The effect of five monoculture treatments on the nitrogen status of a brown clay soil from Narayen, South east Queensland

Leksono, Dwi Pudjo (1989). The effect of five monoculture treatments on the nitrogen status of a brown clay soil from Narayen, South east Queensland Master's Thesis, School of Land, Crop and Food Sciences, The University of Queensland.

       
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Author Leksono, Dwi Pudjo
Thesis Title The effect of five monoculture treatments on the nitrogen status of a brown clay soil from Narayen, South east Queensland
School, Centre or Institute School of Land, Crop and Food Sciences
Institution The University of Queensland
Publication date 1989-03
Thesis type Master's Thesis
Supervisor Dr. S.A. Waring
Total pages 77
Language eng
Subjects 0703 Crop and Pasture Production
070306 Crop and Pasture Nutrition
Formatted abstract
The effect of continuous monoculture of sorghum, mungbean, oats, greenpanic and luceren on the nitrogen status of a brown clay soil from Narayen, South East Queensland was studied using biological and chemical methods.

The soil nitrogen status was estimated by using indices of nitrogen availability i.e. waterlogged incubation method as the biological method and 2 M KCL, phosphate-borate buffer and 0.01 M CaCl_2 as rapid chemical methods. Total soil nitrogen and organic carbon were also included as estimates of soil nitrogen status.

The results obtained by the waterlogged (WL) method were used to evaluate the results obtained by the three rapid chemical methods. The results show that of the three rapid chemical methods 2 M KCL was the most closely correlated with the waterlogged incubation method. Total N and organic C were also highly correlated with the WL method and they may have value as indices of nitrogen availability.

The available N, total N and organic C contents in the 0-5 cm and 5-15cm layer soils were consistently higher under greenpanic and lucerne than for the annual crop treatments. The available N contents as determined by the WL method in the 0-5 cm and 5-15 cm soil layers under greenpanic and lucerne ranged from 75.6 to 126.5 ug N/g soil and 53.2 to 106.7 ug N/g soil, respectively, whereas the values under the annual crop treatments ranged from 13.2 to 75.3 ug N/g soil and 25.6 to 66.1 ug N/g soil, respectively. The total N contents in the 0-5 cm and 5-15 cm layer soils under the greenpanic and lucerne ranged from 0.29 to 0.38 % and 0.20 to 0.33 %, respectively, whereas the values under the annual crop treatments ranged from 0.17 to 0.31 % and 0.17 to 0.25 %, respectively.

The availability of the total N as indicated by the available N as a percentage of the total N in the 0-5 cm and 5-15 cm layer soils under the greenpanic and lucerne ranged from 2.6 to 4.0 % and 2.1 to 3.2 %, respectively, whereas the values under the annual crop treatments ranged from 0.8 to 3.8 % and 1.5 to 2.4 %, respectively. In addition the organic C contents in the 0.5 cm and 5-15 cm layer soils under the greenpanic and lucerne range from 2.4 to 4.0 % and 2.0 to 3.5 %, respectively, whereas the values under the annual crop treatments ranged from 1.4 to 3.3 % and 1.7 to 2.7 %, respectively.
Keyword Soils -- Nitrogen content
Crops and nitrogen
Clay soils -- Queensland, Southeastern

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Thu, 15 Jul 2010, 09:05:59 EST by Belinda Weaver on behalf of School of Integrative Systems