Interaction effect between phosphorus and selenium on their availability in soil and contents in soybean plants grown on alluvial clayey soil [electronic resource].

Includes references.

A greenhouse trial was carried out using an alluvial clayey composite soil sample as growth media for soybean plants (Giza, 22) to study the interaction effect between P and Se on their availability in soil and contents in soybean plants. The Se was applied at rates of 0, 0.5, 1.0, 5, 10,20 and 40 mg kg-) soil as sodium selenate. Phosphorus was added at rates of 0, 50, 100 and 150 mg kg-! soil as potassium dihydrogen phosphate. During gro\\111 season, the soil samples were taken from rhizosphere area at periods of IS, 30, 45 and 60 days to assess the status of Se and P under rhi7.osphere conditions. The main results revealed that : • The dry matter yield of soy'bean plants was significantly and negatively affected with increasing rates of Se addition, irrespective of P application. Each of 1.0 mg Sc addition over 0 treatment caused a decrease in D.M yield of soybean plants by 0.086 g. In absence of Se application, the dry matter production of soybean plants was positively but insignificantly affected as the rates of phosphorus application increased. • Selenium concentration in soybean plants increased significantly as the application rates of Se and P increased, but this an increase was not significant with P addition. • Either phosphorus or selenium application resulted in a significant increase in P concentration of soybean plants . • Increasing rates of either selenium or phosphorus addition to the soil produced a significant increase in Se- uptake by soybean plants. • P-uptake by soybean plants was significantly but negatively affected with increasing levels of applied Se in absence of P treatments, while application of P to the soil yielded a positive significance correlation with p. uptake by soybean plants. • Soil available Sc was significantly increased as the levels of selenium and phosphorus increased. The highest increase in soil available Se was occurred during the first period of incubation (IS days) where it amounted 35.3 and 1308%, as compared with P0 and Se0 treatments, respectively. However, soil available Se was significantly reduced with prolonging the incubation time,

Summary in Arabic.

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