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施用氮肥时加入适量的硝化抑制剂(占施氮量的2—3%),能抑制铵态氮转化为硝态氮,从而减少氮肥的损失,延长肥效,提高氮肥的利用率。但是,硝化抑制剂施用后在作物体内和土壤中的残留量有多少?在土壤中的浸透、淋溶、吸附情况怎样?这关系到人畜安全和环境污染问题。我们用~(14)C 标记的 CP[2-氯-6-(三氯甲基)呲啶]、ASU(眯基硫脲)和 DCS(2.5-二甲基琥珀酰胺酸)研究其在水稻“广二安”各器官和土壤中的残留动态及在土壤中的渗透、淋溶、吸附情况。试验结果表明:植株吸收 ASU、DCS 的绝对量在幼穗分化期就达到了高峰,以后随着生长期的延长
Nitrogen fertilization by adding an appropriate amount of nitrification inhibitors (accounting for 2-3% of the amount of nitrogen), can inhibit the conversion of ammonium nitrogen to nitrate nitrogen, thereby reducing the loss of nitrogen fertilizer to extend fertilizer efficiency and improve the utilization of nitrogen fertilizer. However, what is the residual amount of nitrification inhibitor in the crop and the soil after the application? How are the infiltration, leaching and adsorption in the soil? This is related to the safety of human and livestock and the problem of environmental pollution. We studied the effects of C-labeled CP [2-chloro-6- (trichloromethyl) pyridine], ASU (squarylium thiourea) and DCS (2.5-dimethyl succinamic acid) “Guang Er’an ” the residual dynamics in various organs and soil and in the soil infiltration, leaching, adsorption situation. The results showed that the absolute amount of DCS absorbed by ASU plants peaked at the young spike differentiation stage, and then increased with the growth period