AUTHOR: NWABUGHIOGU, NGOZI KELECHI (MSc)
DEPARTMENT: SOIL SCIENCE TECHNOLOGY
AFFILIATION: FEDERAL UNIVERSITY OF TECHNOLOGY OWERRI
The effects of incorporating organic waste manure on soil aggregate stability (AS), organic carbon (OC) and soil nitrate-nitrogen (NO3) mainly, of similarly soil textural condition under different managements- pineapple orchard soil (POS), vegetable garden soil (VGS) and cassava cropping soil (CCS) of FUTO research farms Owerri Nigeria was studied. The organic manure cow-dung (CD), poultry manure (PM) and farmyard manure (FYM) used singly (CD, PM, FYM) and in combination (CD +FYM, PM+FYM) were dried, crushed and sieved with a 2 mm sieve. Then applied at 20% of the soil to be amended, which corresponds to 400ton/ha and were replicated for three times. The amended soil was incubated in the green house for four weeks and was continuously watered to field capacity avoiding leaching. Samples of the amended soils were collected in triplicates and analyzed for selected physicochemical properties. The results show that the organic amendment had a significant (P<0.05) effect on the physicochemical properties of the amended soils, with farmyard manure and its combination enhancing soil properties better than the other amendments. It was observed that the aggregate stability and organic carbon of the amended soils increased week after week with the fourth week being the highest.
This is also proved by the significant positive correlation (P>0.01) coefficients of .550**, .620**, .842** and .895** between AS and OC for the first, second, third and four week respectively. These amendments had high effect (95%) on the nitrate-nitrogen of these soils relative to control and it was noticed that this reduced gradually over the weeks. The variations in the results of these amendments were as a result of the effect of land use, rate and time of application, type of amendment and rate of mineralization.
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