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IJSTR >> Volume 5 - Issue 4, April 2016 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Effects Of Artificial Defoliations On The Growth And Yield Of Okra (Abelmoschus Esculentus (L.)(Moench.) CV ‘Smooth Cayene’ Under Mid-Elevation Condition

[Full Text]

 

AUTHOR(S)

Eric Randy R. Politud

 

KEYWORDS

Defoliation, defoliation of lower half of the stem (DLHS), erectophile, leaf area index (LAI), mutual shading, pods, Smooth Cayene, return on investment (ROI), week after sowing (WAS)

 

ABSTRACT

Defoliation of the lower leaves of the stem provides the upper leaves to maximize their photosynthetic activity, thus optimizing their growth and yield potentials. This study was conducted to determine the effect of artificial defoliations on the growth and yield of okra under the mid-elevation condition of Bukidnon, Northern Mindanao, Philippines. A Randomized Complete Block Design (RCBD) with four treatments and three replications was used, namely: T1 (no defoliation), T2 (defoliation of lower half of the stem- DLHS at 5 weeks after sowing-WAS), T3 (DHLS at 6 WAS), and T4 (DLHS at 7 WAS). Results revealed that artificial defoliations significantly influenced the production of pods, weight of pods per plant and the total pod yield per hectare, but not with the plant height, pest resistance, days to flowering, and length and diameter of pods. Removal of the lower leaves of the stem paved the way for upper leaves to intensify photosynthetic activity and minimized mutual shading and competition for foods. Treatment 4 consistently obtained the most number of pods (82), heaviest pods per plant (394.81 g) and highest total yield (9.87 t/ha). Consistently, T4 (defoliation at 7 WAS) registered the highest ROI with 425%, while T1 obtained the lowest with 316.11%. Thus, defoliations at 7 WAS of the lower leaves gave better growth and yield performance of Smooth Cayene variety than those undefoliated under the mid-elevation condition of Bukidnon.

 

REFERENCES

[1] AVRDC, “Know your IVS (Okra)”, Leaflet No.6. DA-BAR, SAMREM CRSP and ADB. 2010.

[2] AVRDC Vegetable Genetic Resources Information System (AVGRIS), “AVRDC-The World. Vegetable Center,” Shanhua, Tainan, Taiwan. 2005. Website: http:/203.64.245.173/avgris/

[3] O.K. Bautista. Introducton to Tropical Horticulture (2nd Edit.).

[4] SEAMEO-SEARCA. UPLB, College, Laguna, Philippines. 1994.

[5] BAS R-10, “Annual Report of Agricultural Commodities”, Region X – Bureau of Agricultural Statistics Office. Cagayan de Oro City, Philippines. 2011.

[6] BAS,Bukidnon, “Annual Report of Agricultural Commodities”, Bukidnon – Bureau of Agricultural Statistics Office. Malaybalay City, Philippines. 2012.

[7] Y.T. Gan, L. Li, R. Bueckert, and T.D. Warkentin, “Shading Defoliation and Light Enrichment Effects on Chickpea in Northern Latitudes”, Agriculture and Agri. Food, Canada. 2009.

[8] H.T. Hartman, D.E. Kester, F.T. Davies, Jr., and F.L. Geneve. Plant Propagation (Principles and Practices). Prentice Hall, Upper Saddle River, New Jersey, USA. 1997. p. 458.

[9] G.O. Iremiren, “Effects of Artificial Defoliations on the Growth and Yield of Okra (Abelmoschus esculentus)”, Department of Crop Production, Bendel State university, PMB 14, Ek Poma, Nigeria.1986.

[10] R.Konchhar,”All About Okra”, 2006. retrieved: http//:www.kochhar@ physiology.wisc.educ.

[11] H.M. Pava. An Introduction to Crop Science (2nd Edit.), CMU, Musuan, Bukidnon, Publication Office. 1994. pp. 71-87.

[12] PCARRD, “Okra Production Guide”, Information Bulletin No.149-A. 2007.

[13] F.T. Pere, “Effects of Defoliation and Organic Fertilization on the Growth and Yield of Okra (Abelmochus esculentus (L.) Moech)”, Undergraduate Thesis. MOSCAT, Claveria, Misamis Oriental, Philippines. 2011. pp. 75.

[14] R.P. Singh and K.P.P. Nair, “Defoliation Studies in Hybrid Maize: II Dry-Matter Accumulation, LAI, Silking and Yield Components”, Department of Agronomy, G.B. Plant University of Agriculture and Technology, Pantnagar India. 1974.

[15] R. Zhigang Zhan, H. Dong Li, Y. Guo, D.H. Cournede, D. De Reffye, and D. Coll, “Effects of Defoliation on the Growth of Cotton Plant Using the Functional Structural Model GREENLAB”, Resources and Environment, China Agric. Univ, Beijing. 2006.