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Agro-Science
Journal of Tropical Agriculture, Food, Environment and Extension
 

ISSN 1119-7455
   
 
         
 
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Article No 6 of Volume 7.3 (2008)
 
    
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CONTRIBUTIONS OF ORGANIC AMENDMENTS TO EXCHANGEABLE POTASSIUM PERCENT AND SOIL NITRATE CONCENTRATION IN AN ULTISOL AND THEIR EFFECT ON MAIZE (ZEA MAYS L) GRAIN YIELD

Mbah C.N.

 Department of Soil and Environmental Management; Ebonyi State University, Abakaliki, Nigeria

 

ABSTRACT

The effect of organic wastes on soil exchangeable potassium percent (EPP), Nitrate (N03-) concentration and maize yield was evaluated in an ultisol during the 1999, 2000 and 2001 cropping seasons. The experiment was a split plot in randomized complete block design (RCBD). The wastes comprising poultry droppings (PD), cow dung (CD), swine waste (SW) and sewage sludge (SS) were applied concurrently (at the rates of 0, 12 and 24 kg/Plot), equivalent to 0, 10 and 20 t ha-1) for two years and the residual effect tested in the third year. Results of the study show that soil EPP values ranged between 2.4 and 4.3% (first season), 1.8-3% (second season) and 1.2 – 2.7% (third season)  in waste amended plots. Similarly wastes significantly (P < 0.05) increased soil NO3- concentration with percentage increase of 8 to 30% (first season) 25 to 39% (second season) and 43% to 143% (third season) relative to the control. Grain yield significantly (p<0.05) increased in waste amended plots relative to the control. Results of the study also showed that grain yield correlated positively with EPP and NO3- concentration in the first and second seasons, indicating that both elements contributed to the final grain yield. However, non-significant correlation was observed between grain yield and the studied parameters (EPP and NO3-) in the third season, indicating that the amendments contributed less to grain yield in the residual trial. The results of the study showed that the amendments increased soil EPP and NO3- concentration to non-toxic level and are therefore, safe for agricultural use at the rates studied.

 

Keywords: Exchangeable potassium percent, organic wastes, soil nitrate concentration, grain yield  

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Date:17/01/2018
 
     
 
 
 
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