氮素供应水平对蔬菜硝酸盐累积与分布的影响

采用蛭石培养试验,研究了不同牮氮水平对蔬菜硝酸盐累积和分布的影响。结果表明,油白菜和大青菜的硝酸盐含量明显高于日本超能菠菜和宁夏圆叶菠菜;油白菜、大青菜和宁夏圆叶菠菜体中,叶柄的硝酸盐含量最高,也是累积硝酸盐的主要分布部位,侧奶、叶片和叶柄则依次是日本超能菠菜在低、中、高氮水平下到盐含量最高和主要分布部位;随供水平提高４种蔬菜的主根、侧极、茎、叶酴 叶片的硝酸盐含量明显提高,油白菜、大青菜和宁夏回

Influence of Nitrogen Rates on Nitrate Accumulation and Distribution in Vegetables

In this paper, the influence of nitrogen rates on nitrate accumulation and distribution in four vegetables was studied through pot experiment. The results showed that nitrate concentrations in cabbage and garden sass are apparently higher than that of two kinds of spinach. Petiole is an organ in which nitrate concentration is the highest and accumulated nitrate of plant is mainly distributed for cabbage, garden sass and Ningxia spinach. Lateral root, blade and petiole are separately the organ in which nitrate concentration is the highest and accumulated nitrate of plant is mainly distributed under the low, medium and high nitrogen levels for Japanese spinach. With the increase of nitrogen rate, nitrate concentrations of different organs all significantly increase for four kinds of vegetable. The distribution percent of accumulated nitrate increase in blade and trend to decrease in main root and lateral root for cabbage, garden sass and Ningxia spinach as nitrogen rate increased, but this percent gradually decrease in main root and stem for Japanese spinach.