Selenium Biofortification of Lettuce Plants (Lactuca sativa L.) as Affected by Se Species, Se Rate, and a Biochar Co-Application in a Calcareous Soil

Agronomy

Dimitrios Kalderis¹  Ioannis Zafeiriou²  Ioannis Massas²  Dafni Ioannou²  Dionisios Gasparatos² 

[1] Department of Electronic Engineering, School of Engineering, Hellenic Mediterranean University, 73100 Chania, Greece;Laboratory of Soil Science and Agricultural Chemistry, Department of Natural Resources Management & Agricultural Engineering, School of Environment & Agricultural Engineering, Agricultural University of Athens, 11855 Athens, Greece;

关键词: selenate;    selenite;    calcareous soil;    biochar;    lettuce;   

DOI  :  10.3390/agronomy12010131

来源: DOAJ

【 摘 要 】

Selenium biofortification of lettuce plants was studied for two rates (5 and 10 mg kg⁻¹ soil) of either selenate or selenite and for the effect of 5% w/w biochar addition. Lettuce seedlings were grown in pots containing 1 kg of a calcareous soil. Twelve weeks later, the plants were harvested and selenium (Se), phosphorus (P), and sulfur (S) concentrations were determined in heads and roots. Plant growth characteristics were measured and plant biometrics were assessed by NDVI, NDRE, and SPAD measurements. The highest Se concentration of 315.19 mg kg⁻¹ D.W. and the highest amount of Se taken up by plants (950.5 μg/pot) were observed for the low selenate rate with biochar. The corresponding values for selenite treatments were an order of magnitude lower. Although in general, minor to severe toxicity symptoms occurred with selenium application in no biochar treatments (except selenite low rate), the addition of biochar secured plant growth and increased S and P concentrations in plants, regulating Se uptake by plants at high selenite rate and allowing maximum plant uptake at the low selenate rate. To propose an appropriate Se fertilization rate, the fate of excess selenates in the soil environment should be examined and experimentation under soil conditions is necessary.

【 授权许可】

Unknown