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Nitrogen balances as a basis for improved nitrogen use efficiency in vegetable production in Central Java, Indonesia

Widowati Ladiyani Retno UGent (2012)
abstract
Vegetable production is an agricultural sector with high added value, and very labour intensive in Indonesi. It thus plays a crucial role in the overall agricultural economy. With the growing demand for more varied types of vegetables in tropical countries, mainly temperate-type vegetables, the cultivation is necessarily carried out in the highlands, since these vegetables require specific growing conditions, where climate (temperature) is the dominant vegetable growth factor. Since temperate vegetables have in general higher economic returns, farmers in tropical countries tend to apply increasingly more inputs (fertilizers and pesticides) in order to maximize production. Vegetable farming systems in tropical highlands are thus almost by definition very intensive, and face a variety of environmental problems. Planting on slopes that do not heed the rules of conservation, application of pesticides exceeding the recommended limits, and excessive application of fertilizers and organic materials are frequent practices carried out by farmers. Excessive fertilization, in particular nitrogen, by vegetable farmers leads to nitrate leaching to water bodies and soil pollution. Improving fertilizer recommendations for highland vegetable fertilization is therefore much needed. In view of the above, a study on improved N use efficiency through the use of N balances in vegetable production in Central-Java (Indonesia) was initiated and carried out with financial support of VLIR-UOS. During research activities a series of supporting data on the improvement of fertilizing recommendations were gathered namely data on N mineralization potential, N mineralization from exogenous organic material, mineral N dynamics in soil, and N uptake, with a view to improve N use efficiency and sustainability of intensive vegetable production in that area. The research result on nitrogen mineralization for improvement of fertilizing recommendation was the soil used Andisols and Inceptisols had a higher N mineralization capacity than in other tropical country. These soils had the same absolute N mineralization values, but significantly different percentages of total mineralized N. The relative N mineralization values from total N added did not have any significant correlation with the biochemical composition due to the large variation in material. The second research was on nitrogen balance which approved that N fertilization can be drastically reduced in these intensive cropping systems without having a significant negative impact on the yield. Therefore, lower fertilizer quantity was related to a higher N efficiency. High positive value of the N balance and indication of leaching of this nutrient reflected from the potential nitrate concentration (PNC) at a soil depth of 1 m.
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author
promoter
UGent
organization
alternative title
Stikstofbalansen als basis voor een betere stikstofefficiëntie in groenteteelt in Centraal-Java, Indonesië
year
type
dissertation (monograph)
subject
keyword
vegetable, N Use efficiency, Nitrogen, nitrogen balance, Indonesia
pages
VI, 167 pages
publisher
Ghent University. Faculty of Bioscience Engineering
place of publication
Ghent, Belgium
defense location
Gent : faculteit Bio-ingenieurswetenschappen (E1.012)
defense date
2012-11-20 16:00
ISBN
9789059895638
language
English
UGent publication?
yes
classification
D1
additional info
dissertation consists of copyrighted material
copyright statement
I have transferred the copyright for this publication to the publisher
id
3052871
handle
http://hdl.handle.net/1854/LU-3052871
date created
2012-11-14 12:33:57
date last changed
2012-11-19 09:16:32
@phdthesis{3052871,
  abstract     = {Vegetable production is an agricultural sector with high added value, and very labour intensive in Indonesi. It thus plays a crucial role in the overall agricultural economy. With the growing demand for more varied types of vegetables in tropical countries, mainly temperate-type vegetables, the cultivation is necessarily carried out in the highlands, since these vegetables require specific growing conditions, where climate (temperature) is the dominant vegetable growth factor. Since temperate vegetables have in general higher economic returns, farmers in tropical countries tend to apply increasingly more inputs (fertilizers and pesticides) in order to maximize production. Vegetable farming systems in tropical highlands are thus almost by definition very intensive, and face a variety of environmental problems. Planting on slopes that do not heed the rules of conservation, application of pesticides exceeding the recommended limits, and excessive application of fertilizers and organic materials are frequent practices carried out by farmers. Excessive fertilization, in particular nitrogen, by vegetable farmers leads to nitrate leaching to water bodies and soil pollution.
Improving fertilizer recommendations for highland vegetable fertilization is therefore much needed. In view of the above, a study on improved N use efficiency through the use of N balances in vegetable production in Central-Java (Indonesia) was initiated and carried out with financial support of VLIR-UOS. During research activities a series of supporting data on the improvement of fertilizing recommendations were gathered namely data on N mineralization potential, N mineralization from exogenous organic material, mineral N dynamics in soil, and N uptake, with a view to improve N use efficiency and sustainability of intensive vegetable production in that area. 
The research result on nitrogen mineralization for improvement of fertilizing recommendation was the soil used Andisols and Inceptisols had a higher N mineralization capacity than in other tropical country. These soils had the same absolute N mineralization values, but significantly different percentages of total mineralized N. The relative N mineralization values from total N added did not have any significant correlation with the biochemical composition due to the large variation in material. The second research was on nitrogen balance which approved that N fertilization can be drastically reduced in these intensive cropping systems without having a significant negative impact on the yield. Therefore, lower fertilizer quantity was related to a higher N efficiency.  High positive value of the N balance and indication of leaching of this nutrient reflected from the potential nitrate concentration (PNC) at a soil depth of 1 m.},
  author       = {Ladiyani Retno, Widowati},
  isbn         = {9789059895638},
  keyword      = {vegetable,N Use efficiency,Nitrogen,nitrogen balance,Indonesia},
  language     = {eng},
  pages        = {VI, 167},
  publisher    = {Ghent University. Faculty of Bioscience Engineering},
  school       = {Ghent University},
  title        = {Nitrogen balances as a basis for improved nitrogen use efficiency in vegetable production in Central Java, Indonesia},
  year         = {2012},
}

Chicago
Ladiyani Retno, Widowati. 2012. “Nitrogen Balances as a Basis for Improved Nitrogen Use Efficiency in Vegetable Production in Central Java, Indonesia”. Ghent, Belgium: Ghent University. Faculty of Bioscience Engineering.
APA
Ladiyani Retno, W. (2012). Nitrogen balances as a basis for improved nitrogen use efficiency in vegetable production in Central Java, Indonesia. Ghent University. Faculty of Bioscience Engineering, Ghent, Belgium.
Vancouver
1.
Ladiyani Retno W. Nitrogen balances as a basis for improved nitrogen use efficiency in vegetable production in Central Java, Indonesia. [Ghent, Belgium]: Ghent University. Faculty of Bioscience Engineering; 2012.
MLA
Ladiyani Retno, Widowati. “Nitrogen Balances as a Basis for Improved Nitrogen Use Efficiency in Vegetable Production in Central Java, Indonesia.” 2012 : n. pag. Print.