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不同形态氮素替代硝态氮对蔬菜硝酸盐含量变化的影响

DOI: 10.7668/hbnxb.2008.06.047, PP. 208-211

Keywords: 不结球白菜,生菜,氨基酸,尿素,硝酸盐

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Abstract:

水培情况下,收获前12d用甘氨酸、异亮氨酸和脯氨酸的不同组合及尿素替代营养液20%硝态氮,降低了不结球白菜与生菜叶片及叶柄硝酸盐含量,而对产量影响不大。以单一甘氨酸效果最好,甘氨酸、异亮氨酸和脯氨酸三者混合次之,生菜以1次替代,而不结球白菜2次为宜,处理3d后收获;叶片全氮含量显著增加。不结球白菜对尿素的吸收利用效率大于生菜,同化能力强,尿素对体内硝酸盐含量的降低效果与氨基酸无显著差异,而氨基酸对生菜作用大于尿素。

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