Farmers' knowledge of soils in relation to cropping practices: A case study of farmers in upland rice based slash-and-burn systems of northern Laos

Saito, Kazuki; Linquist, Bruce A.; Keobualapha, B.; Shiraiwa, Tatsuhiko; Horie, Takeshi

doi:10.1016/j.geoderma.2006.02.003

Cited by 69 publications

(58 citation statements)

References 25 publications

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“…As was observed in this study, indica varieties in the tropics had in common vigorous tillering traits with small-sized grains (Takahashi 1984). Most farmers believed that the small-grain variety can adapt well to poor soils (Saito et al 2006c). In a germplasm survey where 244 accessions were collected from northern, central and southern Laos, Asai et al (2016) also found from their collected dataset that good tillering ability and small grain size were significantly effective indicators of genotypic adaptability to infertile soil conditions.…”

Section: Discussionsupporting

confidence: 70%

“…Alternative options could be the production of Job's tears in place of maize. The good adaptability to infertile soil conditions and stable yield performance was also recognized by upland farmers with local indigenous knowledge (Saito et al 2006c). Furthermore, upland farmers also regard Job's tear as a crop that requires minimal care for weeding (Douangsavanh & Bouahom 2006).…”

Section: Discussionmentioning

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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Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

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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“…Much of this is well-researched and scholarly work, and fulfils a pressing need to document fully locally-based indigenous knowledge repertoires, but it sometimes can be overly descriptive and too place-specific to be of much wider development value. A second theme, perhaps being promoted as a means of trying to bring IK more into the centre of development practice, has involved work which attempts to validate IK through the use of scientific testing methods (see, for example, Jacobson and Stephens, 2009;Mairura et al, 2008;Saito et al, 2006;Trung et al, 2008). The problem here is that there is the often unsaid assumption that IK can only really be taken seriously when it has the seal of approval of formal science.…”

Section: Introductionmentioning

confidence: 99%

The Resilience of Indigenous Knowledge in Small-scale African Agriculture: Key Drivers

Briggs¹,

Moyo²

2012

Scottish Geographical Journal

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The successful use of indigenous knowledge in development practice in rural Africa over the last couple of decades has proved to be elusive and disappointing. Using empirical field data from northern Malawi, this study suggests that the two key drivers for farmers in this area are household food security and the maintenance of soil fertility. Indigenous ways of knowing underpin the agricultural system which has been developed, rather than the adoption of more modern, 'scientific' ways, to deliver against these drivers. Such indigenous knowledges, however, are deeply embedded in the economic, social and cultural environments in which they operate.

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“…Consequently, no improved upland rice cultivars have been released in this region (Saito et al, 2007). The labor requirement for weeding is typically 150 d ha -1 and about 50% of the total labor input (Roder et al, 1997;Saito et al, 2006a). Saito et al (2006a) reported that in the fi rst two months of the rice growing season, the total labor input was 107 d ha -1 , indicating that two persons have to weed continuously during the fi rst two months (average fi eld size is about 1 ha for rice).…”

mentioning

confidence: 99%

“…The labor requirement for weeding is typically 150 d ha -1 and about 50% of the total labor input (Roder et al, 1997;Saito et al, 2006a). Saito et al (2006a) reported that in the fi rst two months of the rice growing season, the total labor input was 107 d ha -1 , indicating that two persons have to weed continuously during the fi rst two months (average fi eld size is about 1 ha for rice). The two months after rice seeding include a highly critical period for weed competition, when weeds have the greatest effect on rice growth (van Heemst, 1985; 【Short Report】 Fig.…”

mentioning

confidence: 99%

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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Farmers' knowledge of soils in relation to cropping practices: A case study of farmers in upland rice based slash-and-burn systems of northern Laos

Cited by 69 publications

References 25 publications

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

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

The Resilience of Indigenous Knowledge in Small-scale African Agriculture: Key Drivers

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

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