Figure 1.
Yield of the edible parts of four crops grown in monoculture and mixture with Japanese clover, soybean and cowpea.
Values are means (± SE) of four replicate plots. For each crop, values with asterisk (*) are significantly different (LSD at P<0.05).
Figure 2.
Cd concentrations in the edible parts (A) and shoots (B) of four crops grown in monoculture and mixture with Japanese clover, soybean and cowpea.
The lower and upper horizontal lines indicate the Cd MPC for fruit-type and leafy vegetables, respectively. Values are means (± SE) of four replicate plots. For each crop, values with asterisk (*) are significantly different (LSD at P<0.05).
Figure 3.
Cd concentrations in edible parts (A) and shoots (B) of five maize genotypes grown under monoculture and mixture.
V1 (Zhengdan-958), V2 (Suyunuo-2), V3 (Huyunuo-2), V4 (Jinzhumichaotian), V5 (Shentian-1) indicate the different maize genotypes. The horizontal line indicates the Cd MPC for maize. Values are means (±SE) of four replications. Values with asterisk (*) are significantly different (LSD at P<0.05).
Figure 4.
Soil pH (A) and Cd concentrations of exchangeable form (B) in soil grown under monoculture and intercropping.
Mono.: crop monoculture. Mix.1: co-planted with Japanese clover. Mix. 2: co-planted with soybean. Mix.3: co-planted with cowpea. Values are means (±SE) of four replications. Values with different letters are significantly different (LSD at P<0.05).
Figure 5.
Yellow dot refers to the test crop plant; blue dot refers to the interplanted legume plant. For maize and tomato, row space and distance between plants within row were 45 cm and 30 cm respectively; for cabbage and pakchoi, row space and distance between plants within row were 35 cm and 20 cm respectively.