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以两类不同磷效率基因型大豆(磷高效品种锦豆33和辽豆13,磷低效品种铁丰3号和锦8-14)为试验材料,设3个磷浓度用量(0,82.5,165 kg·hm-2),测定大豆根系氮、磷和钾的百分含量和积累量,考察磷素对不同类型大豆根系养分吸收特性的影响和磷高效基因型大豆根系N、P、K吸收动态特征。结果表明:在低磷处理下,鼓粒期和始熟期磷高效品种根系氮的百分含量显著高于磷低效品种;除分枝期外其它生育时期磷高效品种的根系磷的百分含量均高于磷低效品种的,平均高41.4%;整个生育期磷高效品种根系钾的百分含量均高于磷低效品种的,平均高84.8%。磷高效品种的磷和钾的积累量也均高于磷低效品种的(平均高73.3.7%和122.9%)。与低磷相比,中磷和高磷处理能显著增加磷低效品种的根系氮、磷和钾的积累量,而磷高效品种则相对变化较小,即使在较低的磷浓度下其根系也能吸收较多的氮、磷和钾。
Two types of soybean with different P-efficiency genotypes (Phosphorus-efficient cultivars, Jindou 33 and Liaodou 13, and Phosphorus inefficient cultivars Tiefeng 3 and Jin 8-14) were used as experimental materials. Three phosphorus concentrations (0, 82.5, 165 kg · hm-2). The effects of phosphorus on the nutrient uptake characteristics of different types of soybean roots and the N, P, K uptake of soybean with high P genotype were studied Dynamic features. The results showed that under low phosphorus treatments, the percentage of nitrogen in roots of phosphorus-efficient cultivars was significantly higher than that in phosphorus-inefficient cultivars at the boll stage and the initial ripening stage. The percentages of phosphorus in roots of other phosphorus-efficient cultivars except for the branching stage The average content was 41.4%. The percentage of potassium in roots of high-phosphorus-efficient cultivars was higher than that of low-phosphorus cultivars, with an average high of 84.8%. Phosphorus and potassium accumulation of phosphorus efficient varieties were also higher than phosphorus inefficient varieties (average high 73.3.7% and 122.9%). Compared with the low phosphorus, medium phosphorus and high phosphorus treatments could significantly increase the accumulation of nitrogen, phosphorus and potassium in the phosphorus inefficient cultivars, while the relatively high phosphorus cultivars changed relatively less, even at lower phosphorus concentrations Also absorb more nitrogen, phosphorus and potassium.