oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 6 )

2018 ( 87 )

2017 ( 79 )

2016 ( 93 )

Custom range...

Search Results: 1 - 10 of 4748 matches for " Aerobic Rice "
All listed articles are free for downloading (OA Articles)
Page 1 /4748
Display every page Item
Impact of integrated package of agrotechniques on growth and yield of aerobic rice  [PDF]
C. M. Sunil, B. C. Shankaralingappa
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.51006
Abstract:

A field experiment was conducted during Kharif, 2011-2012 and 2012-2013 at GKVK, Bengaluru, Karnataka to study the effect of integrated package of agrotechniques on growth and yield of aerobic rice. The predominant weed flora observed in the experimental field were, Eleusine indica, Digitaria marginata L., Dactyloctenium aegyptium L., Alternanthera sessilis, Mollugo distica L., Celosia argentia and Borreria hispida. Treatments receiving integrated weed management practices recorded significantly lower weed population and weed dry weight as compared to pre-emergence application of pyrazosulfuron ethyl alone. Application of RDF + FYM + Biofertilizers + FeSO4 +IWM practices (T8) recorded significantly higher growth, yield parameters and yield as compared to RDF + FYM + IWM practices and was being on par with RDF + FYM + Biofertilizers + IWM practices (T5).

Effect of Varied Irrigation Scheduling with Levels and Times of Nitrogen Application on Yield and Water Use Efficiency of Aerobic Rice  [PDF]
Murugesan Mohana Keerthi, Rajagopalan Babu, Nagalingam Somasundaram Venkataraman, Elangovan Subramanian, Karunanandham Kumutha
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.911165
Abstract: More rice needs to be produced with lesser water to feed the increasing human population. Judicious water management practices and appropriate water saving technologies in rice cultivation are in need in the coming decades. Aerobic rice is one of water saving method of rice cultivation. The field experiment was conducted during Summer season of February 2018 to May 2018 at Tamil Nadu Agricultural University, Agricultural College and Research Institute, Madurai, to find out the effect of irrigation schedules with varied doses and time of nitrogen application on yield of aerobic rice. Irrigation scheduling of IW/CPE (Irrigation Water/Cumulative Pan Evaporation) 1.0 up to panicle initiation stage and thereafter IW/CPE 1.2 up to dough stage recorded higher yield attributes viz., number of panicles hill-1 (9.1), number of filled grains panicle-1 (87.9), test weight (15.3 g), grain yield (4462 kg·ha-1), straw yield (5977 kg·ha-1). However, the highest water use efficiency (6.8 kg·ha-1·mm-1) was recorded in the treatment of IW/CPE 1.0 throughout the crop growth period. Lower yield attributes, yield and water use efficiency were recorded with irrigation scheduling of IW/CPE 0.8 throughout the growth stage. Application of nitrogen at 150 kg·ha-1 in 5 equal splits at 20, 35, 50, 65 and 80 DAS (Days after sowing) recorded higher yield attributes viz., number of panicles hill-1 (9.3), number of filled grains panicle-1 (90.5), test weight (15.4 g), grain yield (4746 kg·ha-1), straw yield (6258 kg·ha-1) and WUE (7.5 kg·ha-1·mm-1). Application of nitrogen 100 kg·ha-1 in 4 equal splits at 20, 40, 60 and 80 DAS recorded lower yield attributes, yield and water use efficiency. The interaction effect between irrigation scheduling and nitrogen management on yield was significant. The combination of IW/CPE 1.0 up to panicle initiation stage and thereafter IW/CPE 1.2 up to dough stage along with application of nitrogen at 150 kg·ha-1 in 5 equal splits at 20, 35, 50, 65 and 80 DAS significantly produced higher number of panicles hill-1 (10.7), grain yield of 5419 kg·ha-1 and straw yield of 6906 kg·ha-1. However, IW/CPE 1.0 throughout the growth period along with application of nitrogen at 150 kg·ha-1 in 5 equal splits at 20, 35, 50, 65 and 80 DAS
Influence of Irrigation Scheduling with Levels and Times of Nitrogen Application on Root Growth of Aerobic Rice  [PDF]
Murugesan Mohana Keerthi, Rajagopalan Babu, Nagalingam Somasundaram Venkataraman, Peyandi Paraman Mahendran
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.911166
