scholarly journals Evaluating the Performance of Rice Genotypes for Improving Yield and Adaptability Under Direct Seeded Aerobic Cultivation Conditions

2019 ◽  
Vol 10 ◽  
Author(s):  
Nitika Sandhu ◽  
Ram Baran Yadaw ◽  
Bedanand Chaudhary ◽  
Hari Prasai ◽  
Khandakar Iftekharuddaula ◽  
...  
Keyword(s):  
Cultivation Conditions ◽  
Aerobic Cultivation ◽  
Direct Seeded ◽  
Rice Genotypes

Growth and Iron Uptake of Lowland and Aerobic Rice Genotypes under Flooded and Aerobic Cultivation

2012 ◽  
Vol 43 (13) ◽  
pp. 1811-1822 ◽  
Author(s):  
Xiaoyun Fan ◽  
Md. Rezaul Karim ◽  
Xinping Chen ◽  
Yueqiang Zhang ◽  
Xiaopeng Gao ◽  
...  
Keyword(s):  
Iron Uptake ◽  
Aerobic Rice ◽  
Aerobic Cultivation ◽  
Rice Genotypes

scholarly journals Response of Rice Genotypes to Weed Competition in Dry Direct-Seeded Rice in India

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Gulshan Mahajan ◽  
Mugalodi S. Ramesha ◽  
Bhagirath S. Chauhan
Keyword(s):  
Grain Yield ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Root Biomass ◽  
Early Stage ◽  
Weed Competition ◽  
Genotypic Differences ◽  
Area Index ◽  
Direct Seeded ◽  
Rice Genotypes

The differential weed-competitive abilities of eight rice genotypes and the traits that may confer such attributes were investigated under partial weedy and weed-free conditions in naturally occurring weed flora in dry direct-seeded rice during the rainy seasons of 2011 and 2012 at Ludhiana, Punjab, India. The results showed genotypic differences in competitiveness against weeds. In weed-free plots, grain yield varied from 6.6 to 8.9 t ha−1across different genotypes; it was lowest for PR-115 and highest for the hybrid H-97158. In partial weedy plots, grain yield and weed biomass at flowering varied from 3.6 to 6.7 t ha−1and from 174 to 419 g m−2, respectively. In partial weedy plots, grain yield was lowest for PR-115 and highest for PR-120. Average yield loss due to weed competition ranged from 21 to 46% in different rice genotypes. The study showed that early canopy closure, high leaf area index at early stage, and high root biomass and volume correlated positively with competitiveness. This study suggests that some traits (root biomass, leaf area index, and shoot biomass at the early stage) could play an important role in conferring weed competitiveness and these traits can be explored for dry-seeded rice.

Yield and nitrogen use efficiency of selected dry-direct seeded rice genotypes in North-West India

2018 ◽  
Vol 55 (4) ◽  
pp. 639
Author(s):  
Rupinder Kaur ◽  
Sandeep Sharma ◽  
Seema Bedi ◽  
Gulshan Mahajan
Keyword(s):  
Nitrogen Use Efficiency ◽  
Nitrogen Use ◽  
North West ◽  
Direct Seeded ◽  
Use Efficiency ◽  
Rice Genotypes

scholarly journals Yield and Yield Attributing Characters of Promising Rice Genotypes under Dry Direct Seeded Conditions as Affected by Varieties and Weed Control Methods

2018 ◽  
Vol 6 (4) ◽  
pp. 313-318
Author(s):  
Dev Kumar Saphi ◽  
Dil Raj Yadav ◽  
Rajib Kumar Yadav ◽  
Rajendra Yadav
Keyword(s):  
Weed Control ◽  
Field Experiments ◽  
Control Methods ◽  
Rice Varieties ◽  
Human Labour ◽  
Main Plot ◽  
Direct Seeded ◽  
Rice Genotypes ◽  
Hand Weeding ◽  
Plot Design

Dry direct seeded rice is an alternative to the farmers in the context of climate change and inputs scarcity especially labor. However, weeds are the major problem in dry direct seeded conditions competing with the different resources provided to the crop. Hence, field experiments were conducted for two consecutive years 2015 and 2016 in the experimental field of Rice Research Program, Hardinath, Dhanusha to identify the appropriate herbicides for DSR. The experiment was laid out in a split plot design and treatments were replicated thrice. Three varieties of rice namely Ciherang Sub-1, IET 16775 and Sukhkhadhan-3 were treated as main plot factors while five levels of weed control methods (Oxadiargyl @ 100 g a.i./ha as pre-emergence followed by Fenoxaprop @ 90 g a.i./ha with safener, Pendimethalin @ 1000 g a.i./ha as pre-emergence followed by Bispyribac sodium @ 25 g a.i/ha at three weeks after seeding, Pendimethalin @ 1000 g a.i./ha as pre-emergence followed by Pyrazosulfuron ethyl @ 25 g a.i.ha + Bispyribac sodium @ 25 g a.i./ha at three weeks after seeding, hand weeding and weedy check) were treated as sub-plot factors. The statistical analysis showed that the effect of weed control methods on yield and yield attributing parameters of the tested rice varieties was significant. Out of the tested treatments hand weeding yielded significantly higher grain yield (5.4 t/ha) followed by herbicides Pendimithalin fb Pyrazosulfuron ethyl + Bispyribac sodium; which reduced the weed density and was comparable with hand weeding. The interaction effect of weed control methods and varieties was found non-significant. Pendimithalin fb Pyrazosulfuron ethyl + Bispyribac sodium was found to control broad spectrum of weeds and also reduced the human labour drudgery and increasing the rice yield than the other herbicides in direct seeded rice. Int. J. Appl. Sci. Biotechnol. Vol 6(4): 313-318

scholarly journals Genetic Divergence Studies for Anaerobic Germination Traits in Rice (Oryza sativa L.)

2020 ◽  
pp. 71-78
Author(s):  
K. Sudeepthi ◽  
T. Srinivas ◽  
B. N. V. S. R. Ravi Kumar ◽  
D. P. B. Jyothula ◽  
Sk. Nafeez Umar
Keyword(s):  
Genetic Divergence ◽  
Oryza Sativa L ◽  
Dry Weight ◽  
Rice Varieties ◽  
Mean Values ◽  
Analysis Technique ◽  
Cluster Distance ◽  
Direct Seeded ◽  
Rice Genotypes ◽  
Germination Traits

The present investigation was carried out to study the inherent genetic diversity of 107 rice genotypes towards development of rice varieties with tolerance for germination under anaerobic conditions for use in wet direct seeded rice cultivation system. The diversity was evaluated using multivariate analysis technique of Mahalanobis D2. The 107 rice genotypes studied were grouped into nine clusters. Twenty nine genotypes were grouped in cluster II followed by 27, 22, 10, 11 and 5 genotypes each in clusters I, III, IV, VI and cluster VII, respectively. The pattern of distribution of genotypes into various clusters was observed to be at random with no relation to geographical diversity. Results on inter-cluster distances revealed maximum diversity between genotypes of cluster VII and cluster IX, while intra-cluster distance was noticed to be maximum for cluster VI. Cluster IX had recorded higher cluster mean values for all the traits studied. Further, the traits, namely, shoot length, seedling dry weight and anaerobic response index together accounted for 62.45 per cent of the total genetic divergence in this study.

Sign in / Sign up

Export Citation Format

Share Document