Ratoon Rice: A Climate and Resource Smart Technology

Negalur, R.B.; Yadahalli, G. S.; Chittapur, B. M.; Guruprasad, Gireesh; Narappa, G.

doi:10.20546/ijcmas.2017.605.179

Cited by 31 publications

(17 citation statements)

References 10 publications

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“…We allocated those practices to two levels of an L 16 orthogonal array (Taguchi, 1986) and conducted a pot experiment. To test robustness, the experiment was replicated under standard conditions and poor conditions, namely low plant density, no fertilization, continuous flood water management, and late harvesting: these conditions are known to reduce the yield of ratoon cropping of rice (Negalur et al, 2017). We analyzed the effect of each of the four practices on ratoon tillers and yield.…”

Section: Methodsmentioning

confidence: 99%

“…Germinated seeds (Jasmin 85 variety from Can Tho University, popular in the Mekong Delta) were used. Jasmin is an Indica and has characteristics unsuitable for ratoon cropping of rice (Negalur et al, 2017). These disadvantages will amplify the effects of the practices.…”

Section: Methodsmentioning

confidence: 99%

“…However, the additional yield achieved after harvesting the main crop has allowed its successful commercial application in the southern region of the United States of America and parts of southern China (Sacks, 2013). Most studies on ratoon rice have focused on additional yield, and the yield is at most 50% of the main crop (Negalur et al, 2017). A previous study reported a yield of up to 90% of the main crop using a special variety (PR23), but the fluctuations in yield were very large (Zhang et al, 2014).…”

Section: Ratoon Ricementioning

confidence: 99%

“…The poor conditions were as follows: low plant density (nine plants per pot), no fertilization (except the pre-fertilization treatment), continuous flooding water management (0 to 5 cm, from seven days after seeding to 10 days before harvesting), and late harvesting (seeded 10 days before the standard condition plants and harvesting on the same day of harvesting as the standard conditions). These conditions are known to negatively affect ratoon cropping of rice (Negalur et al, 2017).…”

Section: Conditionsmentioning

confidence: 99%

“…The extensions of nodes were smaller under standard conditions than those under poor conditions. There is no consensus about the ideal cutting height (Negalur et al, 2017), although previous studies were not carried out using the SALIBU method.…”

Section: Effect Of Practicesmentioning

confidence: 99%

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Evaluation of cropping method for perennial ratoon rice (SALIBU)

2019

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Background: Generally, the yield of ratoon rice is at most 50% of the main crop. However, a cropping method “SALIBU” achieved more yield than the main crop and could be used for the cultivation of perennial cropping. Although the SALIBU method is implementing 10 additional management practices to conventional method, the effect of each management practice is unclear. Therefore, we aimed to evaluate the effect size and the robustness of each management practice. Methodology: We evaluated the effect size using an L16 orthogonal array design pot experiment. For the robustness, we duplicated the experiment under both standard and checked whether the practice shows the same effect size. The bad conditions were low plant density, no fertilization, continuous flooding water management, and late harvesting. Results: The ratoon rice yield was proportional to the number of ratoon tillers used as in conventionally produced ratoon rice. Late cutting was most affected to the number of ratoon tillers. Importantly, this effect was reversed; the effect was positive under bad conditions, but was negative under standard conditions. Furthermore, late irrigation, a recommended management practice, had a robust negative effect on ratoon tillers and yield under both the conditions. Positive large effects were shown in the bad condition only. Discussion: Our results show that the SALIBU cropping method includes practices with unstable, negative, or minimal effects. The practices have unstable effects should be clarifying the interaction with the condition. The practices that have negative effects should exclude. Using practice on small effect size should depend on a cost-benefit analysis. Conclusions: SALIBU will be acceptable to the Mekong Delta triple cropping rice cultivation without the additional practice of original SALIBU cropping method. However, further work is needed to clarify the interaction between late cutting and the cultivation condition, and on the negative effect of late irrigation.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%