Abstract: Aerobic rice is one of the alternative methods for saving water, energy, labour, time and reduced methane gas in rice production ecosystem. The field experimental trial was conducted during summer 2018 at Agricultural College and Research Institute, Madurai. Irrigation scheduling based on different IW/CPE (Irrigation Water/Cumulative Pan Evaporation) ratios and different doses along with various spilt applications of nitrogen were experimented. Results of field experiment indicated that irrigation scheduling at IW/CPE of 0.8 up to panicle initiation stage and thereafter IW/CPE of 1.0 up to dough stage recorded the highest root length of 13.0 cm at active tillering and 18.8 cm at flowering stage. But, irrigating the aerobic rice at IW/CPE of 1.0 up to panicle initiation stage and thereafter IW/CPE of 1.2 up to dough stage recorded the highest root volume (16.9, 27.1 cc·hill-1) and root dry weight (6.1, 12.9 g·hill-1) at active tillering and flowering stage. Application of nitrogen at 150 kg·ha-1 in 5 equal splits at 20, 35, 50, 65 and 80 DAS (Days after sowing) recorded the highest root length of 13.5 cm, root volume of 17.6 cc·hill-1 and root dry weight of 6.4 g·hill-1 at active tillering stage and root length of 19.4 cm, root volume of 27.6 cc·hill-1 and root dry weight of 14.4 g·hill-1 at flowering stage. The interaction effect of irrigation and nitrogen significantly influenced the root growth. Irrigation at IW/CPE of 0.8 up to panicle initiation stage and thereafter IW/CPE of 1.0 up to dough stage along with 150 kg N ha-1 in 5 equal splits at 20, 35, 50, 65 and 80 DAS significantly enhanced the root length (15.7, 23.6 cm) at active tillering and flowering stage. However, irrigation scheduling at IW/CPE of 1.0 up to panicle initiation stage and thereafter IW/CPE of 1.2 up to dough stage along with application of N 150 kg·ha-1 in 5 equal splits at 20, 35, 50, 65 and 80 DAS registered the highest root volume (20.3, 32.8 cc·hill-1) and root dry weight (8.3, 16.4 g·hill-1) at active tillering and flowering stage.
Heterosis under aerobic condition in hybrid Rice
K Amudha, K. Thiyagarajan, S. Robin, Silvas Jeba Kumar Prince, R. Poornima and K.K. Suji
Electronic Journal of Plant Breeding , 2010,
Abstract: An experiment was undertaken to identify heterotic rice hybrids for aerobic condition based on physiological and rootcharacters associated with water stress tolerance in rice. Panicle harvest index, a substitute for spikelet fertility is used as asecondary trait in the selection of drought tolerant genotypes. Deep roots are required to explore the soil profile foreffectively absorbing water at deeper layers. A cultivar which partitions more of its dry weight in root can explore more soilvolume for extracting water and thus can effectively sustain drought. Four hybrids viz., IR 68885A / IR 73718-3-1-3-3, IR67684A / CT-6510-24-1- 2, IR 70369A / IR 73718-3-1-3-3 and IR 70372A/ PSBRC 80 exhibited heterotic vigour for yieldand maximum number of yield components and showed better adaptability to aerobic conditions. These hybrids can becommercially exploited under aerobic condition.
The effect of different water managements on rice arsenic content in two arsenic-spiked soils
Chang H. Y.,Chen Z. S.
E3S Web of Conferences , 2013, DOI: 10.1051/e3sconf/20130115007
Abstract: Growing rice on arsenic (As)-contaminated paddy fields may induce high As level grain production. In order to reduce the food contamination risk, the pot experiments containing two As-spiked aging soils and four water managements were conducted to evaluate the effects of water managements on rice As content. The results indicated that As concentration of Erlin soil solution was 10 to 20 times (210-520 μg/L) higher than that of Pinchen soil solution (5-20 μg/L) at early stage of experiment (0-60 days). Aerobic water treatment will decrease As level to 30-50% (108-220 μg/L) of original As concentration in Erlin soil solution. Statistic results indicated that water management was effective to reduce the rice grain As level in Erlin soil. However, the management impact was not obvious in Pinchen soil, which may be attributed to high clay or free Fe and Al content in the soil. This study suggested that keeping soil under aerobic condition for 3 weeks before rice heading can reduce the risk of rice grown at the As-contamination soil.
Response of rice (Oryza sativa L.) genotypes under aerobic conditions
Keshava Murthy B. C, Arvind Kumar and Shailaja Hittalmani
Electronic Journal of Plant Breeding , 2011,
Abstract: A field experiment was conducted during wet season 2009 to study the response of rice genotypes under aerobic conditions.Variance studies revealed significant differences among the genotypes for the traits, days to flowering, plant height, harvestindex, grain yield, panicle number, straw yield, panicle length, test weight and biomass. Higher values of heritability and geneticadvance were observed for plant height and days to flowering. Grain yield per plot showed positive association with harvestindex and total biomass. Correlation and path analysis revealed an ideal plant type of genotype under aerobic conditions shouldhave high harvest index and biomass. Eight rice genotypes with increased yield advantage over checks have been identified assuitable entries for aerobic cultivation. Results also suggested that all rice genotypes are not suitable for aerobic method ofcultivation and the genotypes which are able to acclimatize to the non-puddled aerobic conditions should be identified andreleased.
