Polthanee, A. and Promsaena, K. and Laoken, A. (2011) Influence of low light intensity on growth and yield of four soybean cultivars during wet and dry seasons of northeast Thailand. Agricultural Sciences, 2 (2). pp. 61-67.
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Abstract
Crop is commonly grown in intercrop combina-tions of which cereal/legumes are the most widespread in tropical countries. The availability of low light intensity due to shading is the critical factor in determining legume yield in intercrop-ping. The experiment searches of better soybean cultivar for intercropping. A field experiment was conducted at the experimental farm of Khon Kaen University in 2005. The objectives of this study were to determine the influence of light regimes (30% of normal light, 50% of normal light and normal light) on the growth and yield of four soybean cultivars (early, medium and late matur-ity) under artificial shading at 35 days after seed-ing until harvest in the wet and dry seasons. The results showed that grain yield was significantly (p < 0.05) decreased under the low light intensity at 30% of natural light both in wet and dry season. This was mainly due to low light intensity at 30% of natural light decreasing the number of pods per plant in the dry season. For cultivars, grain yield was significantly difference (p < 0.05) among cultivars both in the wet and dry seasons. The cultivar KKU 74 (medium maturity) gave maximum grain yield both in wet and dry season under the low light at 30% of natural light. The KKU 74 cultivar is better adapted to shading en-vironment than other cultivars. This was due to the KKU 74 cultivar produced higher chlorophyll b concentration in leaves after the plant experi-enced to shading. This physiological character can be used for soybean breeding program in shading tolerance. Therefore, the cultivar KKU 74 had a higher potential yield advantage in inter-cropping sy- stems in which low light intensity is a major limiting factor on grain yield.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Plant Science and Agricultural Resources, Faculty of Agriculture, Khon Kaen University, Khon Kaen, Thailand |
| Subjects: | Plant Production > Production Practices |
| Divisions: | Soyabean |
| Depositing User: | David T |
| Date Deposited: | 15 Jul 2011 03:08 |
| Last Modified: | 15 Jul 2011 03:08 |
| Official URL: | http://dx.doi.org/10.4236/as.2011.22010 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/2355 |
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