Abstract
In northern Laos, upland rice is grown as a subsistence crop under rainfed conditions with no fertilizer inputs. It has traditionally been grown under slash-and-burn systems with long fallows, which restore soil fertility and reduce insect and weed pressure. However, increasing population density and government policies aimed at reducing the area under slash-and-burn have reduced fallows to as little as two or three years between rice crops. In this paper the impact of intensifying upland rice cultivation and rainfall on upland rice productivity was evaluated using yield and rainfall data from Luang Prabang province from 1992 to 2004. In addition, an experiment was conducted in 2004 to evaluate the effect of upland rice cropping intensification on soil nitrogen (N) and phosphate (P) availability and root pests (Tetraneura nigriabdominalis-root aphids and Meloidogyne graminicola Golden & Birchfield-nematodes). Rice yields were associated with total rainfall from June through August, corresponding to mid-tillering through flowering growth stages of upland rice. Increased cropping intensity resulted in a significant reduction of upland rice yields with higher rice yields being associated with longer fallows. Furthermore, when rice was annually cropped in the same field without fallows, rice yields rapidly declined. A study conducted in 2004 indicated that increasing cropping intensity reduced the soil N and P availability and increased root aphid infection of rice. The long-term productivity of upland rice can not be sustained with increased cropping intensity using the current management practices. Therefore, improved crop and resource management technologies are necessary for sustainable production.
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References
InstitutionalAuthorNameAsian Development Bank (2001) Participatory poverty assessment: Lao PDR Asian Development Bank Vientiane, Laos 187
M Becker DE Johnson (2001) ArticleTitleCropping intensity effects on upland rice yield and sustainability in West Africa Nutr cycl Agroecosys 59 107–117 Occurrence Handle10.1023/A:1017551529813
CI Evensen TS Diefolf RS Yost (1995) ArticleTitleDecreasing rice and cowpea yields in alley cropping on a highly weathered Oxisol in West Sumatra, Indonesia Agroforest Syst 31 1–19 Occurrence Handle10.1007/BF00712052
S Funakawa S Tanaka H Shinjyo T Kaewkhongkha T Hattori K Yonebayashi (1997) ArticleTitleEcological study on the dynamics of soil organic matter and its related properties in shifting cultivation systems of northern Thailand Soil Sci Plant Nutrition 43 681–693 Occurrence Handle1:CAS:528:DyaK2sXmt1yisb8%3D
T George R Magbanua DP Garrity BS Tubaña J Quiton (2002) ArticleTitleRapid yield loss of rice cropped successively in aerobic soil Agron J 94 981–989 Occurrence Handle10.2134/agronj2002.0981
PC Gupta JC O’Toole (1986) Upland rice: a global perspective IRRI Manila, Philippines 360
Hidaka S (1997) Nitrogen. In: Committee for Standard Methods of Soil Environment Analyses, (eds) Standard method of soil environment analyses. Japanese Society of Soil Science and Plant Nutrition. Hakuyu-sha, Tokyo, pp 231–255. (in Japanese).
K Kyuma C Pairintra (1983) Shifting cultivation. An experiment at Nam Phrom, Northeast Thailand, its implications for upland farming in the Monsoon Tropics Faculty of Agriculture, Kyoto University Japan 219
Lao-IRRI (1992–2003) Annual Technical Report, National Rice Research Program and Lao-IRRI project, Vientiane, Laos.
Linquist B, Saito K, Keoboualapha B, Phengchan S, Songyikhangsuthor K, Phanthaboon K, Vongphoutone B, Navongsai V, Chindalak S, Horie T (2005) Developing upland rice based cropping systems. In: Bouahom B, Glendinning A, Nilsson S, Victor M (eds) Poverty reduction and shifting cultivation stabilization in the uplands of Lao PDR: technologies, approaches and methods for improving upland livelihoods. Proceedings of a work shop held in Luang Prabang, Lao PDR, 27–30 January 2004, National Agriculture and Forestry Research Institute. Vientiane, Lao PDR, pp 299–313.
Listinger JA, Barrion AT, Sockarna D (1986) Upland rice insect pests: their ecology, importances and control. In: IRRI (ed) Progress in upland rice research. Proceedings of the 1985 Jakarta Conference in Indonesia, 4–8 March 1985, Los Banos, Philippines, pp 403–445.
Maclean JL, Dawe DC, Hardy B, Hettel GL (eds) (2002) Rice Almanac. Los Baños (Philippines): International Rice Research Institute, Bouake (Côte d’Ivoire): West Africa Rice Development Association, Cali (Colombia): International Center for Tropical Agriculture, Rome (Italy): Food and Agriculture Organization, p 253.
