Abstract:

A randomized block trial was conducted to study the effects of single application of selenium-containing organic fertilizer (C1), single application of foliar selenium fertilizer (C2), mixed application of selenium-containing organic fertilizer and foliar selenium fertilizer (C3) on the yield and quality of Pueraria thomsonii Benth and the absorption and transfer of selenium in different organs of the plant. No selenium fertilizer application was taken as the control (CK). The results showed that the selenium content of various organs of P. thomsonii Benth had no significant increase under treatment C1. The selenium content of root tuber under treatment C2 was 71.0% higher than that under treatment C1, while the selenium content of root tuber under treatment C3 was 110.1% higher than that under treatment C1. The leaf/root tuber transport coefficient of treatment C2 was 902.9% higher than that of treatment C1, which indicated that a large amount of selenium was transported from leaves to roots. The root tuber yield and selenium accumulation amount of P. thomsonii Benth treated with C2 and C3 were significantly higher than those treated with control and C1. Treatment C1, C2 and C3 could increase the puerarin content of P. thomsonii Benth, but there was no significant difference among different selenium application methods. To sum up, for P. thomsonii Benth, the overall effect of single application of foliar selenium fertilizer on improving the yield, quality and selenium accumulation of P. thomsonii Benth was better than that of selenium-containing organic fertilizer. The foliar regulation mode could transfer more selenium to the underground part of P. thomsonii Benth, while the mixed application of selenium-containing organic fertilizer and foliar selenium fertilizer could promote the absorption and accumulation of selenium in the root tubers of P. thomsonii Benth.

Key words: Pueraria thomsonii Benth, selenium, distribution, selenium-containing organic fertilizer, foliar selenium fertilizer