Effects Of Organic Acid And EDTA On Yield And Quality Of Rice In Cadmium Polluted Soil

Cadmium pollution become more and more serious and already becomes one of main heavy metal pollution in soil limit rice yield and quality, Cd has enormously affected safe production of rice and the sustainable development of agriculture. This research used pot experiment method, discussed the effects of applying organic acids and EDTA on growth and yield of different rice cultivars in cadmium polluted soil, appraised the influence of added organic acid and EDTA on nutrient absorption, cadmium accumulation as well as quality of rice and so on in cadmium polluted soil. Main results of the research were as follows:(1) In cadmium polluted soil, organic acid and EDTA improved plant height, effective panicle number and panicle setting rate, spikelet number per panicle, ratio of grain via grass of rice and 1000-grain weight of II527 in cadmium polluted soil. Effect of organic acid and EDTA on growth and yield of rice was higher in high cadmium pollution (5.0mg Cd per kg soil) than in low cadmium pollution (1.0mg Cd per kg soil). In cadmium-polluted soil, significant differences were found in effective panicle number, panicle-setting rate, economic factor, ratio of grain via grass and yield by applying organic acid and EDTA due to genotypes difference. Organic acid, organic acid+l/2EDTA improved yield of II527 by 8.3%, the effect of increase was in an order of organic acid>organic acid+1/2EDTA. Organic acid, organic acid+l/2EDTA, EDTA have better effect on Xiushui63 (improved by 68.1%), the effect was in an order of organic acid, organic acid+l/2EDTA>EDTA. Compare the result of two genotypes, organic acid, organic acid+l/2EDTA have significant effect on yield in Cd polluted soil.(2) In Cd polluted soil, activities of POD, CAT reduced, activity of SOD increased in low cadmium polluted soil (l.Omg Cd per kg soil) while significantly decreased in high cadmium polluted soil (5.0mg Cd per kg soil), MDA concentration and dissociate proline concentration increased, concentrations of chlorophyll a, b and soluble protein concentration significantly reduced with cadmium level increasing. Organic acid, EDTA decreased activities of POD, CAT, MDA concentration and increased activity of SOD, dissociate proline concentration, increased soluble protein concentration of rice in high cadmium polluted soil (5.0mg Cd per kg soil), soluble protein concentration of xiushui 63 and chlorophyll a in low cadmium polluted soil (1.0mg Cd per kg soil),...