The pot experiment was carried out in this study to further explore the impact of plant nutrient, slaked lime, pokeberry root powder on cadmium （Cd） absorption by rice, and to screen practical agronomic measures whi...The pot experiment was carried out in this study to further explore the impact of plant nutrient, slaked lime, pokeberry root powder on cadmium （Cd） absorption by rice, and to screen practical agronomic measures which could reduce the accumulation of cadmium. In the control treatment nothing but water was sprayed into rice, while in other treatments, plant nutrient, slaked lime and pokeberry root powder were sprayed on rice at the tillering stage, the heading stage and the dough stage, respectively. The plant samples and soil samples were collected after the harvest and then analyzed on aimed indexes. The results showed that Cd contents in rice plants were significantly decreased, total Cd contents in brown rice were significantly （P〈0.05） decreased after rice was sprayed with plant nutrient, slaked lime and pokeberry root powder at different growing stages. However, while rice was sprayed with the three materials all at the tillering stage, the heading stage and the dough stage, the total Cd contents in brown rice were decreased by a maximum reduction that was 53.4% to 57.5% below that of the control, which was signifcantly （P〈0.05） lower than other treatments. Meanwhile, the biggest reduction of Cd inrice sprayed with the three materials at the tillering stage was 19.6% to 35.1% below that of the control, which was signifcantly （P〈0.05） lower than other treatments. In conclusion, spraying plant nutrient, slaked lime and pokeberry root powder on rice at different growing stages could not only reduce the absorption accumulation of Cd by root system, but also change the activities of rice and physical and chemical properties of soil, and then inhibit the absorption of Cd by the root system and the transfer of Cd in the rice plant. Therefore, the multiple factors may be the main causes of reducing Cd contents in the brown rice when the three materials are sprayed on rice at different growing stages.展开更多
Dunuo 201, a new sorghum combination, was planted in heavy metal contaminated areas to explore the feasibility of sorghum for soil heavy metals remediation in southern China. Its yield and heavy metal contents in stem...Dunuo 201, a new sorghum combination, was planted in heavy metal contaminated areas to explore the feasibility of sorghum for soil heavy metals remediation in southern China. Its yield and heavy metal contents in stems, leaves and grains were analyzed. The results showed that Dunuo 201 could accumulate heavy metals especially in stems and leaves without significant effects on its yield. The cadmium content in grains and brewed liquor of Dunuo 201 was lower than the national standard. Therefore, Dunuo 201 can be used in planting structure adjustment in heavy metal contaminated areas in southern China, which has positive significance for the rapid remediation of heavy metal contaminated soil and the improvement of farmers’ economic benefits.展开更多
文摘The pot experiment was carried out in this study to further explore the impact of plant nutrient, slaked lime, pokeberry root powder on cadmium （Cd） absorption by rice, and to screen practical agronomic measures which could reduce the accumulation of cadmium. In the control treatment nothing but water was sprayed into rice, while in other treatments, plant nutrient, slaked lime and pokeberry root powder were sprayed on rice at the tillering stage, the heading stage and the dough stage, respectively. The plant samples and soil samples were collected after the harvest and then analyzed on aimed indexes. The results showed that Cd contents in rice plants were significantly decreased, total Cd contents in brown rice were significantly （P〈0.05） decreased after rice was sprayed with plant nutrient, slaked lime and pokeberry root powder at different growing stages. However, while rice was sprayed with the three materials all at the tillering stage, the heading stage and the dough stage, the total Cd contents in brown rice were decreased by a maximum reduction that was 53.4% to 57.5% below that of the control, which was signifcantly （P〈0.05） lower than other treatments. Meanwhile, the biggest reduction of Cd inrice sprayed with the three materials at the tillering stage was 19.6% to 35.1% below that of the control, which was signifcantly （P〈0.05） lower than other treatments. In conclusion, spraying plant nutrient, slaked lime and pokeberry root powder on rice at different growing stages could not only reduce the absorption accumulation of Cd by root system, but also change the activities of rice and physical and chemical properties of soil, and then inhibit the absorption of Cd by the root system and the transfer of Cd in the rice plant. Therefore, the multiple factors may be the main causes of reducing Cd contents in the brown rice when the three materials are sprayed on rice at different growing stages.
文摘Dunuo 201, a new sorghum combination, was planted in heavy metal contaminated areas to explore the feasibility of sorghum for soil heavy metals remediation in southern China. Its yield and heavy metal contents in stems, leaves and grains were analyzed. The results showed that Dunuo 201 could accumulate heavy metals especially in stems and leaves without significant effects on its yield. The cadmium content in grains and brewed liquor of Dunuo 201 was lower than the national standard. Therefore, Dunuo 201 can be used in planting structure adjustment in heavy metal contaminated areas in southern China, which has positive significance for the rapid remediation of heavy metal contaminated soil and the improvement of farmers’ economic benefits.
