tailieunhanh - Effect of nitrogen application levels on growth of rice under drought stress conditions

effect of nitrogen application levels on growth of rice under drought stress conditions. The aim of this study was to investigate effects of nitrogen (N) application on root system development, photosynthetic rate and dry matter production under different drought stress conditions. The experiments were conducted in a line source sprinkler system creating a soil moisture gradient under a rain-out shelter | J. Sci. & Devel. 2015, Vol. 13, No. 8: 1388-1396 Tạp chí Khoa học và Phát triển 2015, tập 13, số 8: 1388-1396 EFFECT OF NITROGEN APPLICATION LEVELS ON GROWTH OF RICE UNDER DROUGHT STRESS CONDITIONS Tran Thi Thiem1*, Yamauchi Akira2 1 Faculty of Agronomy, Vietnam National University of Agriculture 2 Graduate School of Bioagricultural Sciences, Nagoya University Email*: tranthiem@ Received date: Accepted date: ABSTRACT The aim of this study was to investigate effects of nitrogen (N) application on root system development, photosynthetic rate and dry matter production under different drought stress conditions. The experiments were conducted in a line source sprinkler system creating a soil moisture gradient under a rain-out shelter. Three N -1 fertilizer treatments were applied: 60, 120 and 180 kg N ha . Nitrogen fertilizer was mixed well with phosphorus and -1 potassium fertilizer at the rate of 50 kg (P and K) ha and applied as basal dressing at 8 days after transplanting. The -1 obtained results showed that increase of N level from 60 to 120 kg N ha increased total root length and shoot dry weight of Nipponbare under severe drought stress conditions (25% w/w of SMC) conditions, total root length increased with increased N application leading to increase stomatal conductance and photosynthetic rate, and eventually increased shoot dry weight. In addition, only under well-watered conditions the relationship between the total root length and shoot dry -1 -1 weight was positive and notably significant at 120 and 180 kg N ha levels but not at 60 kg N ha level. The -1 experiment suggested that the nitrogen application levels of 120 and 180 kg N ha increased the dry matter production due to the increased total root length under well-watered conditions. Keywords: Drought, dry matter production, nitrogen, rice, root. Ảnh hưởng của mức đạm bón đến sinh trưởng của cây lúa trong các điều kiện hạn khác nhau TÓM TẮT Nghiên .

• Nông nghiệp
• Effect of nitrogen application
• Dry matter production
• Nitrogen application levels on growth of rice
• Growth of rice under drought stress conditions
• Drought stress conditions
• Nitrogen time of application
• Nitrogen method of application
• Time nitrogen fertilizer application
• Growth and yield of grain sorghum
• Grain sorghum
• Nitrogen levels
• Time of application
• Barley (Hordeum vulgare L
• Application on yield attributes
• Head rice recovery
• Protein content
• Soil microbial activities
• Effect of irrigation scheduling
• Nitrogen application on yield
• Split application
• Garlic (Allium sativum L )
• Different levels of nitrogen
• Methods of application on growth
• Yield of garlic
• Black cumin
• Inorganic fertilizer
• Nitrogen and phosphorous fertilizer application
• Yield of black cumin cultivation
• Phosphorous fertilizer application
• Camelina sativa
• Nitrogen dose
• Nitrogen scheduling
• Newly introduced biofuel crop
• Camelina sativa L
• Tuber yield
• Nitrogen and potassium
• Potassium on growth
• Yield of potato
• Solanum tuberosum L
• Triticum aestivum L
• Triticum aestivum
• Productivity of wheat
• Herbicide application
• Nitrogen management on growth
• Polymer coated urea (PCU)
• Normal urea
• Slow releasing fertilizer
• Rice (Oryza sativa L )
• Growth and yield of rice
• Nitrogen application on growth
• Age of seedling
• Split application of N
• Productive tillers
• Stem borer incidence
• Foliar application
• Boron in sunflower
• High crop yield
• Sulphur containing fertilizers
• Nitrogen application
• Coastal areas
• Irrigation levels
• Production potential of sorghum
• Sorghum (Sorghum bicolor L
• Levels of nitrogen
• Zinc on growth
• Yield of hybrid maize
• Basal application of P2O5
• Grain yield was recorded
• Nitrogen fertilization
• Leaf area
• Yield attributes
• Seed yield of rapeseed variety
• Lower seed yield of rapeseed
• Biogas waste
• Effective efficiency
• Lady finger
• Organic farming
• Nitrogen fertilizer
• Balanced fertilization
• Aerobic rice
• Organic amendments
• Rice wheat cropping
• Water stable aggregates
• Aerobically grown basmati rice
• Azolla incorporation
• Chemical fertilizers
• Integrated nutrient management
• Acidic soil of Meghalaya
• Polymer coated urea
• Wheat (Triticum aestivum L )
• Growth and yield of wheat