scholarly journals Lowland ecotype Cyperus rotundus L. affects growth and yield of rice under flooded conditions in the Philippines

2021 ◽  
Author(s):  
Dindo King M. Donayre ◽  
Jessica Joyce L. Jimenez ◽  
Anna Maria Lourdes S. Latonio ◽  
Edwin C. Martin ◽  
Bhagirath S. Chauhan
Keyword(s):  
Control Strategy ◽  
Root Biomass ◽  
The Philippines ◽  
Height Growth ◽  
Cyperus Rotundus ◽  
Growth And Yield ◽  
Transplanted Rice ◽  
Direct Seeded ◽  
Experimental Runs ◽  
Shoot And Root Biomass

AbstractLowland ecotype Cyperus rotundus L. has been reported infesting irrigated lowland ricefields in the Philippines. Its effects on growth and yield of rice under flooded conditions are unknown. Two experimental runs were conducted in a screenhouse to determine the growth of lowland ecotype C. rotundus with transplanted rice and wet direct-seeded rice at a sowing density of 0, 22, 44, 66, and 88 tubers m-2; and its effect on growth and yield of rice. Except for height, growth variables of lowland ecotype C. rotundus were increased with the increase in its initial tuber densities. Compared with 22 tubers m-2, its number of off-shoots and tubers, and shoot and root biomass at 44 to 88 tubers m-2 increased by up to 3x. Growth variables of rice were reduced by the weed. Grain yield of transplanted rice was reduced by 14 to 38%; wet direct-seeded rice by 11 to 28%. Results suggest that lowland ecotype C. rotundus can grow well and reduce growth and yield of rice under flooded conditions. It also imply the need of developing a holistic weed control strategy against the weed.

Nitrogen Fertilization of Direct‐Seeded Flooded vs. Transplanted Rice: I. Nitrogen Uptake, Photosynthesis, Growth, and Yield

Crop Science ◽  
1990 ◽  
Vol 30 (6) ◽  
pp. 1276-1284 ◽  
Author(s):  
H. F. Schnier ◽  
M. Dingkuhn ◽  
S. K. De Datta ◽  
K. Mengel ◽  
J. E. Faronilo
Keyword(s):  
Nitrogen Uptake ◽  
Nitrogen Fertilization ◽  
Growth And Yield ◽  
Transplanted Rice ◽  
Direct Seeded

Impact of weedy rice populations on the growth and yield of direct-seeded and transplanted rice

2007 ◽  
Vol 7 (2) ◽  
pp. 97-104 ◽  
Author(s):  
QIAN JIN CAO ◽  
BO LI ◽  
ZHI PING SONG ◽  
XING XING CAI ◽  
BAO-RONG LU
Keyword(s):  
Growth And Yield ◽  
Weedy Rice ◽  
Transplanted Rice ◽  
Direct Seeded

Suitability of elite genotypes for wet-direct seeding in rice-rice system in Vertisol

2020 ◽  
Vol 57 (1) ◽  
pp. 36-42
Author(s):  
Soumya Saha ◽  
Mangal Deep Tuti ◽  
R Mahender Kumar ◽  
Bandeppa ◽  
T Vidhan Singh
Keyword(s):  
Total Duration ◽  
Direct Seeding ◽  
Growth And Yield ◽  
Rabi Season ◽  
Growth Duration ◽  
Rice Varieties ◽  
Growing Seasons ◽  
Transplanted Rice ◽  
Significant Difference ◽  
Direct Seeded

