Abstract
To study the effects of hyper-accumulator plant straw on the biomass and cadmium (Cd) accumulation of lettuce (Lactuca sativa), the pot experiments were conducted to study the effects of straw application of three hyper-accumulator plants (Solanum nigrum, Bidens pilosa and Galinsoga parviflora) on the biomass and Cd accumulation of lettuce under Cd stress. The results show that: compared with no straw application, the biomass of lettuce was increased after applying three kinds of hyper-accumulator plant straw: S. nigrum, B. pilosa and G. parviflora, Cd content in the above ground part of lettuce was increased by 4.46%, 1.20% and 0.63% respectively, compared with that of non-application, and Cd content in the root of lettuce was decreased. The application of three kinds of hyperaccumulator plant straw promoted the growth of lettuce and increased Cd uptake by lettuce of aerial part.
Highlights
Straw returning is an effective ecological agricultural measure, and straw will release organic matter, nitrogen, phosphorus, potassium and other nutrients after decomposition, and can improve the physical and chemical properties of soil, enhance the activity of biological and most enzymes, and promote the growth and development of stubble crops and increase yield [1,2]
The shoot fresh weight of lettuce with application S. nigrum straw, B. pilosa straw and G. parviflora straw increased by 18.11% (P < 0.05), 15.31% (P < 0.05) and 21.65% (P < 0.05)
The dry weight of lettuce root increased by 62.50% (P < 0.05), 50.00% (P < 0.05) and 70.83% (P < 0.05) with the application of S. nigrum straw, B. pilosa straw and G. parviflora straw
Summary
Straw returning is an effective ecological agricultural measure, and straw will release organic matter, nitrogen, phosphorus, potassium and other nutrients after decomposition, and can improve the physical and chemical properties of soil, enhance the activity of biological and most enzymes, and promote the growth and development of stubble crops and increase yield [1,2]. Bidens pilosa and Galinsoga parviflora are common hyperaccumulator plants in farmland, which have the characteristics of wide source, convenient collection, large number and wide distribution. This experiment explored the effects of application of hyperaccumulator plant straw on the growth and Cd accumulation of lettuce under Cd pollution conditions, and provided reference for the safe production of lettuce in the future
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