[Effect of Nutrient Regulation and Control on Cd Accumulation Efficiency of Under Field Conditions].

A field experiment with an orthogonally designed experiment L9(3) was designed to investigate the effect of different N, P, and K levels on plant growth and Cd uptake by . The results showed that the biomass of significantly increased with the N application rate. The highest dry weight in the shoot occurred in the treatments with a high level of N (337.5 kg ·hm), which was 0.86-2.00 times higher than the value with no fertilizer treatment. The addition of K contributed to promoting the Cd absorption of , while no effect was observed when N and P were added. Consequently, NPK fertilizers contribute to increasing the Cd uptake of , and the N and K fertilizer play important role in plant growth and Cd absorption respectively. Moreover, the effect of fertilizers on Cd uptake of was in the order of N > K > P, which indicated that N fertilizer was the main factor for promoting the Cd phytoextraction efficiency of by increasing the biomass. Therefore, the application of high levels of N combined with moderate levels of P and K will be an effective approach to improve the Cd phytoremediation efficiency of by promoting its growth, and the Cd uptake can be increased by a factor of 0.9-2.2 compared to no fertilizer treatment condition.