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为探索还原态硫对水稻毒害的临界浓度,采用水培试验研究不同还原态硫浓度对水稻干物质累积和氮磷钾吸收的影响。结果表明:随着还原态硫浓度的增加,干物质累积量较空白处理平均下降8.79%~72.32%;当浓度为50mg/L时,氮、磷和钾累积量分别较空白处理增加5.31%、4.67%和6.52%,但当浓度再增加,氮磷钾累积量则逐渐下降,其中,还原态硫浓度为250~300mg/L时,干物质累积量、氮、磷和钾累积量较空白处理显著降低,分别降低67.43%~72.32%、52.36%~62.49%、61.39%~63.90%和61.30%~68.97%。结论:初步确定还原态硫对水稻的毒害临界浓度为250~300mg/L。
In order to explore the critical concentration of reduced sulfur on rice poisoning, hydroponic experiments were conducted to study the effects of different concentrations of reduced sulfur on rice dry matter accumulation and nitrogen, phosphorus and potassium uptake. The results showed that the dry matter accumulation decreased by 8.79% ~ 72.32% on average with the reduction of sulfur concentration. When the concentration was 50 mg / L, the accumulation of nitrogen, phosphorus and potassium increased by 5.31% 4.67% and 6.52% respectively. However, when the concentration was increased, the accumulation of NPK decreased gradually. When the concentration of reduced sulfur was 250 ~ 300 mg / L, the dry matter accumulation, nitrogen, Decreased significantly by 67.43% -72.32%, 52.36% -62.49%, 61.39% -63.90% and 61.30% -68.97% respectively. Conclusion: The critical concentration of reduced sulfur for rice is initially determined to be 250-300 mg / L.