Cropping intensity and rainfall effects on upland rice yields in northern Laos

Saito, Kazuki; Keobualapha, B.; Phanthaboon, K.; Shiraiwa, Tatsuhiko; Horie, Takeshi

doi:10.1007/s11104-006-0049-5

Cited by 54 publications

(49 citation statements)

References 14 publications

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“…Higher grain yield in Mout was associated with higher extractable soil P, a fi nding that is consistent with others (George et al, 2001;Saito et al, 2006bSaito et al, , 2007. Height of maize was more than 100 cm at 37 DAS, and much higher than that of rice.…”

Section: Resultssupporting

confidence: 90%

Genotypic Variation in Ability to Recover from Weed Competition at Early Vegetative Stage in Upland Rice

Saito

Phanthaboon²,

Shiraiwa

et al. 2010

Plant Production Science

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Section: Resultssupporting

confidence: 90%

Genotypic Variation in Ability to Recover from Weed Competition at Early Vegetative Stage in Upland Rice

Saito

Phanthaboon²,

Shiraiwa

et al. 2010

Plant Production Science

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“…Furthermore, the mechanism of adaptation involving crops and rice varieties remains unclear, and thus requires further research. Finally, it should be noted that the optimum selection of crops or varieties should only be seen as one strategy for improving upland rice-based cropping systems, as higher crop productivity can lead to greater nutrient withdrawal and soil degradation (Saito et al 2006b, Asai et al 2007). Therefore, integrated soil fertility management practices and land use management need to be developed for the effective use of upland crops and upland rice varieties with different levels of adaptability to soil conditions.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…On-farm studies have indicated that yield performance varies widely from nothing to 4 t ha -1 in the case of upland rice (Roder et al 1995, Saito et al 2006b, Asai et al 2009b. Unstable production has been attributed to environmental heterogeneity, as well as insufficient and irregular rainfall (Roder 2001, Linquist et al 2006, Saito et al 2006b). Furthermore, rapid population growth combined with government policies for forest conservation no longer support traditional S&B agriculture with long fallow periods, which has consequently resulted in fallow shortening from 40 years in the 1970s to 5 years by 1992 (Roder et al 2001), and then to 2 to 3 years in the 2000s in some areas (Linquist et al 2007).…”

Section: Introductionmentioning

confidence: 99%

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Yield Performance of Upland Rice, Maize and Job’s Tears in a Rainfed Upland Ecosystem in Mountainous Laos

Asai

Soisouvanh

2017

JARQ

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30% in the northern part (Inoue et al. 2005). Recent estimates indicated that 17% of the Laotian people still live in S&B agricultural areas, which cover 29% of the country (Messerli et al. 2009). Although the overall time trend variations in the extent of S&B agriculture have exhibited a gradual decrease at the national level, it still persists or has increased in certain rural areas, where the local poverty rate is considerably higher than the national JARQ 51 (4), 309-318 (2017) AbstractAdaptability to a wide range of environmental factors is a key for achieving stable production in the slash-and-burn (S&B) agriculture of mountainous Laos, where soil varies widely in productivity. Adaptability assessment based on the genotype by environment (GxE) interaction of grain yields in this study entailed an investigation of the yield performance of maize, Job's tears, and seven varieties of upland rice including improved variety B6144F-MR-6-0-0 (B6144), at eleven locations under rainfed upland conditions. Across the eleven locations, the mean yields of upland rice ranged widely from 56 to 583 g m -2 . While the GxE interaction was significant, one improved indica variety (B6144) produced high grain yields at all eleven locations. Under low-yielding conditions (56 to 205 g m -2 of upland rice), four indica varieties consistently performed with more stable yield performance than three tropical japonica varieties, the poor adaptation of which was attributed to reduced grain number per panicle and the grain-filling ratio. Under moderate-and high-yielding conditions (284 to 583 g m -2), two semi-dwarf varieties -Tampi (tropical japonica) and B6144 (indica) -exhibited the highest productivity due to a higher harvest index (0.40-0.41) compared with the others (0.28 -0.34), but B6144 likely exhibited lodging signs under fertile soil conditions, where the mean yields were above 360 g m -2 . The GxE interaction effect was highly significant among the three upland crops; relative to upland rice, maize was particularly better adapted to moderate-and high-yielding conditions, whereas Job's tears adapted better to low-yielding conditions. Job's tears exhibited stable yield performance across all eleven locations. In contrast, maize had higher yield compared with all upland rice varieties under the adapted conditions, although the upland rice varieties had higher yields compared with maize under unadapted conditions. In conclusion, Job's tears or indica varieties are recommended for growth under low-yielding conditions, and maize or semi-dwarf cultivars are recommended under high-yielding conditions. And with possibly more lodging resistance, the improved indica variety B6144 could be the ideal variety adaptable to a wide range of soil fertility.

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“…According to Sarker et al (2012), the influences of maximum temperature and minimum temperature are more pronounced compared with that of rainfall. Climate, particularly rainfall, was identified as the critical determinant of the productivity of upland rice (Gupta and Toole, 1986;Nokkoul and Wijitparp, 2013;Saito et al 2006). Rainfall at different phenological stages has differential impact on yield of rice crop.…”

Section: Introductionmentioning

confidence: 99%

Effect of weather on grain yield of direct seeded upland rice varieties in Jharkhand, India

Kumari

Kumar

et al. 2017

IJARe

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The study was conducted at Birsa Agricultural University, Ranchi during the years 2009-2013 for understanding the effect of weather variables on the yield of three direct seeded upland rainfed rice varieties viz., Vandana, BVD-109 and BVD-111 in Jharkhand. Correlation and regression methods were used to estimate the impacts of weather on rice yield. Study indicated that temperature, rainfall and sunshine hours have significant effect on the rice yield. Average minimum temperature during sowing to vegetative stage in cv. Vandana and during flowering in BVD-109 and BVD-111 showed significant negative relationship with yield. Rainfall during vegetative and grain filling stage are significantly and positively related with grain yield in all the three rice varieties. The effect of sunshine hours on grain yield of rice was comparatively higher at milk stage than the other phenological stages in all three varieties. However, the effect of sunshine hours on yield is significant during the milk stage in Vandana and BVD-111 only. Multiple regressions using critical weather parameters in critical stages of the three varieties could explain the variability in yield of Vandana, BVD-109 and BVD-111 by 92, 74 and 91 percent, respectively.

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Cropping intensity and rainfall effects on upland rice yields in northern Laos

Cited by 54 publications

References 14 publications

Genotypic Variation in Ability to Recover from Weed Competition at Early Vegetative Stage in Upland Rice

Genotypic Variation in Ability to Recover from Weed Competition at Early Vegetative Stage in Upland Rice

Yield Performance of Upland Rice, Maize and Job’s Tears in a Rainfed Upland Ecosystem in Mountainous Laos

Effect of weather on grain yield of direct seeded upland rice varieties in Jharkhand, India

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