含量随着土壤水分增加呈上升趋势,并保持薹叶高于基叶的趋势;薹茎的氮含量则随着土壤水分增加呈相对减少趋势。磷含量在植株各器官基本随着土壤水分增加呈上升趋势,其中薹叶的磷含量上升幅度最大;当植株的磷相对缺乏时则更多向薹茎中转移。基茎的钾含量在土壤水分增加时有较大提高,在其它四个器官保持较平稳的增长的趋势,并按基叶>薹茎>薹叶>根的顺序排列。钙含量在植株各器官相差极大,以基叶中钙含量最高,薹叶中少一半以上,根和基茎中较少,薹茎中极少。镁含量植株基叶中较高,比其他器官高一半左右,土壤水分增加有促进根吸收的镁转移,在基叶、薹叶和薹茎中积累的趋势。土壤水分促进芥蓝养分的吸收和利用,并对芥蓝各器官的养分分配有较大影响。

In order to clarify the influence of soil moisture on the nutrient absorption and utilization of Chinese kale,based on the conditions of different irrigation upper limits,the influence of soil moisture on the nutrient absorption of Chinese kale plants of nitrogen,phosphorus,potassium,calcium,and magnesium,and the content in various organs were analyzed.The results showed that increasing soil moisture could promote the absorption of various nutrients by Chinese kale plants,and the enhancement was arranged in the order of Ca>P>N≥K>Mg.The N contents in root and basal stem were relatively smaller half than those in basal leaf,bolting leaf,and bolt.The N contents of bolting leaf and basal leaf increased with the increment of soil moisture,moreover,the N content of bolting leaf was always higher than that of the basal leaf.The N content of the bolt showed a relatively decreasing trend with the increase of soil moisture.The P content in the plant organs increased with the increment of soil moisture,and the P content of the bolting leaf increased the most;when the plant was relatively deficient in P,it was more transferred to the bolt.The K content of the basal stem increased greatly when the soil moisture increased,and maintained a relatively stable growth trend in the other four organs,and was arranged in the order of basal leaf>bolt>bolting leaf>root.The Ca content varied greatly among plant organs,with the highest Ca content in basal leaf,more than half in bolting leaf,less in root and basal stem,and very few in the bolt.The Mg content in the basal leaf was the highest,about half higher than those in other organs.The increase in soil moisture will promote the transfer of magnesium to the roots and accumulate in the basal leaves,stalk leaves,and stems.Soil moisture promotes the absorption and utilization of kale nutrients and has a greater impact on the nutrient distribution of the various organs of the kale.