Water and Nitrogen Distribution in Soil Irrigated&Fertigated from a Water Storage Pit
LI Jingling
CHEN Pan
SUN Xihuan
MA Juanjuan
Abstract：Harvesting rainfall using pits for irrigation has become increasingly popular in northwestern China. In this paper we investigated the movement of water and nitrogen in soil under irrigation and fertilization from a wa-ter storage tank in laboratory at 30℃. The tank was a cylindrical wedge-shaped plexiglass with radius of 100 cm and height of 120, approximately twelfth of the storage pit used in the field. The results showed that the water was mainly within 20~60 cm depth of the soil and the soil surface was relatively dry. The infiltration of water from the pit into the soil took place in the first nine days, and water redistribution occurred mainly downwards. Ammonia volatilized mainly at the soil-pit interface, accounting for 72.41%of the total volatilization.The maximum daily ammonia volatilization was 34.08 mg/(m2 · d), peaking seven days after the infiltration. The ammonium was main-ly found in 30~60 cm depth of the soil, increasing monotonically in the first nine days and then decreasing from 15 days after the infiltration started. The nitrate was found in the wetting front, increasing from Day 1 to Day 15 af-ter the infiltration started. In summary, irrigation and fertilization from the water storage pit increased water con-tent and ammonium within the soil in the depth of 30 cm to 60 cm, decreased surface ammonia volatilization, and enhanced nitrification in soil in the depth of 90 cm to 100 cm.
Keywords：water storage pit irrigationfertilizer solution infiltrationsoil water and nitrogen transportammonia volatilization
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 56-61 )