Abstract:
Nanotechnology has been widely applied to agricultural fields, but the control of cadmium pollu-tion in agriculture and flower quality improvements are rarely reported. The aim of this study is to provide a new way and scientific basis for the application of nano cadmium-resistant agent (I-V). The results showed that the cadmium reduction rate of rice was 80% and that of rice was much lower than that of national standard under the condition of low cadmium soil (0.42 mg/kg). In the high cadmium soil background (2.549 mg/kg), the rate of cadmium reduction of type II to rice was 20.30%. The results showed that the soil cadmium content was 0.64 mg/kg, and the effect of type II 40 kg/667 m
2 was the best, reaching 20.74%. In the cadmium soil background (4.0 mg/kg), the effect of controlling cadmium of type II 160 kg/667 m
2 was the best, reaching 25.40%. In the soil cadmium content of 2.06 mg/kg, the effect of type IV and V to rice was more than 40%. When the soil cadmium content rose to 2.929 mg/kg, the effect of type IV and V were significantly reduced. The cadmium reduction rate of celery (cadmium background 0.8 mg/kg), eggplant (cadmium background 0.33 mg/kg), greenhouse pepper (1.2 mg/kg cadmium background) and open pepper (0.29 mg/kg cadmium background) were 38.13%, 28.07%, 30.29% and 50% respectively. The effect of reducing the amount of cadmium on the capsaicum type II 80 kg/667m
2 was significantly higher than that of 40 kg/667m
2 and control (a = 0.05). In the soil cadmium background 1.49 mg/kg, III type of Zhejiang long radish reached cadmium reduction rate of 31.08%. Besides, type II and III had significant effect on rice production, and type I had obvious effect on lengthening lily flowering period. We proposed the “VPON” promotion model of nanotechnology cadmium treatment (V: Low cadmium variety; P: Soil pH value; O: Organic fertilizer; N: Nano-ecological cadmium-resistant agent).