NITROGEN MINERALIZAT ION POTENTIAL Or NEEM (AZADIHACHTA INDICA A. JUSS) SEED CAKE AND ITS UTILIZATION IN SAVANNA SOIL
NITROGEN MINERALIZAT ION POTENTIAL Or NEEM (AZADIHACHTA INDICA A. JUSS) SEED CAKE AND ITS UTILIZATION IN SAVANNA SOIL
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Date
1997-11
Authors
IDRIS, SULAIMAN OLA
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Abstract
ABST RACT
Laboratory incubation studies were earned out on a mixture of neem seed cake (2g)
and soil (lOOg) to assess the N mineralizable potential of ncetn seed cake. Moisture
content of the mixture was maintained by periodic addition of distilled water and the
mixture was incubated at laboratory temperature for 14 weeks. During this time, KC1
extracts of the soil/nccm seed cake mixture were periodically analysed lor KI I,' - N and
No3 - N. The pH of the extracts were also determined.
Simple first order and modified first order E rate equations were fitted to the data
obtained to quantify the potentially mineralizable N. Statistical treatment indicated that the
modified first order E model gave a better fit than the classical first order model. From the
calculated half lives, simple first order and modified first order E equations indicated that
neem seed cake could be added to soil at 4V2 and 6 weeks respectively alter planting (for a
maize that tassels at the 8th week of planting). This would ensure that hall ol the
potentially mineralizable N would be available for the maize utilization.
Trvee cropping sessions of 6 weeks each were conducted in green house studies.
At the end of every cropping, the shoot dry matter yield (SDMY), root dry matter yield
(RDMY), nitrogen uptake of shoot (NS), nitrogen uptake of root (NR). and soil pH were
determined. Soil available P was also determined at the end of first cropping.
The response to the application of neem seed eake in the trials as reflected in
SDMY, RDMY, NS and NR indicated significant difference from the control experiment.
Urea fertilizer and its interaction with the neem seed eake increased the dry matter yield
and N uptake as compared to control. The interactive effect of neem seed eake and urea
gave better response when 80kgN ha of urea were applied than when 40kgN ha of urea
were used as reflected in dry matter yield and N uptake. All the soil amendments increased
soil acidity relative to control experiment. All the plants exhibited V deficiency symptoms
at lirst cropping.
Description
A THESIS SUBMITTED TO THE POST GRADUATE SCHOOL
AHMAD J BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILMENT
OF THE REQUIREMENTS FOR THE AWARD OF MASTER
OF SCIENCE DEGREE IX ANALYTICAL CHEMISTRY
DEPARTMENT OF CHEMISTRY
FACULTY OF SCIENCE
Al IMADU BELLO UNIVERSITY.
ZARIA, NIGERIA
NOVEMBER,
Keywords
NITROGEN, MINERALIZAT ION, POTENTIAL, NEEM, AZADIHACHTA, INDICA A. JUSS, SEED, CAKE, UTILIZATION, SAVANNA, SOIL