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通过盆栽试验,研究了不同磷效率水稻在不同pH土壤和不同磷处理水平下的磷营养特性。结果表明,低磷条件下,分蘖期耐低磷基因型850、1574和1079的磷吸收效率最高,孕穗期3个耐低磷品种磷吸收量和利用效率均较高;到成熟期1574品种的相对磷吸收量最高,达到65%,而相对磷利用效率则以1574和850品种最高。不同pH土壤上,分蘖期各水稻品种在碱性土壤七磷吸收量和利用效率最低,相对磷吸收量和相对磷利用效率却最高;耐低磷基因型850、1574和1079的磷吸收量高于鄂晚13和敏感基因型99012。在孕穗期,各水稻品种在碱性土壤上的磷吸收量高于其它两种土壤,但相对磷利用效率却最低;耐低磷基因型850和1574在3种土壤上磷吸收量均最高,成熟期各水稻品种磷利用效率则明显高于孕穗期。可见,不同耐低磷基因型在不同pH土壤上表现出的磷营养特性不同,在耐低磷品种的筛选过程中应该考虑土壤pH因素,生产中应根据不同土壤酸度类型选择合适的品种。
Pot experiments were conducted to study the phosphorus nutrition characteristics of different P-efficient rice plants under different pH and phosphorus treatments. The results showed that the phosphorus uptake efficiency of tillering stage at low tillering stage was the highest at 850, 1574 and 1079, and the phosphorus uptake and utilization efficiency of three low tillering stage cultivars at booting stage were high. The highest relative phosphorus uptake was 65%, while the relative phosphorus utilization efficiency was the highest among 1574 and 850 varieties. The phosphorus uptake and the utilization efficiency of all the rice cultivars in alkaline soil were the lowest at different tillering stage, while the relative phosphorus uptake and the relative phosphorus use efficiency were the highest. The phosphorus uptake by the low phosphorus tolerant genotypes 850, 1574 and 1079 was high Late in E’eh and sensitive genotype 99012. At the booting stage, the phosphorus uptake by all the rice cultivars in alkaline soil was higher than that in the other two soils, but the relative phosphorus use efficiency was the lowest. The phosphorus uptake by the three low-phosphorus-tolerant genotypes 850 and 1574 was the highest, Phosphorus utilization efficiency of all rice cultivars at maturity was significantly higher than that at booting stage. It can be seen that different phosphorus tolerant genotypes have different phosphorus nutrient characteristics in different pH soils. Soil pH factors should be considered in the selection of low phosphorus tolerant cultivars. Appropriate varieties should be selected according to different soil acidity types in production.