Effect of drought on yield potential and drought susceptibility index of promising aerobic rice (Oryza sativa L.) genotypes
Naresh Babu, N., Shailaja Hittalmani, Shivakumar N., Nandini C.
Electronic Journal of Plant Breeding , 2011,
Abstract: Selection of drought tolerance is highly complex and involves evaluating genotypes either for high yield potential or stable performance under varying degrees of water stress. Seventeen advanced rice genotypes were evaluated under aerobic and water stress condition at Department of Genetic and Plant Breeding, GKVK, UAS, Bangalore during summer 2010. Water stress was imposed at late vegetative stage by withholding irrigation supply in one experiment for 15 days and other was maintained as aerobic control. Drought susceptibility index (DSI) and Relative yield (RY) values were used to describe yield stability and relative yield among genotypes. In the present study, there were high variations in drought susceptibility index and relative yield among genotypes. DSI values ranged from -9.37 (25P25) to 18.48 (IR 68897B) and mean RY values were 0.707 and 0.752 for Aerobic condition and water stress respectively. Higher relative yield under water stress indicated the positive response of genotypes to drought. The varieties MAS26, SEL 128, 25P25, PHB 71, MAS25, IR 58025B and MAS946-1 showed high yield potential and yield stability (i. e., DSI < 1 and RY > mean RY). MAS26 and SEL 128 not only have yield stability but they also have high per day productivity per drop of water. So these varieties could be further tested for drought confirming characters and could be used as donor parents in drought tolerance breeding in rice.
Competitiveness of Winter Rice Varieties against Weed under Dry Direct Seeded Conditions  [PDF]
A. N. M. Atikur Rahman, A. K. M. Mominul Islam, Md. Altamas Arefin, Md. Rashedur Rahman, Md. Parvez Anwar
Agricultural Sciences (AS) , 2017, DOI: 10.4236/as.2017.812101
Abstract:
Aerobic rice or dry direct seeded rice is highly vulnerable to weeds because of lack of “head start” over weeds and standing water layer to suppress weeds. The risks of chemical control and the huge cost involvement in mechanical control demand an eco-friendly and cost-effective integrated weed management. Weed competitive rice cultivar may be considered as a viable tool for integrated weed management. In these circumstances, an experiment was designed to evaluate weed competitiveness of some selected winter rice varieties under aerobic soil conditions. The study was conducted during dry season (February to June) 2016 at the Agronomy Field Laboratory and Weed Management Laboratory, Bangladesh Agricultural University, Mymensingh. Fourteen rice varieties namely, BRRI dhan28, BRRI dhan29, BRRI dhan47, BRRI dhan50, BRRI dhan55, BRRI dhan58, BRRI dhan59, BRRI dhan67, Binadhan-5, Binadhan-6, Binadhan-8, Binadhan-10, BRRI hybrid dhan3 and Agrodhan-14 were grown under weedy and weed-free conditions. Plots with no rice were also maintained to observe the natural growth of weed in absence of rice. The experiment was conducted with split-plot design with three replications. Weeding regime was allocated in main plot and rice variety was allocated in sub-plot. Results showed that rice varieties varied widely in their yield performances and weed competitiveness. Among rice varieties, BRRI dhan59 allowed the minimum weed growth (19.2 g m-2) while Binadhan-5 allowed the maximum weed growth (62.8 g m-2). Grain yield ranged from 1.85 t ha-1 (BRRI dhan55) to 3.92 t ha-1 (Binadhan-5) under weed-free condition and between 0.41 t ha-1 (BRRI dhan55) and 2.06 t ha-1 (BRRI dhan59) under weedy condition. Weed inflicted relative yield loss ranged from 43.4% to 82.1% among the varieties. BRRI dhan59 allowed the least yield penalty (43.4%) while Binadhan-5 had the maximum yield penalty (82.1%) due to weed competition. Although Binadhan-5 is the most productive variety (3.92 t ha-1) for aerobic culture but its weed inflicted relative yield loss is higher (82.1%) than many other varieties with low yield potential. On the other hand, BRRI dhan59 appeared as the most weed competitive variety (only 43.4% relative yield loss) with productivity of 3.84 t ha-1. Therefore, weed competitive variety should be considered as a vital tool while designing integrated weed management system for aerobic rice.
Soil water characteristics of farmland of aerobic rice
旱稻农田土壤水分变化特征研究

