Growth and yield of cassava as influenced by intercropped soybean and by nitrogen application

Tsay J.S., Fukai S. and Wilson G.L. (1989) Growth and yield of cassava as influenced by intercropped soybean and by nitrogen application. Field Crops Research, 21 2: 83-94. doi:10.1016/0378-4290(89)90044-0


Author Tsay J.S.
Fukai S.
Wilson G.L.
Title Growth and yield of cassava as influenced by intercropped soybean and by nitrogen application
Journal name Field Crops Research   Check publisher's open access policy
ISSN 0378-4290
Publication date 1989-07-01
Sub-type Article (original research)
DOI 10.1016/0378-4290(89)90044-0
Open Access Status
Volume 21
Issue 2
Start page 83
End page 94
Total pages 12
Subject 1102 Cardiovascular Medicine and Haematology
1110 Nursing
Abstract Earlier experiments on cassava/soybean intercropping showed that early-maturing soybean reduced the growth of cassava, but that after soybean maturity partitioning of assimilates favoured tuber growth so that tuber yield was not reduced below that of sole cassava. An experiment was conducted to test the hypothesis that this favourable partitioning was due mainly to limited N availability to the intercropped cassava, and also to examine if performance of cassava/soybean intercropping was affected by the level of N application. There were three N treatments in both sole and intercropped cassava; no application, and application of 80 kg N ha-1 either at planting or at day 85 when soybean was harvested in intercropping. The experimental area was irrigated frequently to minimize the development of plant water stress. In sole-cropping, application of N at planting enhanced leaf area and dry-matter production during early stages of growth, but the effects did not persist until the final harvest. Dry-matter partitioning to tubers was reduced, and in consequence tuber yield tended to be less in this treatment than in the no-N control, although not significantly. Application at day 85 had negligible effects on dry-matter production and partitioning. The adverse effect of soybean on the growth and morphology of intercropped cassava was similar to, but more severe than, that of the no-N application in sole crop. Total dry-matter of intercropped cassava was always less than that of sole cassava in any N treatment. Lateral-branch production and leaf turnover were reduced by the presence of soybean, and the consequent reduction in shoot demand for assimilates resulted in an increased proportion of assimilates partitioned to tubers. When N was applied at planting, harvest index was higher in intercropped than in sole cassava, and tuber yield was similar in the two crops. Intercropping under no N application made only a slight further improvement in harvest index over the corresponding sole cassava, while severely reducing total dry-matter production. It appears, therefore, that the tuber-yield advantage of cassava/soybean intercropping is likely to be small under low availability of soil N.
Q-Index Code C1
Institutional Status Unknown

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