This study was conducted to evaluate few elite rice genotypes in wet-direct seeded system vis-à-vis conventional transplanting in clayey vertisol of Telangana during two consecutive seasons (rabi and kharif) of 2015-16. The experiment was laid out in split-plot design with two methods of crop establishment in main plots viz. conventional transplanting (CT) and direct seeded rice (DSR) in puddled condition with nine rice varieties of different growth duration in sub-plots and replicated thrice. Growth and yield attributing characters were not differed in both the establishment techniques. Grain yields during the rabi season was higher by about 1.5 % under DSR, whereas, during kharif it was about 1 % higher in transplanted rice. Total duration of cultivars was decreased in DSR to the tune of 14 days during two seasons. There was no significant difference in mean grain yield across rice cultivars in two consecutive growing seasons between direct seeding and conventional transplanting. During rabi season DRR Dhan 44, Rasi, DRRH-2, HRI-174, RNR 15048, RP Bio-226 performed well; whereas Rasi, DRR Dhan 44, DRRH-2 and Varadhan found suitable in kharif.

Growth Response of Direct-Seeded Rice to Oxadiazon and Bispyribac-Sodium in Aerobic and Saturated Soils

Weed Science ◽  
2011 ◽  
Vol 59 (1) ◽  
pp. 119-122 ◽  
Author(s):  
Bhagirath S. Chauhan ◽  
David E. Johnson
Keyword(s):  
Root Biomass ◽  
Crop Production ◽  
Growth Response ◽  
Aerobic Condition ◽  
Shoot Biomass ◽  
Growth Responses ◽  
Rice Varieties ◽  
Direct Seeded ◽  
Aerobic Soil ◽  
Shoot And Root Biomass

Studies were conducted to determine the growth responses of rice to PRE application of oxadiazon and POST application of bispyribac-sodium. Oxadiazon at 1.0 and 1.5 kg ha−1and bispyribac-sodium at 0.030 and 0.045 kg ha−1were applied to four rice varieties (‘IR64’, ‘IR72’, ‘RC09’, and ‘RC18’), which were grown in saturated and aerobic (30% of saturation) soils. Control treatments, where no herbicides were applied, were also included in the study. Shoot and root biomass, and height of rice plants were measured 14 d after application. Phytotoxic effects for both herbicides, including reduced shoot and root biomass, were consistent in all varieties. Rice phytotoxicity symptoms were greater when herbicides were applied to saturated than to aerobic soils. Oxadiazon at 1.0 kg ha−1reduced rice shoot biomass by 22 to 36% in aerobic condition, and 43 to 56% in saturated condition when compared with the control. Bispyribac-sodium reduced rice shoot biomass by 9 to 17% at 0.030 kg ha−1in aerobic soil and 23 to 37% in saturated soil. The results of this study suggest that soil water content is an important factor influencing herbicide phytotoxicity in rice, and its influence warrants further research to improve understanding of physiology of phytotoxicity to minimize the effects of these herbicides on crop production.

scholarly journals Comparison of Direct Seeded and Transplanted Rice in Response to Zinc under Salt-Affected Soil

2017 ◽  
Vol 60 (2) ◽  
pp. 112-114
Author(s):  
Muhammad Arshad Ullah ◽  
Imdad Ali Mahmood ◽  
Badar-uz- Zaman ◽  
Syed Ishtiaq Haider ◽  
Muhammad Suhaib ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Plant Height ◽  
Soil Salinity ◽  
Growth And Yield ◽  
Panicle Length ◽  
Salt Affected Soil ◽  
Transplanted Rice ◽  
Direct Seeded ◽  
Different Levels ◽  
Paddy Yield

An experiment was carried out to investigate the effect of different levels of Zn (0, 5, 10, 15kg/ha) on growth and yield of direct seeded and transplanted rice (Oryza sativa) under naturally salt-affected soil having pH=8.32; ECe=6.41dS/m; SAR=26.71(mmolc/L)½ at the farm of Soil Salinity ResearchInstitute, Pindi Bhattian during 2013. Plant height, number of tillers/plant, panicle length and number ofgrains/panicle were higher in transplanted rice than direct seeded rice at all Zn levels. Maximum paddyyield (2.61 t/ha) of direct seeded rice was attained with the application of 10 kg Zn/ha closely followedby 15 kg Zn/ha application (2.41 t/ha) which was statistical at par with paddy yield (2.45 t/ha) of transplantedrice in salt-affected field. However, overall paddy yield of direct seeded rice was 5 % higher than thetransplanted rice.

