Ngome Et Al


Ngome et al

Journal of  Agricultural Sciences

Vol. 3 (6), pp.
451-457, June 2013.

 ISSN: 2276-7770 



Manuscript Number: 030613519


Effects of Cassava Cultivation on Soil Quality
Indicators in the Humid Forest Zone of Cameroon


Ngome Ajebesone Francis*, Amougou Mbatsogo Felix
Constant, Tata Precillia Ijang, Ndindeng Sali Atanga,
Mfopou Mewouo Yvette Clarisse, Mapiemfu-Lamare Delphine, 

 Njeudeng Tenku Simon


Institute of Agricultural Research for
Development (IRAD), P.O. Box 2123 Yaoundé, Cameroon.


*Corresponding Author’s Email:

ngomajebe @
yahoo. com


A study
was conducted at Ongot in the humid forest zone (HFZ) of
Cameroon to determine the extent to which selected soil
quality indicators are affected by cassava cultivation along
a chronosequence of 5, 10 and 20 years. Soil samples were
collected from cassava farms along this chronosequence and
from a nearby forest as reference. The samples were analyzed
for soil organic matter (SOM), organic carbon (OC), total
nitrogen (TN) and pH. SOM, OC and TN decreased significantly
(P<0.05) following years of cassava cultivation. Thus after
20 years of cultivation, SOM and OC contents reduced by 50%
compared to the reference (SOM=35.08 g kg-1, OC=20.39
g kg-1). TN decreased from 2.19 g kg-1
in the reference to 1.24 g kg-1 in farms where
cassava has been cultivated for 20 years. Soil pH ranged
from 5.4 to 5.6 but did not differ (P<0.05) irrespective of
years of cassava cultivation. Generally, significant
differences in soil quality indicators were not observed
between the forest soil and soils from five-year old cassava
farms. This could imply that management strategies to
improve soil quality in the HFZ of Cameroon are warranted
mainly after four years of cassava cultivation.

Keywords: Carbon, Chronosequence, Manihot esculenta
cranz, Nitrogen, pH.

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