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Röder, W.; Maniphone, S.

doi:10.1023/a:1005958729929

Cited by 8 publications

(2 citation statements)

References 11 publications

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“…The paper mulberryupland rice rotation system improves the productivity of a traditional slash-and-burn system through harvesting paper mulberry inner bark; however the longIntroduction Slash-and-burn upland rice remains the dominant land-use system in the mountainous region of northern Laos. Farmers in this region have depended on perennial species to suppress weeds and rejuvenate soil fertility during the fallow period as well as to provide daily necessities such as food and firewood (Roder 2001). Rapid population growth and government policies aimed at protecting forests no longer permit traditional slash-and-burn management with long fallows and this has resulted in increased cropping intensity; increased weed and pest pressure; and consequently lowered rice yields (Roder 2001;Saito et al 2006).…”

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“…Farmers in this region have depended on perennial species to suppress weeds and rejuvenate soil fertility during the fallow period as well as to provide daily necessities such as food and firewood (Roder 2001). Rapid population growth and government policies aimed at protecting forests no longer permit traditional slash-and-burn management with long fallows and this has resulted in increased cropping intensity; increased weed and pest pressure; and consequently lowered rice yields (Roder 2001;Saito et al 2006). These shortened fallows using traditional management practices are not sustainable and the development of stable alternatives is required.…”

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Broussonetia papyrifera (paper mulberry): its growth, yield and potential as a fallow crop in slash-and-burn upland rice system of northern Laos

Saito

Keobualapha²,

Shiraiwa

et al. 2009

Agroforest Syst

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In northern Laos, shortened fallows in the slash-and-burn upland rice system are not sustainable either from a production or economic standpoint. This paper evaluates the potential for using the indigenous fast-growing tree, Broussonetia papyrifera L. Vent. (paper mulberry) as an economic fallow crop. The objectives of this study are to assess the inner bark yield of paper mulberry, and to evaluate rice productivity following paper mulberry cultivation. In addition, allometric models for estimating the inner bark yield of paper mulberry are developed. Inner bark yield of paper mulberry stands ranging in age from 9 to 48 months ranged from 10 to 208 g m -2 , and increased with age. The models using diameter at breast height and stem height, or diameter at breast height only as independent variables explained well the variation in inner bark yield. When paper mulberry was completely removed during the rice growing season, rice yields in these areas were similar to those following weedy bush fallow. When paper mulberry was allowed to grow, rice yields were negatively correlated to paper mulberry stem density. When paper mulberry lateral branches were pruned back, rice yields could be maintained if the paper mulberry stem density was\0.22 stems m -2 , suggesting that if paper mulberry is managed properly, rice yields can be maintained at current levels. The paper mulberryupland rice rotation system improves the productivity of a traditional slash-and-burn system through harvesting paper mulberry inner bark; however the longterm sustainability of such a system remains unclear and warrants further investigation.

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confidence: 99%

mentioning

confidence: 99%

Broussonetia papyrifera (paper mulberry): its growth, yield and potential as a fallow crop in slash-and-burn upland rice system of northern Laos

Saito

Keobualapha²,

Shiraiwa

et al. 2009

Agroforest Syst

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Conservation Agriculture in Southeast Asia

Legoupil

Lienhard

Khamhoung³

2014

Conservation Agriculture

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Planted legume fallows reduce weeds and increase soil N and P contents but not upland rice yields

Saito

Johnson

Phengchanh³

et al. 2008

Agroforest Syst

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Shortened fallows have resulted in declining upland rice yields in slash-and-burn upland rice systems in northern Laos. We studied the benefit of planted legume fallows for rice productivity, weeds, and soil nitrogen and phosphorus availability. Four systems were evaluated over a 5-year period: 1-year fallow with native species, 1-year Cajanus cajan fallow, 1-year Leucaena leucocephala fallow, and continuous annual rice cropping. Rice was grown either once each year as continuous annual cropping or in alternate years of 2001, 2003, and 2005. C. cajan and L. leucocephala were sown with rice during the 2001 growing season. In subsequent years, L. leucocephala regenerated from root stock and did not have to be resown, whereas C. cajan was resown in 2003. Establishment of either C. cajan or L. leucocephala had no significant effect on rice yield in 2001, and rice yields ranged from 2.0 to 2.3 t/ha. Rice yields declined rapidly in succeeding years, and rice yields in the four systems ranged from 0.7 to 1.1 t/ha in 2003 and from 0.3 to 0.5 t/ha in 2005. Although two planted fallow systems increased nitrogen input because of greater biomass accumulation in 2003 and 2005 and soil phosphorus availability was higher following L. leucocephala fallow in 2005, there were no significant differences in rice yields among the four systems in either year. Weed biomass during the rice growing season increased each year in all systems and increased more rapidly for continuous annual rice cropping, in which the dominant weed species was Ageratum conyzoides L. Among the other three systems, there were no significant differences in the weed biomass in 2003 and 2005. We conclude that C. cajan and L. leucocephala as 1-year fallows do not offset the negative effects of increased cropping intensity on rice yield in this region.

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Cited by 8 publications

References 11 publications

Broussonetia papyrifera (paper mulberry): its growth, yield and potential as a fallow crop in slash-and-burn upland rice system of northern Laos

Broussonetia papyrifera (paper mulberry): its growth, yield and potential as a fallow crop in slash-and-burn upland rice system of northern Laos

Conservation Agriculture in Southeast Asia

Planted legume fallows reduce weeds and increase soil N and P contents but not upland rice yields

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