The soil fertility effects of leguminous ley pastures in north-east Thailand III. Estimates of soil nitrogen availability

Waring S.A., Gibson T.A. and Ila'Ava V.P. (1994) The soil fertility effects of leguminous ley pastures in north-east Thailand III. Estimates of soil nitrogen availability. Field Crops Research, 39 2-3: 139-145. doi:10.1016/0378-4290(94)90016-7


Author Waring S.A.
Gibson T.A.
Ila'Ava V.P.
Title The soil fertility effects of leguminous ley pastures in north-east Thailand III. Estimates of soil nitrogen availability
Journal name Field Crops Research   Check publisher's open access policy
ISSN 0378-4290
Publication date 1994-01-01
Sub-type Article (original research)
DOI 10.1016/0378-4290(94)90016-7
Volume 39
Issue 2-3
Start page 139
End page 145
Total pages 7
Subject 1102 Cardiovascular Medicine and Haematology
1110 Nursing
Abstract Paper III of this series reports on effects of ley treatments on the results of procedures for assessing soil nitrogen availability and the relationship between the estimates obtained for various availability procedures and test crop yield. Nitrogen availability procedures investigated included the nitrogen mineralisation potential (No) and the rapid procedures waterlogged incubation (WL), extraction with hot 2 M KCl and extraction with a phosphate-borate buffer (PBB). Values for No on a composite soil sample were 27 mg N kg-1 using the standard nutrient solution and 53 mg N kg-1 using a modified nutrient solution (k values were also significantly different). Values of No using the modified nutrient solution for 0-5 cm soil after the legume treatments showed strong treatment effects with values ranging from 44 to 99 mg N kg-1 for the fertilized plots and lower values for the unfertilized plots. After two test crops values were reduced but in the fertilized legume plots were still higher than for cassava control. An attempt to use No to predict field nitrogen release was not successful. Values for WL (0-5 cm soil fertilized plots) at the end of the ley phase were low with significant treatment effects (range 7.6 to 21.8 mg N kg-1). For the KCl method values were very low (range 2.1 to 5.7 mg N kg-1) again with significant treatment effects. The PBB method gave no significant treatment effects. Yields of the first test crop (roselle) were correlated best with WL (R2 = 0.81) followed by organic C (0.73), No (0.69), total N (0.68), KCl (0.51) and PBB (0.33) suggesting WL as the preferred rapid availability index.
Keyword Legumes
Pasture
Soil fertility
Soil nitrogen availability
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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