不同磷效率大豆基因型苗期吸收氮磷钾的差异

选用磷低效大豆基因型D03、D05、D17和D18及磷高效大豆基因型D31、D34、D37和D38,采用土培试验,设高（＋P）、低磷（-P）2个处理,分析了不同磷效率大豆苗期吸收氮磷钾的差异。结果表明,（-P）处理下,不同磷高效率大豆基因型根茎叶吸磷量有所不同,根茎叶的干重与吸磷量呈显著或极显著正相关,与磷利用效率呈负相关,但未达到显著水平,根、茎和叶的吸氮量和吸钾量均呈下降趋势。低磷胁迫下,抑制大豆苗期植株对氮磷钾的吸收,但磷高效大豆基因型对低磷胁迫的适应能力明显高于磷低效基因型。

Difference in Absorption of N,P and K among Different-Phosphorus Efficiency Soybean Genotypes at the Seedling Stage

The low-phosphorus efficiency soybean genotypes, D03, D05, D17 and D18, and the high-phosphorus efficiency soybean genotypes, D31, D34, D37 and D38 were selected. The soil culture experiment was conducted. There were 2 treat- ments, high phosphorus （＋P） and low phosphorus （-P）. The difference in absorption of N, P and K among different-phosphorus efficiency soybean genotypes at the seedling stage was analyzed. The results showed in the low phosphorus （-P） treat- ment, the P absorption amount differed among roots, stems and leaves of different high-phosphorus efficiency genotypes. The P absorption amount was positively relat- ed （P〈0.05, P〈0.01） to the dry weights of root, stem and leaves, but was negative- ly related to the utilization efficiency of phosphorus （P〉0.05）. The N and K absorp- tion amounts of root, stem and leaves all trended to decrease. The low phosphorus stress would inhibit the absorption of N, P and K in soybean plants at the seedling stage. However, the adaptability of the high-phosphorus efficiency soybean geno- types to low phosphorus stress was significantly higher than that of low-phosphorus efficiency genotypes.