不同耐低磷基因型玉米磷营养特性研究

 研究了纳米级和天然高岭土对营养元素氮、磷、钾和有机碳的吸附及解吸特性。结果表明，在相同的初始处理浓度下，纳米级高岭土对氮、磷、钾和有机碳的吸附量均比天然高岭土高，氮的吸附量是天然高岭土的1.5~1.7倍、磷是1.9~2.2倍、钾是1.4~2倍、碳是1.3～1.9倍。纳米级和天然高岭土对氮、磷、钾和有机碳的解吸量与其吸附量呈正相关。2种高岭土对氮、磷、钾和有机碳的吸附规律均可用Langmuir和 Freundlich 方程来拟合。

Phosphorus Nutrient Characteristics of Different Maize Inbreds with Tolerance to Low-P Stress

Nutrient characteristics of phosphorus in different maize inbred lines with tolerance to low-P stress were studied at stages of seedling, jointing ,earing, silking in a pot experiment. In the periods of seedling and jointing P uptake efficiency is the main contributor to P tolerance, and the relative P content in 99180 and 99239 (both are P-tolerant genotypes) are higher than that in 99152 (P-sensitive genotype). At earing stage P-resistant genotypes, compared to P-sensitive ones, have higher accumulation of P in upper leaves. At silking stage, P uptake and reallocation efficiency of P-tolerant genotypes are higher than those in 99152. The results also suggested that there are different mechanisms of P nutrient characteristics even in different P-tolerant genotypes. Inbred line 99239, according to the investigation, is considered as an efficient stock in the P-uptake while 99180 falls to the efficient stock of P reallocation.