西芹菜营养元素吸收规律的研究

NUTRIENT ABSORPTION BY WESTERN CELERY(APIUM GRA VEOLENS VAR.DULCE(MILLER)PERS)

本试验研究了西芹菜对 N、P、K、Ca、Mg 的吸收规律。单株 N、P、K、Ca、Mg 吸收量分别为3.87、0.93、3.25、2.82、0.46g,其比例为8.3:2.0:6.9:6.0:1.0。N、K、Ca 吸收量迅速增加的转折期都在发棵和产品形成期的开始,此时为施肥关键期。西芹菜刚长成叶子的叶柄中 NO_3-N 含量与植株全 N 含量相关系数为0.784,达极显著水平。叶片 N、Ca、Mg、P 含量较高,而叶柄 K 含量较高。最后根据产量可计算出单位面积各元素吸收量。

The quantity of N,P,K,Ca and Mg absorbed by a single plant of western celery was 3.87,0.93,3.25,2.82 and 0.46g with ratio being 8.3∶2.0∶6.9∶6.0∶1.0,respectively.The absorption of N,K,Ca increased rapidly when plants entered into the thriving growing stage.So this stage was the key time Of fertilizer application.The NO_3-N content in the petiole had significant correlation with that in the whole plant(r=0.784).The leaf blade con- tained more N,P,Ca and Mg than the petiole,but the latter contained more K.Absorbed amount of each element per unit can be calculated according to yield.