JA Malabuyoc JG Real SK Datta ParticleDe (1993) ArticleTitleGrain yield as a function of rainfall, soil moisture and solar radiation in upland rice (Oryza sativa L.) Field Crops Res 34 37–45 Occurrence Handle10.1016/0378-4290(93)90109-Z
Nanjo M (1997) Available phosphate. In: Committee for Standard Methods of Soil Environment Analyses, (eds) Standard method of soil environment analyses. Japanese Society of Soil Science and Plant Nutrition. Hakuyu-sha, Tokyo, pp 231–255 (in Japanese).
InstitutionalAuthorNameNational Statistical Center (2004) Statistical yearbook 2003 Vientiane Laos 144
PH Nye DJ Greenland (1960) The soil under shifting cultivation. Commonwealth Bureau of Soils Technical communication No. 51 Commonwealth Agricultural Bureaux Farnham, UK 156
W Roder (2001) Slash-and-burn rice systems in the hills of Northern Laos PDR: description, challenges, and opportunities International Rice Research Institute Los Baños, Philippines 201
W Roder B Keoboulapha S Phengchanh JC Prot D Matias (1998a) ArticleTitleEffect of residue management and fallow length on weeds and rice yield Weed Res. 38 167–174 Occurrence Handle10.1046/j.1365-3180.1998.00077.x
W Roder B Keoboulapha K Vannalath B Phouaravanh (1996) ArticleTitleGlutinous rice and its importance for hill farmers in Laos Econ Bot 50 401–408
W Roder S Maniphone B Keoboulapha (1998b) ArticleTitlePigeon pea for fallow improvement in slash-and-burn systems in the hills of Laos Agroforest Syst 39 45–57 Occurrence Handle10.1023/A:1005918316157
W Roder S Phengchanh B Keoboulapha (1995a) ArticleTitleRelationships between soil, fallow period, weeds and rice yield in slash-and-burn systems of Laos Plant Soil 176 27–36 Occurrence Handle1:CAS:528:DyaK2MXot1OltbY%3D Occurrence Handle10.1007/BF00017672
W Roder S Phengchanh B Keoboulapha (1997a) ArticleTitleWeeds in slash-and-burn rice fields in northern Laos Weed Res 37 111–119 Occurrence Handle10.1046/j.1365-3180.1996.d01-6.x
W Roder S Phengchanh S Maniphone (1997b) ArticleTitleDynamics of soil and vegetation during crop and fallow period in slash-and-burn fields of northern Laos Geoderma 76 131–144 Occurrence Handle10.1016/S0016-7061(96)00100-0
W Roder S Phengchanh B Keoboulapha S Maniphone (1995b) ArticleTitleChromolaena odorata in slash-and-burn rice systems of Northern Laos Agroforest Syst 31 79–92 Occurrence Handle10.1007/BF00712056
K Saito B Linquist B Keobualapha K Phanthaboon T Shiraiwa T Horie (2006) ArticleTitleStylosanthes guianensis as relay intercrop for improving the productivity of upland rice cropping systems in northern Laos Field Crops Res 96 438–447 Occurrence Handle10.1016/j.fcr.2005.09.005
PA Sanchez (1976) Properties and management of soils in the tropics Wiley New York 618
PA Sanchez DE Bandy JH Villachia JJ Nicholaides (1982) ArticleTitleAmazon Basin soils: management for continuous crop production Science 216 821–827 Occurrence Handle1:CAS:528:DyaL38XktVGhtL8%3D Occurrence Handle17819134
J Schiller B Linquist K Douangsila P Inthapanya B Douang Boupha S Inthavong P Sengxua (2001) Constraints to rice production systems in Laos S Fukai J Basnayake (Eds) Increased lowland rice production in the Mekong region Proceedings of an International Workshop Vientiane, Laos 3–19
Troesch K (2003) Highland rice paddy development in mountainous regions of Northern Lao PDR. Draft report. Swiss College of Agriculture, p 129
Van Keer K (2003) On-farm agronomic diagnosis of traditional upland rice swidden cropping systems in Northern Thailand. Ph. D. Thesis, Katholieke Universiteit Leuven, p 220
K Keer ParticleVan G Trébuil E Gozé (2000) ArticleTitleIdentifying and grading limiting factors of upland rice yields in farmers’ fields of northern Thailand Int Rice Res Notes 25 31–33
Van Reuler H (1996) Nutrient management over extended cropping periods in the shifting cultivation system of South-West Côte d’Ivoire. Ph. D. Thesis, Landbouw Universiteit Wageningen, p 189
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Saito, K., Linquist, B., Keobualapha, B. et al. Cropping intensity and rainfall effects on upland rice yields in northern Laos. Plant Soil 284, 175–185 (2006). https://doi.org/10.1007/s11104-006-0049-5
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DOI: https://doi.org/10.1007/s11104-006-0049-5