YANG Jie,YANG Xiao-Guang,WANG Hua-Qi,WANG Pu,Bouman BAM,
杨 婕
,杨晓光,王化琪,王 璞,Bouman B.A.M.

中国生态农业学报 , 2005,
Abstract: 试验研究旱稻不同灌溉处理土壤水分变化特征结果表明,不同供水条件下农田土壤水分变化的主要层次均为80cm以上,120cm以下土层土壤水分处于相对稳定状态,且维持在相对较高水平;供水较多时旱稻水分耗散量、耗水强度也较大,而相同供水条件下旱稻水分耗散量和耗水强度又小于水稻对照;相同灌溉处理旱稻产量和水分利用效率均高于水稻对照;而充足供水有利于旱稻根系在0~20cm表层发育,但不利于其根系在下层生长,而W2可促使根系下扎,更充分利用下层水分。
Relatively Simple Irrigation Scheduling and N Application Enhances the Productivity of Aerobic Rice (Oryza sativa L.)
J. Maheswari,N. Maragatham,G. James Martin
American Journal of Plant Physiology , 2007,
Abstract: A Field experiment was conducted at wetlands (Vertic Ustochrept), Agricultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore during Kharif (June to October) season of 2005, to ascertain the optimum irrigation method and nitrogen dose to enhance aerobic rice (Oryza sativa L.) productivity with PMK 3 cultivar. Four irrigation regimes viz., irrigation at IW/CPE ratio of 0.8, 1.0, 1.2 and micro sprinkler irrigation once in three days, four N levels viz., 100, 125, 150 and 175 kg ha-1 were tested in strip-plot design with three replications. Irrigation at 1.2 IW/CPE ratio recorded significantly higher crop growth rate and yield with no moisture stress, minimal proline accumulation and sterility coefficient. N levels followed the quadratic response (R2>0.973), with 150 and 175 kg N ha-1 produced on par growth and yield. Hence, irrigation at 1.2 IW/CPE ratio with 150 kg N ha-1 will be optimum to realise the maximum productivity under aerobic rice cultivation.
Page 1 /4748
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.