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ARS Home » Southeast Area » Tifton, Georgia » Crop Genetics and Breeding Research » Research » Publications at this Location » Publication #366626
Research Project: Development of High-Yielding, High-Oleic Peanut Cultivars or Germplasm with Tolerance to Biotic and Abiotic Stresses

Location: Crop Genetics and Breeding Research

Title: Seasonal variation in canopy size and yield of Rayong 9 cassava genotype under rainfed and irrigated conditions

Author
item MAHAKOSEE, S - Khon Kaen University
item JOGLOY, S - Khon Kaen University
item VORASOOT, N - Khon Kaen University
item THEERAKULPISUT, P - Khon Kaen University
item BANTERNG, P - Khon Kaen University
item KESMALA, T - Khon Kaen University
item Holbrook, Carl - Corley
item KVIEN, C - University Of Georgia

Submitted to: Agronomy
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/10/2019
Publication Date: 9/20/2019
Citation: Mahakosee, S., Jogloy, S., Vorasoot, N., Theerakulpisut, P., Banterng, P., Kesmala, T., Holbrook Jr, C.C., Kvien, C. 2019. Seasonal variation in canopy size and yield of Rayong 9 cassava genotype under rainfed and irrigated conditions. Agronomy. 9:362.

Interpretive Summary: Cassava is an important root crop in Thailand. The objectives of this study were to investigate the effect of seasonal variation on canopy size, and the effect of canopy sized on light penetration under irrigated and rainfed conditions. Cassava crops planted in May under rainfed and irrigated conditions were significantly different for storage root yield, indicating that irrigation at late growth stages during November - January helps to maintain canopy growth and increase cassava storage root yield. In contrast, the crops planted in November under rainfed and irrigated conditions were not significantly different for root yield, indicating that irrigation at early growth stages did not increase root yield although it did affect canopy development, LAI and light penetration.

Technical Abstract: The objectives of this study were to investigate the effect of seasonal variation on canopy size, and the effect of canopy size on light penetration of ‘Rayong 9' cassava under irrigated and rainfed conditions. Rayong 9 was planted under two water regimes in a randomized complete block design with four replications in May and November for two years. At final harvest, years were significantly different (p< 0.05) for biomass, shoot dry weight, and harvest index and contributed to large portions of total variations in shoot dry weight (56.8%) and HI (44.5%). Planting date was a significant source of variations in all measured characters, and it contributed to the largest portions of variations in biomass, storage root dry weight and storage root fresh weight (46.1-60.9%). Water regimes were not significantly different for most characters except for harvest index (p< 0.01). The canopy of the crop planted in May grew rapidly in early growth stages in the rainy season and then slowly after the rainy season. The canopy of the crop planted in November grew rapidly in the middle of the late growth stages. Irrigation did not significantly increase root yield although it slightly increased canopy development, leaf area index (LAI), light penetrations and photosynthesis. Irrigation at the late growth stages of the crop planted in May significantly increased storage root yield.Irrigation at these growth stages helped maintain canopy development, LAI and light penetration.