Evaluation of Biofertilizers in Irrigated Rice: Effects on Grain Yield at Different Fertilizer Rate

2014 ◽  
pp. 163-180 ◽  
Keyword(s):  
Grain Yield ◽  
Fertilizer Rate ◽  
Irrigated Rice

scholarly journals Globe fringerush (Fimbristylis miliacea) cross resistance to als-inhibitor herbicides under field conditions in irrigated rice in the south of Brazil

2013 ◽  
Vol 31 (4) ◽  
pp. 893-902 ◽  
Author(s):  
C.E. Schaedler ◽  
J.A. Noldin ◽  
D.S. Eberhardt ◽  
D. Agostinetto ◽  
N.R. Burgos
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Rice Fields ◽  
Field Conditions ◽  
Cross Resistance ◽  
Herbicide Application ◽  
The South ◽  
Santa Catarina ◽  
Irrigated Rice ◽  
South Of Brazil

ALS-inhibiting herbicides usually provide adequate weed control in irrigated rice fields. After consecutive years of use, the Cyperaceae species, globe fringerush (Fimbristylis miliacea) began to show resistance to ALS (acetolactate synthase) inhibitors. Globe fringerush is one of the most problematic herbicide-resistant weeds in irrigated rice in the state of Santa Catarina in the South of Brazil. The objective of this research was to examine cross resistance of globe fringerush to ALS inhibitors, under field conditions. Two experiments were conducted in a rice field naturally infested with ALS-resistant globe fringerush in Santa Catarina, in the 2008/09 and 2009/10 cropping seasons. The experimental units were arranged in randomized complete block design, with five replicates, consisting of two factors (herbicide and dose) in a 4 x 5 factorial arrangement. ALS herbicides included bispyribac-sodium, ethoxysulfuron, pyrazosulfuron-ethyl and penoxsulam. Six-leaf globe fringerush was sprayed with herbicide doses of 0, 0.5, 1, 2 and 4X the recommended doses in a spray volume of 200 L ha-1. The number of rice culm, filled and sterile grains, plant height, dry shoot biomass and grain yield were recorded. Globe fringerush control was evaluated 28 and 70 days after herbicide application (DAA); shoots were harvested at 13 weeks after herbicide application and dry weight recorded. Competition with globe fringerush reduced the number of culm and rice grain yield. The globe fringerush biotype in this field was resistant to all ALS herbicides tested. Penoxsulam had the highest level of activity among treatments at 28 and 70 DAA, but the control level was only 50% and 42%, respectively, in the second year of assessment. This was not enough to prevent rice yield loss. Alternative herbicides and weed control strategies are necessary to avoid yield losses in rice fields infested with ALS-resistant biotypes of globe fringerush.

Grain yield, water productivity and CH 4 emission of irrigated rice in response to water management in south China

2016 ◽  
Vol 163 ◽  
pp. 319-331 ◽  
Author(s):  
Kaiming Liang ◽  
Xuhua Zhong ◽  
Nongrong Huang ◽  
Rubenito M. Lampayan ◽  
Junfeng Pan ◽  
...  
Keyword(s):  
Water Management ◽  
Grain Yield ◽  
South China ◽  
Water Productivity ◽  
Irrigated Rice ◽  
Response To Water

scholarly journals Critical-point models to relate yield and disease intensity of the multiple pathosystem in rice leaf spots disease

2015 ◽  
Vol 46 (1) ◽  
pp. 7-12
Author(s):  
Luiz Carlos Bordin ◽  
Ricardo Trezi Casa ◽  
Leandro Luiz Marcuzzo ◽  
Erlei Melo Reis ◽  
André Gheller ◽  
...  
Keyword(s):  
Grain Yield ◽  
Critical Point ◽  
Damage Threshold ◽  
Brown Spot ◽  
Simultaneous Occurrence ◽  
Economic Damage ◽  
Damage Functions ◽  
Irrigated Rice ◽  
Leaf Spots ◽  
Damage Coefficient

