|Table of Contents|

Effects of Different N Fertilizer Concentrations on Soil Infiltration Characteristics Under Moistube Irrigation

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2022年15
Page:
81-88
Research Field:
Publishing date:

Info

Title:
Effects of Different N Fertilizer Concentrations on Soil Infiltration Characteristics Under Moistube Irrigation
Author(s):
WANG Ruijun; SHEN Lixia; MENG Han; LI Huimin; SUN Xuelan; LI Jingling
(College of Water Conservancy and Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024)
Keywords:
moistube irrigation; nitrogen fertilizer concentration; infiltration; wet body
PACS:
-
DOI:
10.11937/bfyy.20215232
Abstract:
The clay loam soil was used as the test material，and the soil capacity was 1.30 g?cm-3，the pressure head was 1.5 m，the burial depth of the micro-wet pipe was 15 cm，and the nitrogen fertilizer concentration was 0(control)，300，600，900，1 200 mg?L-1.The water infiltration process under different nitrogen fertilizer concentrations was investigated,in order to obtain the water transport pattern under the fertilization conditions of moistube irrigation and to provide reference for the water-fertilizer integration technology of moistube irrigation.The results showed that compared with the clear water treatment group，the cumulative infiltration rate of the nitrogen fertilizer treatment group increased to different degrees，and the cumulative infiltration rate increased and then decreased with the increase of nitrogen fertilizer concentration，and the inflection point was 900 mg?L-1.The change of the cumulative infiltration rate over time was in accordance with the Kostiakov infiltration model.The initial infiltration rate was correlated with the N fertilizer concentration，and the infiltration rate of 1 200 mg?L-1 treatment group declined the fastest；the N fertilizer concentration had no effect on the shape of the wetted body，and the shape of the wetted body cross-section was approximately elliptical with the micro-wetted tube as the center；the transport distance of the wetted front was the largest in the vertical downward direction，followed by the horizontal right direction，and finally the vertical upward direction；the transport distance of the wetted front in all directions showed a pattern of increasing and then decreasing with the increasing of the N fertilizer concentration；the uniformity of irrigation was high in all treatments.The optimum concentration range was 600-900 mg?L-1 by combining the cumulative infiltration and wetting front transport.

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Last Update: 2022-09-15