IRRN GUIDELINES The International Rice Research Guidelines for contributors environment (irrigated, rainfed Categories of research published Newsletter objective is: (revised) lowland, upland, deepwater, tidal "To expedite communication wetlands). GERMPLASM IMPROVEMENT among scientists concerned with The International Rice Research • Specify the type of rice culture genetic resources the development of improved Newsletter is a compilation of brief (transplanted, wet seeded, dry genetics technology for rice and for rice- reports of current research on topics seeded). breeding methods based cropping systems. This of interest to rice scientists all over • Specify seasons by characteristic yield potential publication will report what the world. Contributions should be weather (wet season, dry season, grain quality scientists are doing to increase the reports of recent work and work-in- monsoon) and by months. Do not pest resistance production of rice, inasmuch as progress that have broad, pan-national use local terms for seasons or, if diseases this crop feeds the most densely interest and application. Only reports used, define them. insects populated and land-scarce nations of work conducted during the • Use standard, internationally other pests in the world ... IRRN is a immediate past three years should be recognized terms to describe rice stress tolerance mechanism to help rice scientists submitted. plant parts, growth stages, drought keep each other informed of environments, management excess water current research findings." Research reported in IRRN should be practices, etc. Do not use local adverse temperature The concise reports contained in verified. Single season, single trial names. adverse soils IRRN are meant to encourage rice field experiments are not accepted. • Provide genetic background for integrated germplasm improvement scientists and workers to com- All field trials should be repeated new varieties or breeding lines. irrigated municate with one another. In this across more than one season, in • For soil nutrient studies, be sure to rainfed lowland way, readers can obtain more detailed multiple seasons, or in more than one include a standard soil profile upland information on the research reported. location, as appropriate. All description, classification, and deepwater Please examine the criteria, experiments should include relevant soil properties. tidal wetlands guidelines, and research categories replication and a check or control • Provide scientific names for seed technology that follow. treatment. diseases, insects, weeds, and crop If you have comments or plants. Do not use common names CROP AND RESOURCE suggestions, please write the editor, All work should have pan-national or local names alone. MANAGEMENT IRRN, IRRI, P.O. Box 933, Manila, relevance. • Quantify survey data (infection soils Philippines. We look forward to your percentage, degree of severity, soil microbiology continuing interest in IRRN. Reports of routine screening trials of sampling base. etc.). physiology and plant nutrition varieties, fertilizer, and cropping • When evaluating susceptibility, fertilizer management Criteria for IRRN research reports methods using standard methodolo- resistance, tolerance, etc.. report inorganic sources • has international, or pan-national, gies to establish local recommenda- the actual quantification of damage organic sources relevance tions are not accepted. due to stress that was used to crop management • has rice environment relevance assess level or incidence. Specify integrated pest management • advances rice knowledge Normally, no more than one report the measurements used. diseases • uses appropriate research design will be accepted from a single • Use generic names, not trade insects and data collection methodology experiment. Two or more items about names, for all chemicals. weeds • reports appropriate, adequate data the same work submitted at the same • Use international measurements. other pests • applies appropriate analysis, using time will be returned for merging. Do not use local units of measure. water management appropriate statistical techniques Submission at different times of Express yield data in metric tons farming systems • reaches supportable conclusions multiple reports from the same per hectare (t/ha) for field studies farm machinery experiment is highly inappropriate. and in grams per pot (g/pot) or per postharvest technology Detection of such submissions will specified length (in meters) row (g/ economic analysis result in rejection of all. row) for small scale studies. • Express all economic data in terms ENVIRONMENT Please observe the following of the US$. Do not use local guidelines in preparing submissions: monetary units. Economic SOCIOECONOMIC IMPACT • Limit each report to two pages of information should be presented at double-spaced typewritten text and the exchange rate US$:local EDUCATION AND no more than two figures (graphs, currency at the time data were COMMUNICATION tables, or photos). collected. • Do not cite references or include a • When using acronyms or RESEARCH METHODOLOGY bibliography. abbreviations, write the name in • Organize the report into a brief full on first mention, followed by statement of research objectives, a the acronym or abbreviation in brief description of project design, parentheses. Thereafter, use the and a brief discussion of results. abbreviation. Relate results to the objectives. • Define any nonstandard abbrevia- • Report appropriate statistical tions or symbols used in a table or analysis. graph in a footnote or caption/ • Specify the rice production legend. CONTENTS GERMPLASM IMPROVEMENT CROP AND RESOURCE MANAGEMENT Genetic resources Soil microbiology 5 Sheath blight (ShB) resistance in wild rices 22 Influence of wild plant and crop residues on rice yield 5 Panicle and grain characters of some glaberrima cultivars in Sierra Leone 22 Effect of seeding rate on dry matter production and nitrogen accumulation of Sesbania rostrata Genetics 6 Inheritance of response to gibberellic acid (GA3) in semidwarf rices Physiology and plant nutrition 23 Effects of a growth regulator on rice seedling growth Breeding methods 7 A high-yielding early hybrid rice with multiple resistance Fertilizer management 7 Effect of gibberellic acid on pathogen infection in hybrid rice seed 23 Greenhouse evaluation of urea supergranules (USG) containing 8 Screening rices for good panicle exsertion diammonium phosphate (DM) for transplanted rice 24 Rate and time of N application for direct seeded irrigated rice Yield potential 25 Influence of modified urea and placement on N use in irrigated rice 8 Genetic studies on rice flag leaf weight and midrib and side vein thickness 25 Influence of modified urea materials at different N rates on estimated 9 Photoperiod sensitivity of traditional rice variety of Andamans wetland rice soil ammonium-N and nitrate-N 9 Association of rice ratooning ability and vigor with grain yield 26 Contribution of flood siltation to boro rice yield and response to N and K 10 Effect of leaf senescence and stubble carbohydrate content on ratoon 27 Response of rice to Azospirillum brasilense and organic manures on rice yield organic- and chemical-few farms in India 10 Effect of high humidity and low temperature on spikelet fertility in indica rice Crop management 28 Effect of traditional and improved nursery methods on seedling growth Pest resistance—diseases and rice yield 11 Some components of partial resistance to blast (B1) in indica rices 12 Analysis of rice blast (Bl) pathogen virulence in Egypt Integrated pest management—diseases 12 Resistance to blast (Bl) in Egyptian rice varieties 28 Nonfluorescent Pseudomonas strains causing rice sterility and grain 13 Changes in rice leaf pigment due to tungro (RTV) infection discoloration in Colombia 13 Development of kresek symptoms on some rice varieties 29 False smut incidence on rice relative to plant characters and environmental 14 Resistance of wild rices to bacterial blight (BB) factors 30 Bakanae and foot rot of rice in Punjab, Pakistan Pest resistance—insects 30 Efficacy of ethofenprox in preventing rice tungro (RTV) infection 14 Biology of rice leaffolders (LF) on susceptible IR36 and resistant TKM6 15 Rearing yellow stem borer (YSB) for screening varietal resistance Integrated pest management—insects 15 MDU3, a new gall midge-resistant rice 30 Mutual interference among wolf spider adult females 16 Using rice nurseries to collect thrips for use in screening rice germplasm 31 Fluctuation of yellow stem borer (YSB) populations in Raichur, Kamataka, India Pest resistance—other pests 31 Toxicity of insecticides to mirid bug predator of rice brown planthopper 16 Reaction of rice cultivar Faro 11 to sugarcane cyst nematode Heterodera 31 Feeding and food assimilation by two species of rice leaffolders (LF) on sacchari selected weed plants 32 Mass rearing of a mirid predator Stress tolerance—adverse temperature 17 Promising cold-tolerant and high-yielding rice lines for Ndop Plain, Integrated pest management—weeds Northwest Camemon 33 Weed control in dry and wet seeded irrigated rice 18 Performance of cold-tolerant varieties in western hills of Nepal 33 Effect of time and number of weedings on direct seeded upland rice yields 18 Screening rice for temperature tolerance in northern Nigeria 34 Weed composition in dry seeded wetland rice Stress tolerance—adverse soils Farming systems 19 Phosphorus activity in genotypes with low phosphoms tolerance 34 Intercropping following rice 34 Rice-based