ABSTRACT: The occurrence of leaf spots in irrigated rice can reduce the yield and compromise the quality of the grain. However it is unknown the economic damage threshold (EDT) that these spots cause the yield of crop. The objective of this study was to obtain damage functions for models of critical, to relate damage by simultaneous occurrence of blast, brown spot and scald spot with grain yield harvests in 2011/12 and 2012/2013, in Rio do Oeste, Santa Catarina State, Brazil. Gradient of diseases intensity was generated by number of applications and fungicides rates. Design was a randomized block with four replications and six treatments consisting of mixing fungicide applications of triazole (difenoconazole) and strobilurin (azoxystrobin). In 2011/12 and 2012/13 growing season were made two and three tests respectively with the same experiment. Before each application it was determined the incidence and severity of fungal diseases. The critical point models were obtained by linear regression between grain yield and incidence (I) and severity (S). In 2011/12 the functions were not significant at the beginning of tillering and 2012/2013 harvest resulted in R=13.404-92.98I and R=10.685-3.804S. Respectively in each harvest resulted in tillering (R=9.141-103.6I; R=7.605-1.538 and R=8.864-73.91I; R=7.202-77S), panicle initiation (R=9.432-188.5I; R=7.,038-1.466S and R=10.176-87.33I; R=8.258-533.55S), booting (R=7.044-71.78I; R=6.881-1.296S and R=9.993-71.74I; R=8.846-763.83S), flowering (R=7.447-82.29I; R=8.731-1.398S and R=8.347-54.36I; R=7.338-681.52S) and milky grain (R=10.143-80.5I; R=7.522-1.402S and R=8.661-60.063I; R=9.754-1.465S). The generated functions allow getting the damage coefficient for use in the calculation of EDT in multiple pathossystem leaf spots in irrigated rice.

scholarly journals Site-Specific Nutrient Management for Irrigated Rice in South Central Region of Bangladesh

2018 ◽  
Vol 20 (2) ◽  
pp. 1-9
Author(s):  
MAA Mamun ◽  
SA Islam ◽  
MS Islam ◽  
AJ Mridha ◽  
MA Saleque
Keyword(s):  
Grain Yield ◽  
Central Region ◽  
Field Trial ◽  
Nutrient Management ◽  
Rice Yield ◽  
Substantial Variation ◽  
Irrigated Rice ◽  
Site Specific ◽  
South Central ◽  
A Site

A site-specific nutrient management (SSNM) field trial was conducted for irrigated rice using five fertilizer treatments: i) omission of N, ii) omission of P, iii) omission of K, iv) NPK and v) farmers’ practice (FP). Substantial variation in the native N, P, and K supply was found among farmers’ fields. The indigenous soil K produced 4.5 to 5.0 t ha-1 but native P and N gave only rice yield of 3.5 to 4.0 t ha-1. The highest grain yield (6.0 to 7.5 t ha-1) was obtained from balanced fertilization, followed by FP (4.0 to 5.0 t ha-1).The optimal grain yield at Faridpur was obtained by using N, P and K at 135, 8 and 49 kg ha-1; 139, 9 and 42 kg ha-1; and 140, 10 and 43 kg ha-1 for high, medium and low land rice, respectively. However, for Gopalgonj district fertilizer doses of N, P and K were 140, 11 and 38 kg ha-1; 142, 10 and 42 kg ha-1; and 138, 10 and 49 kg ha-1; and for Madaripur district, 126, 8 and 46 kg ha-1; 120, 7 and 38 kg ha-1; and 99, 6 and 27 kg ha-1 for high, medium and low land rice, respectively. These predicted fertilizer doses increase farmers’ income and protect environment from pollution.Bangladesh Agron. J. 2017, 20(2): 1-9

Crop management based on multi-split topdressing enhances grain yield and nitrogen use efficiency in irrigated rice in China

2015 ◽  
Vol 184 ◽  
pp. 50-57 ◽  
Author(s):  
Yutiao Chen ◽  
Jing Peng ◽  
Jing Wang ◽  
Penghao Fu ◽  
Yu Hou ◽  
...  
Keyword(s):  
Grain Yield ◽  
Nitrogen Use Efficiency ◽  
Crop Management ◽  
Nitrogen Use ◽  
Irrigated Rice ◽  
Use Efficiency

scholarly journals Correlations and path analysis for yield components in irrigated rice

2018 ◽  
Vol 9 (2) ◽  
pp. 154-161
Author(s):  
Eduardo Anibele Streck ◽  
Gabriel Almeida Aguiar ◽  
Paulo Henrique Karling Facchinello ◽  
Lais Perin ◽  
Tuise Kuhn Krüger ◽  
...  
Keyword(s):  
Grain Yield ◽  
Path Analysis ◽  
Phenotypic Correlation ◽  
Panicle Length ◽  
Agronomic Characters ◽  
Complex Character ◽  
Irrigated Rice ◽  
Selection For ◽  
Main Components ◽  
Selection Of

