CHAPTER 5. CONCLUSION AND
RECOMANDATIONS
5.1 Conclusion
The study entitled « Influence of FYM and lime on
availability of Phosphorus ,growth and yield of carrot in volcanic soil of
Busogo» had the aim of comparing the effect of FYM and Lime on
availability of phosphorus and other related parameters such as Organic
matter content ,pH (both water and KCl),Total Nitrogen, Exchangeable Magnesium
and Calcium, and total exchangeable acidity ,and consequently on growth and
yield of carrots in the mentioned area.
The obtained results have shown that both water and KCl pH
have increased where both lime an FYM have been applied while they have
slightly decreased in T0 (control) .Before experiment, both pH water and KCl
varied from5.6 to 5.9 and 4.5 to 4.7 respectively. After experimentation, they
respectively varied from 5.7 to 6.5 and 4.6 to 5.6.
The organic mater content was 5.603 % in control and slightly
decreased up to5.52 % due to leaching by high rainfall that took place during
the experimentation. In the treatments that received lime, there also was a
decrease in organic matter content. Before experiment, the organic matter
content was 5.654 %, 5.585 % and 5.62 %, and it became 5.52 %, 5.5 % and 5.46
%, respectively for T4, T5 and T6 after experiment .In treatments where the FYM
was applied, there was an increase in organic matter content, which was 5.62 %,
5.672 % and 5.63, and became 6.2 %, 6.64 % and 6.9, respectively for T1, T2 and
T3 after experiment.
The total nitrogen decreased in control and treatments that
received lime and increased where the FYM was applied. Before experiment, the
total nitrogen was 0.276 %, 0.270 %, 0.269 % and 0.270 % for respectively
Control, T4, T5 and T6. At the end of experiment, the total nitrogen content
was respectively 0.276 %, 0.270 %, 0.269 % and 0.270 %. For the treatment that
received organic matter, there was an increase in total nitrogen; the total
nitrogen content was 0.279 %, 0.2836 % and 0.280 and it became 0.29 %, 0.320 %
and 0.339 % after experiment, respectively for T1, T2 T3.
The Ca content in soil slightly decreased in control and
increased in other treatments. Before experiment, it varied from 0.62 meq/100g
to 64 meq/100. After experiment, it varied from 0.6 meq/ 100g to 0.75 meq/
100g.
The Mg showed the little change in all treatments. It
decreased in Control and increased in all other treatments. It varied from 0.26
meq/100g to 0.28 meq/100g and 0.24 meq/100g to 0.296 meq/100g, respectively
before and after experiment.
The phosphorus increased in all treatments except Control
where there was a decrease. It varied from 60 ppm to 60.5 ppm and 59.5 ppm to
70 ppm, respectively before and after experiment. According to obtained
results, both lime and manure improved soil properties.
For the height of plant, it varies from 8.3 cm to 11.2 cm, 20
cm to 29 cm and 41.8 cm to 45 cm respectively at 30 days, 60 days and 90 days.
The length of tap root at harvesting time varied from 11.5 cm and 17.1 cm and
the diameter varied from 2.7 cm to 3.9 cm. The yield of tap root varied from
12.1t/ha and 22.5 t/ha. For all agronomic parameters, the FYM showed the best
performance, followed by lime and the Control showed the last performance.
5.2.
Recommendations
From the results obtained above, the following recommendations
are formulated:
Ø The use of organic matter is of paramount important in
volcanic soil of Busogo as it plays a major role in improving soil properties
and supplying nutrients to grown crops. Chemical fertilizers must be used in
combination with organic matter to supply others plants nutrients because even
if Phosphorus may be sufficient, in the absence of others elements, their
effect is not remarkable for increasing the yield.
Ø As the volcanic area is subjected to high rainfall
all over the year, the soil is susceptible to become more acidic by leaching of
basic cations (Rayar, 2000). The liming is necessary after soil pH analysis
because the soil pH below 5.5 is not suitable to many crops as it causes the
Aluminum toxicity to crops (Arthaud, 1982).
Ø In case of liming, both calcite and dolomite limes are
recommended as the level of both Magnesium and Calcium is very low.
Ø The study should be repeated in different seasons and
at different sites in volcanic soils, using different sources of both organic
and mineral amendments, to verify the obtained results. The study of effect of
the combination of different sources of both organic and mineral amendments
should be carried out to compare their influence on the phosphorus
availability.
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