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Effect of organic fertilizers on nitrate accumulation in vegetables and mineral nitrogen in tropical soils of Morogoro, Tanzania

Marcelina Aloyce Baitilwake UGent, Sara De Bolle UGent, Joost Salomez UGent, Jerome P Mrema and Stefaan De Neve UGent (2012) EXPERIMENTAL AGRICULTURE. 48(1). p.111-126
abstract
Nitrogen (N) nutrition is a key factor for vegetable growth and yield. However, different rates of nitrogen fertilization may trigger different responses to vegetables. A survey was conducted to investigate the effect of soil fertility management practices on nitrate concentration in vegetables. The survey results were used to plan experiments on the effect of chicken and cattle manures on nitrate levels in Chinese cabbage (Brassica rapa) and amaranthus (Amaranthus cruentus) grown in Tanzania and the patterns of mineral nitrogen in soils under open field conditions. Chicken or cattle manure at 200, 300 kg N ha(-1) and 170 250 kg N ha(-1) for Chinese cabbage and amaranthus respectively, and control were compared in a randomized complete block design. We observed a higher nitrate content in fertilized Chinese cabbage at day 30 than at day 44 after sowing, ranging from 3243 to 4993 mg kg(-1) fresh matter regardless of the N source and rates. Only application of manures at high levels (250 kg N ha(-1)) induced significantly (p < 0.05) higher nitrate contents in amaranthus at day 28 after sowing, although there was a clear indication of nitrate accumulation even at 170 kg N ha(-1) application. Soil NH(4)(+)-N + NO(3) -N in both Chinese cabbage and amaranthus plots were increased with increasing N application rates and differences between control and amended soils were significant (p < 0.01). There was a positive relationship between NO(3)(-) concentration in vegetables and NO(3) -N in the rooted top soil layer (0-15 cm). However, higher NH(4)(+) concentrations depressed NO(3) build up in crops and a significant negative relationship between soil (NH(4)(+)-N)/(NO(3)(-)-N) ratio and crop NO(3)(-) content was found. It is concluded that low manure application rates result in similar yields to high rates but reduces nitrate accumulation in vegetables and excess mineral nitrogen in soils.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
NITRITE
journal title
EXPERIMENTAL AGRICULTURE
Exp. Agric.
volume
48
issue
1
pages
111 - 126
Web of Science type
Article
Web of Science id
000298084500008
JCR category
AGRONOMY
JCR impact factor
1.062 (2012)
JCR rank
34/78 (2012)
JCR quartile
2 (2012)
ISSN
0014-4797
DOI
10.1017/S0014479711000810
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2008567
handle
http://hdl.handle.net/1854/LU-2008567
date created
2012-01-31 09:11:52
date last changed
2012-03-07 16:09:16
@article{2008567,
  abstract     = {Nitrogen (N) nutrition is a key factor for vegetable growth and yield. However, different rates of nitrogen fertilization may trigger different responses to vegetables. A survey was conducted to investigate the effect of soil fertility management practices on nitrate concentration in vegetables. The survey results were used to plan experiments on the effect of chicken and cattle manures on nitrate levels in Chinese cabbage (Brassica rapa) and amaranthus (Amaranthus cruentus) grown in Tanzania and the patterns of mineral nitrogen in soils under open field conditions. Chicken or cattle manure at 200, 300 kg N ha(-1) and 170 250 kg N ha(-1) for Chinese cabbage and amaranthus respectively, and control were compared in a randomized complete block design. We observed a higher nitrate content in fertilized Chinese cabbage at day 30 than at day 44 after sowing, ranging from 3243 to 4993 mg kg(-1) fresh matter regardless of the N source and rates. Only application of manures at high levels (250 kg N ha(-1)) induced significantly (p {\textlangle} 0.05) higher nitrate contents in amaranthus at day 28 after sowing, although there was a clear indication of nitrate accumulation even at 170 kg N ha(-1) application. Soil NH(4)(+)-N + NO(3) -N in both Chinese cabbage and amaranthus plots were increased with increasing N application rates and differences between control and amended soils were significant (p {\textlangle} 0.01). There was a positive relationship between NO(3)(-) concentration in vegetables and NO(3) -N in the rooted top soil layer (0-15 cm). However, higher NH(4)(+) concentrations depressed NO(3) build up in crops and a significant negative relationship between soil (NH(4)(+)-N)/(NO(3)(-)-N) ratio and crop NO(3)(-) content was found. It is concluded that low manure application rates result in similar yields to high rates but reduces nitrate accumulation in vegetables and excess mineral nitrogen in soils.},
  author       = {Baitilwake, Marcelina Aloyce and De Bolle, Sara and Salomez, Joost and Mrema, Jerome P and De Neve, Stefaan},
  issn         = {0014-4797},
  journal      = {EXPERIMENTAL AGRICULTURE},
  keyword      = {NITRITE},
  language     = {eng},
  number       = {1},
  pages        = {111--126},
  title        = {Effect of organic fertilizers on nitrate accumulation in vegetables and mineral nitrogen in tropical soils of Morogoro, Tanzania},
  url          = {http://dx.doi.org/10.1017/S0014479711000810},
  volume       = {48},
  year         = {2012},
}

Chicago
Baitilwake, Marcelina Aloyce, Sara De Bolle, Joost Salomez, Jerome P Mrema, and Stefaan De Neve. 2012. “Effect of Organic Fertilizers on Nitrate Accumulation in Vegetables and Mineral Nitrogen in Tropical Soils of Morogoro, Tanzania.” Experimental Agriculture 48 (1): 111–126.
APA
Baitilwake, M. A., De Bolle, S., Salomez, J., Mrema, J. P., & De Neve, S. (2012). Effect of organic fertilizers on nitrate accumulation in vegetables and mineral nitrogen in tropical soils of Morogoro, Tanzania. EXPERIMENTAL AGRICULTURE, 48(1), 111–126.
Vancouver
1.
Baitilwake MA, De Bolle S, Salomez J, Mrema JP, De Neve S. Effect of organic fertilizers on nitrate accumulation in vegetables and mineral nitrogen in tropical soils of Morogoro, Tanzania. EXPERIMENTAL AGRICULTURE. 2012;48(1):111–26.
MLA
Baitilwake, Marcelina Aloyce, Sara De Bolle, Joost Salomez, et al. “Effect of Organic Fertilizers on Nitrate Accumulation in Vegetables and Mineral Nitrogen in Tropical Soils of Morogoro, Tanzania.” EXPERIMENTAL AGRICULTURE 48.1 (2012): 111–126. Print.