Nitrate leaching from a winter wheat/ summer maize rotation in Beijing Area
Received date: 2002-01-16
Revised date: 2002-05-29
Online published: 2002-08-15
This study was conducted to compare NO 3-N cumulation and leaching from a winter wheat/ summer maize rotation under four applied N fertilizer rates of 0,120, 240, and 360 kgN/ha.An array of 7 zero-tension lysimeters installed at 20,40,60,80,100,140, and 200cm below the soil surface in each plot was used to examine NO 3-N leaching; two disturbed soil cores were stalled, one for contrast, the other fertilized with applied N fertilizer rate of 240 kg/ha, to study leacheate and NO 3-N leacheate flux. Soil sampling performed before and after cultivation revealed that contant of soil NO 3-N in unfertilized plots decreased; and N fertilizer applied plots resulted in NO 3-N cumulation in soil of 0～100 cm; but only the fertilized rate of 360 kg/ha could maintain a constant amount of NO 3-N in soil of 100～200 cm. Average cumulative NO 3-N fluxes through the interface of 200cm below the soil surface at four N fertilizer applied rates were 0.18 , 2.41, 5.52 and 17.12 kg/ha; surface percentages of N leaching were 1.24%,1.48% and 3.14% for each fertilized treatment. The findings are beneficial to the determination of economical optimum N rate and the understanding of the potential role of N fertilizer that affects water quality.
HUANG Man-xiang, ZHANG Shen, ZHANG Guo-liang . Nitrate leaching from a winter wheat/ summer maize rotation in Beijing Area[J]. GEOGRAPHICAL RESEARCH, 2002 , 21(4) : 425 -433 . DOI: 10.11821/yj2002040004
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