Inorganic Nitrogen Leaching from Meadow Brown Rice Field on Lower Liaohe River Plain as Affected by Chemical N Fertilization

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Inorganic Nitrogen Leaching from Meadow Brown Rice Field on Lower Liaohe River Plain as Affected by Chemical N Fertilization

更新时间：2024-11-07

- Inorganic Nitrogen Leaching from Meadow Brown Rice Field on Lower Liaohe River Plain as Affected by Chemical N Fertilization
- Issue 1, Pages: 59-62(2006)
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- Published：2006
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Inorganic Nitrogen Leaching from Meadow Brown Rice Field on Lower Liaohe River Plain as Affected by Chemical N Fertilization[J]. 2006, (1): 59-62.
DOI：

Inorganic Nitrogen Leaching from Meadow Brown Rice Field on Lower Liaohe River Plain as Affected by Chemical N Fertilization[J]. 2006, (1): 59-62. DOI：

摘要

应用陶土渗滤管法．研究了不同施氮和渗漏条件下潮棕壤稻田的氮淋溶损失。结果表明：稻季各次施用氮肥后，60cm和90cm深处渗漏液中NH4^＋-N含量都小于2mg／L。并且各施氮肥处理和对照间差别不显著；但硝酸盐淋溶比较显著，多集中在3～15mg／L之间。硝酸盐淋溶随施氮量增加而增加，90cm深度渗漏液中这一趋势更为明显。水分渗漏状况影响硝酸盐在不同土层深度的累积：渗水越快。硝酸盐淋溶深度越大。渗水较快或者施氮量高时，硝酸盐的淋溶浓度高于国际饮用水卫生标准10mg／L。施用基肥后灌水．NH4^＋ -N、NO3^- -N立即出现高峰．而施用分蘖肥和穗肥后，高峰出现在施肥后10d或更久；另处基肥时期淋溶氮的浓度也比较高。

Abstract

Inorganic nitrogen leaching loss was estimated with porous pottery tube on a rice field at the Shenyang Ecological Experimental Station

Chinese Academy of Sciences.The results obtained could be summarized as follows: The ammonium leaching loss was negligible(< 2 mg/L)after N fertilization

but the leached amount of nitrate was increased with increasing N application rate

being 0.096~21.65 mg/L at 60 cm depth

and 0.87~14.91 mg/L at 90 cm depth.Water penetration rate had a strong effect on nitrate leaching.When the penetration was faster or nitrogen rate was higher

more than 10 mg/L of nitrate(the international sanitation standard of drinking water) was found in the leachate.The peak of ammonium and nitrate leaching loss was appeared soon after basal dressing

but at 10 days or more after tillering or earing stage-topdressing

and the loss amount was also higher after basal dressing.

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