John Bako Baon
ICCRI

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Ammonia Volatilization in Cocoa Farm as Affected by Sugarcane Filter Cake Supply at Different Urea and Soil Moisture Levels Prastowo, Erwin; Hikmah, Nadya Faiqotul; Baon, John Bako
Pelita Perkebunan (Coffee and Cocoa Research Journal) Vol 30, No 3 (2014)
Publisher : Indonesian Coffee and Cocoa Research Institute

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Abstract

Ammonia  (NH3)  volatilization  is  a  crucial  mechanism  in  soil  nitrogen  (N) cycle. It accounts for main loss  of N in cocoa  farms  when  environment is  suitable to  promote  the  emission.  A  research  to  locate  a  link  of  several  factors,  namely, sugarcane filter cake  (SFC), urea  and soil moisture content  to NH 3 volatilization,  and  to reveal  cocoa  N  uptake  and  urea  fertilizer  efficiency  was  taken  place  both  in  a laboratory  with  the  incubation  technique,  and  in  a  greenhouse  as  a  pot  trial. The design was completely randomized design in factorial. The soil was Inceptisol from Kaliwining Experimental Station, Jember, East Java, collected from top soil of  a  productive  cocoa  farm.  A  closed  trap  system  was  designed  to  measurevolatilized  NH 3 from  soil  and  SFC  mixture  incubated  for  14  days.  For  the  pot experiment,  cocoa  clone  of  Scavina  6  seedlings  were  grown  for  six  months  withtreatments  involving  series  level  of  SFC  and  series  level  of  urea.  Soil  moisture content influenced volatilized NH3 by reducing 50% emission in where it was more obvious in higher level of urea applied. It was more than 90% in average for the increase in volatilized NH 3roduced by increasing in level of urea from 0 to 0.4 g kg -1 in  overall  level  of  combinations. An increase in urea  level  had  resulted in increase in  soil  pH, and  Parson correlation suggested a direct  link  with  volatilized  NH 3  We found  a  relationship  between  SFC  and volatilized  NH 3 and  their combinations  with soil  moisture  and  urea  content  were  able  to  inhibit  the  emission.  Emission decrease  up  to  28%  was  observed  from  0  to  100  g  SFC  kg-1.  This  inhibition may  have contributed to  the increase in  N cocoa  plant uptake  by  more  than  70% compared  to  control  and  subsequent  increase  in  N  fertilizer  supply  efficiency up to 86%  in the combination with 0.2  g urea  kg-1.  The absence of SFC had made a decline in urea efficiency about 20 times.Keywords: ammonia volatilization, sugarcane filter cake, urea, soil moisture, cocoa
Use of Plant Derived Ash as Potassium Fertilizer and Its Effects on Soil Nutrient Status and Cocoa Growth Baon, John Bako
JOURNAL OF TROPICAL SOILS Vol 14, No 3: September 2009
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2009.v14i3.185-193

Abstract

Analternative to replacing the expensive potassium (K) fertilizers, such as KCl, should be investigated by Indonesia as the third largest cocoa (Theobroma cacao L.) producing country. The objective of this study is to investigate the effect of plant derived ash (PDAsh) application on soil nutrient status and growth of cocoa. This research was conducted in ICCRI, Jember, using a soil from Balung subdistrict, Jember, East Java. Two series of experiments with and without cocoa plants consisted of six treatments replicated four times were laid in randomized completly block design. The six treatments of K2O applied were 0, 300, 600, 900, 1200 and 1500 mg 2.5 kg-1 soil. Results of this study showed that application of PDAsh as K fertilizer increased the availability of K and Mg in soil and K content in plant tissue. In case of Mn, the concentration in soil decreased in the experiment with cocoa plants, on the other hand the concentration increased where no cocoa plants and the relation followed quadratic curve. The results also indicated that application of PDAsh up to 1500 mg K2O 2.5 kg-1soil resulted in soil pH of 7.4 in two months after application and reached 6.8 in 6 months compared with the pH of ash was 13. Application of PDAsh 700 mg 2.5 kg-1soil resulted in optimum cocoa seedling growth compared to other dosages tested, in term of plant height, plant diameter, leaf number, fresh and dry shoot weight.