Grain yield of irrigated rice is a complex character resulting from the expression and association of different components, which should be considered by the breeder for an efficient process of selection of new genotypes. In this sense, the objective is to highlight the phenotypic correlations and the direct and indirect associations of the main components related to crop yield via path analysis. The experiment was carried out in an experimental field of the Lowlands Station of Embrapa Clima Temperado using six genotypes of irrigated rice: the cultivars BRS Pampa, BRS IRGA 409, BRS 7 ‘Taim’, BRS Sinuelo CL, BRS Pampeira and AB 10101 CL. The agronomic characters evaluated were grain yield, days to flowering, panicle length, panicle mass, number of fertile spikelets, number of sterile spikelets, number of tillers per plant, number of panicles per square meter, and mass of one thousand grains. The number of fertile spikelets, number of panicles per square meter, panicle mass and mass of one thousand grains influenced grain yield, both through phenotypic correlation and direct effects. In addition, there was a high direct linear tendency of these variables towards yield. Panicle length and number of sterile spikelets showed a potential of use in the indirect selection for grain yield.

scholarly journals Soluble tissue sugar content and leaf blast severity in response to the application of calcinated serpentinite as a silicon source in irrigated rice

2007 ◽  
Vol 33 (4) ◽  
pp. 402-404 ◽  
Author(s):  
Anne Sitarama Prabhu ◽  
Alberto Baêta dos Santos ◽  
Agostinho Dirceu Didonet
Keyword(s):  
Field Experiment ◽  
Grain Yield ◽  
Sugar Content ◽  
Rice Cultivar ◽  
Leaf Blast ◽  
Irrigated Rice ◽  
Silicon Source ◽  
Sugar Levels ◽  
The Relationship ◽  
Total Tissue

A field experiment conducted with the irrigated rice cultivar BRS Formoso, to assess the efficiency of calcinated serpentinite as a silicon source on grain yield was utilized to study its effect on leaf blast severity and tissue sugar levels. The treatments consisted of five rates of calcinated serpentinite (0, 2, 4, 6, 8 Mg.ha-1) incorporated into the soil prior to planting. The leaf blast severity was reduced at the rate of 2.96% per ton of calcinated serpentinite. The total tissue sugar content decreased significantly as the rates of serpentinite applied increased (R² = 0.83). The relationship between the tissue sugar content and leaf blast severity was linear and positive (R² = 0.81). The decrease in leaf blast severity with increased rates of calcinated serpentinite was also linear (R²= 0.96) and can be ascribed to reduced sugar level.

scholarly journals Identification of an Elite Core Panel as a Key Breeding Resource to Accelerate the Rate of Genetic Improvement for Irrigated Rice

2021 ◽  
Author(s):  
Roselyne U. Juma ◽  
Jérôme Bartholomé ◽  
Parthiban Thathapalli Prakash ◽  
Waseem Hussain ◽  
John Damien Platten ◽  
...  
Keyword(s):  
Grain Yield ◽  
Genetic Gain ◽  
Genetic Improvement ◽  
Critical Role ◽  
The Philippines ◽  
Breeding Program ◽  
Breeding Cycle ◽  
Relationship Matrix ◽  
Irrigated Rice ◽  
Breeding Values

Abstract Rice genetic improvement is a key component of achieving and maintaining food security in Asia and Africa in the face of growing populations and climate change. In this effort, the International Rice Research Institute (IRRI) continues to play a critical role in creating and disseminating rice varieties with higher productivity. Due to increasing demand for rice, especially in Africa, there is a strong need to accelerate the rate of genetic improvement for grain yield.In an effort to identify and characterize the elite breeding pool of IRRI’s irrigated rice breeding program, we analyzed 102 historical yield trials conducted in the Philippines during the period 2012-2016 and representing 15,286 breeding lines (including released varieties). A mixed model approach based on the pedigree relationship matrix was used to estimate breeding values for grain yield, which ranged from 2.12 to 6.27 t·ha-1. The rate of genetic gain for grain yield was estimated at 8.75 kg·ha-1·year-1 (0.23%) for crosses made in the period from 1964 to 2014. Reducing the data to only IRRI released varieties, the rate doubled to 17.36 kg·ha-1·year-1 (0.46%). Regressed against breeding cycle the rate of gain for grain yield was 185 kg·ha-1·cycle-1 (4.95%). We selected 72 top performing lines based on breeding values for grain yield to create an elite core panel (ECP) representing the genetic diversity in the breeding program with the highest heritable yield values from which new products can be derived. The ECP closely aligns with the indica 1B sub-group of Oryza sativa that includes most modern varieties for irrigated systems. Agronomic performance of the ECP under multiple environments in Asia and Africa confirmed its high yield potential.We found that the rate of genetic gain for grain yield found in this study was limited primarily by long cycle times and the direct introduction of non-improved material into the elite pool. Consequently, the current breeding scheme for irrigated rice at IRRI is based on rapid recurrent selection among highly elite lines. In this context, the ECP constitutes an important resource for IRRI and NAREs breeders to carefully characterize and manage that elite diversity.

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