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Position: Home > Articles > Downward movement and leaching of NO_3~--N from nitrogen-fertilized corn on dryland soil Pedosphere 1998,8 (1)

Downward movement and leaching of NO_3~--N from nitrogen-fertilized corn on dryland soil

作  者:
FU GAOMING;YUAN FENGMING;YAO ZAOHUA
单  位:
Soil and Fertilizer Institute, Chinese Academy of Agricultural Sciences, Beijing 100081 (China);angeaSystems.com
关键词:
corn;groundwater;leaching;no_3~--n;soil profile
摘  要:
Field lysimeter method was employed to investigate the downward movement and leaching of N applied to summer corn (Zea may L.) on dryland soil in Beijing. A N-fertilizer (120 kg N hm~(-2)) and a control treatment were arranged for the study. Soil solution was collected at depths of 20, 40, 60, 120 and 170 em, while leachate was collected at the bottom (200 cm) of the lysimeter. The results showed that the downward movement of NO_3~--N in soil profile was greatly affected by rainfall pattern. The peak of leached NO_3~--N from both treatments coincided with the peak of the rainfall. In addition, leached NO_3~--N from both treatments and rainfall were significantly correlated (P<0.05). The amount of leached NO_3~--N was not great in the N-fertilizer treatment. The results also suggested that N fertilization could cause NO_3~--N contamination of groundwater during the rainy season.

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