TITLE:
Dynamics of Soil NH+4-N and NO-3-N in Rubber Plantation in Wenchang, South China
AUTHORS:
Dongling Qi, Chuan Yang, Zimin Li, Qing Chen, Zhixiang Wu
KEYWORDS:
Rubber Tree (Hevea brasiliensis), Soil NH+4-N, soil NO-3-N, Wenchang, Correlation
JOURNAL NAME:
Agricultural Sciences,
Vol.11 No.8,
August
7,
2020
ABSTRACT: In this study, the dynamics of soil available nitrogen in rubber plantations was
studied to provide a basis for the sustainable management of soil nutrients in
rubber plantations. Soil samples were collected from 0 - 20 cm and 21 - 40 cm
depth of rubber plantations in Wenchang area of Hainan Province to determine
the soil ammonium nitrogen and nitrate nitrogen in March, June, September and
December. The results showed that the total available nitrogen in the rubber
plantation soil was mainly composed of nitrate nitrogen (>57%), and this nitrate
nitrogen was always the absolute composition advantage in the total available
nitrogen composition, and this composition advantage did not change with the
change of soil depth. Nitrate and ammonium nitrogen in rubber plantation soil
showed obvious seasonal variation characteristics in 0 - 20 cm soil layer and
21 - 40 cm soil depth. With the seasonal time change, the contents of soil
nitrate and ammonium nitrogen increased first and then decreased. Summer and
autumn were the most active periods of soil nitrate and ammonium nitrogen.
There was a significant positive correlation between soil nitrate nitrogen
content and ammonium nitrogen content (r = 0.6532**). Based on the correlation between soil ammonium nitrogen content and
nitrate nitrogen content, the content of ammonium nitrogen in soil can be
estimated according to the amount of soil nitrate nitrogen.