10 - MSB-1423-2014v5n7页

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Molecular Soil Biology 2014, Vol. 5, No. 7, 1-9
http://msb.biopublisher.ca
7
et al., 2012). Soil conditioners, hydrogel and bovine
manure, resulted in higher concentrations of N, P and
K uptake by green pepper (
Capsicum annuum
), which
was attributed to the increased water use efficiency
when soil conditioners were applied. The soil
conditioner used solely produced better growth and
yield of
A. hypogaea
than the control. When used
solely, the inorganic fertilizer had better yield than the
organic, but the reverse was the case when used in
addition to soil conditioner. Organic inputs do no only
provide nutrients but also add to the most important
constituent of the soil humus, which provides
excellent substrate for plant growth. This could be
attributed to the fact that the nutrients in the organic
fertilizer were released gradually through the process
of mineralization (Smith et al., 1993; Mehedi et al.,
2012), maintaining optimal soil levels over prolonged
periods of time. Some of the organic substances
released during the mineralization may act as chelates
that help in the absorption of essential ions and other
micro-nutrients (Lobo et al., 2012). Soil conditioners
in combination with fertilizers were exceptionally
productive probably due to additive effect of
fertilizers in
Zea mays
(Tsado et al., 2011). As a result
of an improved soil conditions, the roots grew better,
more nodules were produced for increased microbial
activities, which resulted in improved vegetative
growth. Organic materials could have formed complex
(or chelate), preventing the precipitation of phosphate,
reduced the P-sorption capacity of the soil, enhanced P
availability, improved P-recovery or resulted in better
utilization by plants (Lobo et al., 2012). Organic
materials add carbon into the soil, provides substrate
for microbial growth, and subsequent microbial
activity. The turnover resulting from the
decomposition of organic materials improves C and N
mineralization rates, and enzyme activities, which
affect nutrient cycling and availability to the plants
(Smith et al., 1993).
The most favorable treatment combination of soil
conditioner and fertilizers may be due to increased
uptake of N and P which resulted in increased number
of leaves and branches as well as biomass. Addition of
soil conditioner in soil was reported to improve soil
physical and chemical properties, which encouraged
better root development, increased nutrient uptake and
water holding capacity, leading to higher fruit yield
and better fruit quality (Tsado et al., 2011; Lobo et al.,
2012). Many studies have demonstrated that use of
organics could enhance efficiency of chemical
fertilizer (Dudal et al., 1995; Suge et al., 2011; Tsado
et al., 2011; Lobo et al., 2012). Also, Vanlauwe et al.
(2002) reported that combination of organic and
inorganic nutrient sources result into synergy and
improved conservation and synchronization of
nutrient release and crop demand, leading to increased
fertilizer efficiency and higher yields. The higher yield
from soil conditioner in addition to fertilizers than
sole applications is an indication that integrated use of
soil conditioner and fertilizers is advantageous over
the use or inorganic or inorganic fertilizers alone.
Integration of organic input with inorganic and
organic fertilizers could therefore be considered as a
better option in increasing fertilizer use efficiency and
provision of a more balanced supply of nutrients.
5 Conclusion
The study shows that inorganic fertilizer, organic
fertilizer and soil conditioner have roles to play in soil
fertility management but none can solely supply all
the nutrients and soil conditions for groundnut growth
and high productivity. Combination of soil conditioner
with inorganic and organic fertilizers further improved
growth and greatly increased yield in this study. This
was due to adequate supply of essential nutrients as
nutrient supplying capacity of the soil increased by
favorable effect of the organic conditioner on soil
physical and biological properties. Therefore,
application of soil conditioner in combination with
organic and inorganic fertilizers can be used as
nutrient sources to meet the soil conditions and
nutrient requirements for sustainable groundnut
production.
References
Adediran J.A., and Banjoko V.A., 2003, Comparative
effectiveness of soil compost fertilizer formulation for
maize in Nigeria, Nigeria Soil Science, 13: 42-48
Allam M.M., Hassamuzzamm M., and Nahar K., 2009, Tiller
dynamics of three irrigated rice varieties under phosphorus
levels. American-Eurasian Journal of Agronomy, 2(2):
84-94