scholarly journals Submergence Tolerance in Irrigated and Rainfed Lowland Rice Varieties: Agro-Morphological Basis for Rice Genetic Improvement in Southern Benin

OALib ◽  
2018 ◽  
Vol 05 (04) ◽  
pp. 1-15
Author(s):  
Magloire Oteyami ◽  
Espérance Codjia ◽  
Clement Agbangla ◽  
Leonard Ahoton ◽  
Carline Santos ◽  
...  
Keyword(s):  
Genetic Improvement ◽  
Lowland Rice ◽  
Submergence Tolerance ◽  
Rice Varieties ◽  
Morphological Basis ◽  
Rainfed Lowland ◽  
Rice Genetic ◽  
Southern Benin

Submergence tolerance of rainfed lowland rice: search for physiological marker traits

2001 ◽  
Vol 158 (7) ◽  
pp. 883-889 ◽  
Author(s):  
Hari P. Singh ◽  
Brij B. Singh ◽  
Phool C. Ram
Keyword(s):  
Lowland Rice ◽  
Submergence Tolerance ◽  
Rainfed Lowland

ENVIRONMENTAL CHARACTERIZATION OF FLOODWATER IN EASTERN INDIA: RELEVANCE TO SUBMERGENCE TOLERANCE OF LOWLAND RICE

1999 ◽  
Vol 35 (2) ◽  
pp. 141-152 ◽  
Author(s):  
P. C. RAM ◽  
A. K. SINGH ◽  
B. B. SINGH ◽  
V. K. SINGH ◽  
H. P. SINGH ◽  
...  
Keyword(s):  
Rice Fields ◽  
Lowland Rice ◽  
Submergence Tolerance ◽  
Eastern India ◽  
Deepwater Rice ◽  
Field Surveys ◽  
Saturated Water ◽  
Rainfed Lowland ◽  
Water Profile

Floodwater was characterized through field surveys over three years in rainfed lowland and deepwater rice areas of Eastern India. Measurements focused on dissolved O2 and CO2, pH and irradiance during flash floods in rice fields. Over locations and time, dissolved O2 concentrations ranged from zero to 0.28 mol m−3 (0–1.1 times air-saturated water at 30 °C) while dissolved CO2 ranged from 0.28 to 1.96 mol m−3 (31–217 times air-saturated water). Floodwater pH varied from 6.6 to 9.7. Irradiance decreased with depth in the water profile to an extent depending on turbidity. Turbidity varied greatly over locations and time. The significance of these measurements in assessing rice submergence tolerance is discussed.

THE RAINFED LOWLAND RICE RESEARCH CONSORTIUM: A MULTI-INSTITUTIONAL APPROACH FOR SUSTAINABLE PRODUCTIVITY INCREASES IN ASIAN RICE-BASED SYSTEMS

1999 ◽  
Vol 35 (2) ◽  
pp. 115-125 ◽  
Author(s):  
R. S. ZEIGLER
Keyword(s):  
Nutrient Management ◽  
Agricultural Research ◽  
Lowland Rice ◽  
Yield Potential ◽  
Multidisciplinary Teams ◽  
Nutrient Deficiencies ◽  
Rice Varieties ◽  
Asian Rice ◽  
Rainfed Lowland ◽  
Research Consortium

Input-responsive, high yielding rice varieties and associated technologies responsible for the doubling of yields on irrigated lands in Asia have not suited the area of more than 40 million hectares of Asian rainfed lowland rice. These environments are home to some of the poorest rural populations in South and Southeast Asia, and the rice crops are subject to drought, prolonged submergence from uncontrolled flooding and nutrient deficiencies. Farmers grow unimproved varieties and these, combined with abiotic stresses and low inputs, result in grain yields often less than 2 t ha−1. The International Rice Research Institute (IRRI) and National Agricultural Research Systems (NARS) have recently joined to form the Rainfed Lowland Rice Research Consortium in order to identify, prioritize and execute strategic research that addresses critical yield and productivity constraints. Principal intervention points for achieving sustainable yield increases are in developing drought- and submergence-tolerant germplasm with good yield potential, improved nutrient management under stress conditions, water use-efficient crop establishment practices, and understanding farmers' approaches to risk management. Multidisciplinary teams of IRRI and NARS scientists execute research at sites selected across the region to represent the key sets of constraints.

On-Farm Evaluation of Rainfed Lowland Rice Varieties at Olokose Village, Odeda, Ogun State, Nigeria

2008 ◽  
Vol 7 (2) ◽  
pp. 192-196 ◽  
Author(s):  
A.A. Oyekanmi ◽  
K.A. Okeleye ◽  
C.J. Okonji
Keyword(s):  
Lowland Rice ◽  
Rice Varieties ◽  
Ogun State ◽  
Rainfed Lowland ◽  
On Farm

scholarly journals Recovering Ability of Upland and Rainfed Lowland Rice Varieties against Rice Tungro Disease

2018 ◽  
Vol 21 (1) ◽  
pp. 91-100 ◽  
Author(s):  
MT Khatun ◽  
MA Latif ◽  
MM Rahman ◽  
M Hossain ◽  
TH Ansari ◽  
...  
Keyword(s):  
Upland Rice ◽  
Lowland Rice ◽  
Resistant Variety ◽  
Yield Reduction ◽  
Insect Vector ◽  
Rice Varieties ◽  
Rice Tungro Disease ◽  
Rainfed Lowland ◽  
Endemic Areas ◽  
Almost All

Rice tungro is the most destructive and widespread among virus diseases found in almost all rice growing areas. In susceptible varieties, it causes 100% yield loss under favourable environmental conditions. Control of tungro disease by chemical applications is not effective and eco-friendly. Development of resistant variety against tungro is also difficult, because it is necessary to develop resistance either to the insect vector or to the virus or to the both. Identification of varieties with recovering ability will facilitate farmers to cultivate rice in tungro endemic areas. Bangladesh Rice Research Institute released six upland and eight rainfed lowland rice varieties, which were tested to evaluate their recovering ability against tungro disease. The test varieties including susceptible and resistant checks were artificially inoculated by viruliferous vector (Green leafhopper, Nephotettix virescens) of ten days after seeding in net house condition. Among the tested varieties BR26, BRRI dhan33 and BRRI dhan40 were the most susceptible and showed high infection rate against tungro disease. BRRI dhan37 and BR8 showed the highest recovering ability in rainfed lowland and upland rice, respectively, with the lowest yield reduction compared to the resistant check Kumragoir, which could be used in tungro endemic areas. From these investigations, all the tested varieties expressed distinct tungro disease symptoms after three weeks of inoculation. With the advancement of plant growth, varieties BR8 and BRRI dhan37 recovered from tungro syndrome due to their genetic makeup consisting tolerance potentiality showed better yield, while other varieties like BRRI dhan33 and BRRI dhan40 did not produce any grain yieldBangladesh Rice j. 2017, 21(1): 91-100

scholarly journals Response of rain-fed lowland rice varieties to different sources of N fertilizer in Fogera Plain, Northwest Ethiopia

2019 ◽  
Vol 5 (1) ◽  
pp. 1707020
Author(s):  
Amare Aleminew ◽  
Getachew Alemayehu ◽  
Enyew Adgo ◽  
Tilahun Tadesse ◽  
Manuel Tejada Moral
Keyword(s):  
Northwest Ethiopia ◽  
N Fertilizer ◽  
Lowland Rice ◽  
Rice Varieties ◽  
Different Sources
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