Abstract
In West Sumatra, Indonesia, a high-yield perennial rice cropping method called SALIBU was recently reported, in which the most unique feature is double cutting (DC) at harvest and after harvest. The objective of this study was to verify the ratooning rice yield under the SALIBU system in Myanmar. Two cultivation trials consisting of two cutting and three moisture treatments were conducted in 2019 and 2020. We concluded that double cutting had no positive effect on grain yield and regeneration rate compared with single cutting (SC). For the cutting regime, significant results were detected in the ratoon crops on yield components, but all of these were negative effects of DC, and were statistically lower than those of SC. On the other hand, a significant positive effect of moisture regime on grain yield in all ratoons was observed. The grain yield of the dry regime was significantly increased by 69% compared with that of the saturated regime. Soil oxidation conditions during the initial growth period of ratoons could contribute to the improved yield performance of the ratoons.
Highlights
Ratoon rice cropping is a cultivation technology that has the potential to increase annual rice production per unit land area [1]
Many studies have concluded that ratoon rice exhibits a low-yield performance, approximately 40–60% that of the main crop [5,6]; low and unstable grain yield has limited the wide adoption of ratoon cropping
M3, dry conditions (Figure 1a), because it was difficult to adjust the water table in the tanks, so the moisture regime for R1-1 was defined as M1, M1.5, and M2 based on the observed water potential values
Summary
Ratoon rice cropping is a cultivation technology that has the potential to increase annual rice production per unit land area [1]. Compared with traditional double cropping rice systems, ratoon rice cropping can save labor, time, seed, and water, and requires neither nursery supplies nor land preparation [2]. The labor and seed inputs for ratoon rice cropping were reduced by 29% and 52%, respectively, compared with double cropping systems [3,4]. Erdiman et al [7] reported a main crop yield of 6 ton ha−1 , while ratoon rice under the SALIBU system harvested six consecutive times yielded 6–7 ton ha−1. This is probably because ratoon cropping with the SALIBU system has been performed under ideal cultivation conditions, using suitable varieties and best management practices
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