Location: Crop Genetics and Breeding ResearchTitle: Light interception and radiation use efficiency of cassava under irrigated and rainfed conditions and seasonal variations
|MAHAKOSEE, S - Khon Kaen University|
|JOGLOY, S - Khon Kaen University|
|VORASOOT, N - Khon Kaen University|
|THEERAKULPISUT, P - Khon Kaen University|
|Holbrook, Carl - Corley|
|KVIEN, C - University Of Georgia|
|BANTERNG, P - Khon Kaen University|
Submitted to: Agriculture
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/30/2022
Publication Date: 5/21/2022
Citation: Mahakosee, S., Jogloy, S., Vorasoot, N., Theerakulpisut, P., Holbrook Jr, C.C., Kvien, C.K., Banterng, P. 2022. Light interception and radiation use efficiency of cassava under irrigated and rainfed conditions and seasonal variations. Agriculture. 12(5):725. https://doi.org/10.3390/agriculture12050725.
Interpretive Summary: Cassava is an important root crop in Thailand. The objectives of this study were to investigate the effect of irrigation on photosynthesis, yield of biomass and storage root yield. The effect of irrigated or rainfed water conditions in cassava were evaluated under 2 planting dates for 2 years. The amount of leaf area affected photosynthesis and the amount of light that was able to penetrate the crop canopy. Photosynthesis, yield of biomass and storage root yield were dependent on water conditions, crop growth stages and seasons. Irrigation at late growth stages maintained higher photosynthesis and yield for the crop planted in May, whereas no significant differences were observed for the crop planted in November.
Technical Abstract: Determining the effect of irrigated and rainfed conditions on light interception, light extinction coefficient (k), radiation use efficiency (RUE), biomass and storage root accumulation of cassava was the objective of this study. Field experiments were arranged in a Randomized Complete Block Design (RCBD) with 4 replications. The effect of irrigated or rainfed water conditions in cassava were evaluated under 2 planting dates for 2 years. Light interception depended on k and LAI which affected solar radiation accumulation and thus biomass production for cassava. The k values ranged from 0.49-0.93 and 0.46-0.86 for irrigated and rainfed crops, respectively. The RUEbi and RUEsr depended on water conditions, crop growth stages and seasons, whereas rainfed crops in May planting were slightly lower in RUEbi than irrigated crops. RUEbi of the crop planted in November was not significantly different for irrigated and rainfed crops. Irrigation at the late growth stage could maintain higher LAI, light interception, and RUE for the crop planted in May, whereas those in November planting were not significantly different.