芦笋秋留母茎光合速率及氮、磷、钾含量的变化

Changes Photosynthetic Rate and the Contents of Nitrogen,Phosphorus,and Potassium in Asparagus officinalis Ratoon in Autumn

芦笋秋留母茎在秋季气温不断下降的条件下生长.在日均气温高于15℃前,拟叶叶绿素含量不断增加,11月中旬以后迅速下降。拟叶光合速率和光合同化产物的积累在日均气温21℃时最高,且植株上中下不同部位拟叶的光合速率变化有明显差异;日均气温10℃为植株生长的最低温度.整个生育期植株氮、磷、钾含量为前期高后期低,钾的含量高于一般农作物,最高时为6.27％.芦笋秋留母茎冬季清园时间可从1月份提早到12月中旬,并注意钾肥的施用.

The ratooning of Asparagus officinalis cv. Mary Washington 800 in autumn was under the condition in which the temperature was getting low. Its' content of chlorophyll had been increasing until the mean daily tem- peratuer reached 15℃,and rapidly decreased after the middle of November. The photosynthenic rate and accu- mulation of assimilates got to maximum at 21℃, and changes of photosynthetic rate were significantly different among leaves of various parts of plant. The minimum mean daily temperature for plant growing was 10℃, Dur- ing all growth stage,the contents of nitrogen, phosphorus, and potassium in early stage were higher than that in late stage, and the content of potassium was higher than general field crops, its maximum was 6.07%. It is pro- posed that the time for cleaning garden in winter of Asparagus officinalis may be moved up from next January to the middle of December, and more attention shoud be paid to the application of potassium fertilizer.