Phenotypic Plasticity of Blistering Ammannia (Ammannia baccifera) in Competition with Direct-Seeded Rice

2013 ◽  
Vol 27 (2) ◽  
pp. 373-377 ◽  
Author(s):  
Bhagirath Singh Chauhan
Keyword(s):  
Weed Management ◽  
Root Biomass ◽  
Stem Length ◽  
Integrated Weed Management ◽  
Leaf Biomass ◽  
Weed Growth ◽  
Weak Competitor ◽  
Direct Seeded ◽  
Screen House ◽  
Shoot And Root Biomass

Crop interference and weed-competitive cultivars are a component of integrated weed management, but their use requires understanding the extent to which rice can interfere with weed growth and how weeds may respond to rice interference. Growth of blistering ammannia was studied in a screen house by growing it alone or with rice seeded in rows (20 cm) or broadcast at the rate of 25 and 75 kg ha−1. The growth of blistering ammannia was similar whether grown with rice seeding rates of 25 or 75 kg ha−1or with broadcast or row-seeded rice, suggesting that the weed is a weak competitor if rice is planted uniformly. Rice interference greatly reduced the number of blistering ammannia leaves and leaf, stem, total shoot, and root biomass. However, the weed showed the ability to reduce the effects of rice interference by increasing leaf and stem biomass in the upper half of the plant, and increasing specific stem length. At 11 wk after planting, blistering ammannia had 71 to 80% leaf biomass in the upper half of the plant when grown with rice interference compared with only 29% when grown without rice interference. Despite such plasticity, blistering ammannia shoot and root biomass at final harvest decreased by 94 to 99% when grown with rice compared with its biomass without crop interference. These results suggest that blistering ammannia is a poor competitor and uniform rice density could be very effective in suppressing blistering ammannia in direct-seeded rice systems.

scholarly journals Growth Responses of Boreal Scots Pine, Norway Spruce and Silver Birch Seedlings to Simulated Climate Warming over Three Growing Seasons in a Controlled Field Experiment

Forests ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 943
Author(s):  
Katri Nissinen ◽  
Virpi Virjamo ◽  
Antti Kilpeläinen ◽  
Veli-Pekka Ikonen ◽  
Laura Pikkarainen ◽  
...  
Keyword(s):  
Norway Spruce ◽  
Scots Pine ◽  
Root Biomass ◽  
Growing Season ◽  
Silver Birch ◽  
Shoot Biomass ◽  
Growth Responses ◽  
Growing Seasons ◽  
Simulated Climate ◽  
Shoot And Root Biomass

We studied the growth responses of boreal Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies L. Karst.) and silver birch (Betula pendula Roth) seedlings to simulated climate warming of an average of 1.3 °C over the growing season in a controlled field experiment in central Finland. We had six replicate plots for elevated and ambient temperature for each tree species. The warming treatment lasted for the conifers for three growing seasons and for the birch two growing seasons. We measured the height and diameter growth of all the seedlings weekly during the growing season. The shoot and root biomass and their ratios were measured annually in one-third of seedlings harvested from each plot in autumn. After two growing seasons, the height, diameter and shoot biomass were 45%, 19% and 41% larger in silver birch seedlings under the warming treatment, but the root biomass was clearly less affected. After three growing seasons, the height, diameter, shoot and root biomass were under a warming treatment 39, 47, 189 and 113% greater in Scots pine, but the root:shoot ratio 29% lower, respectively. The corresponding responses of Norway spruce to warming were clearly smaller (e.g., shoot biomass 46% higher under a warming treatment). As a comparison, the relative response of height growth in silver birch was after two growing seasons equal to that measured in Scots pine after three growing seasons. Based on our findings, especially silver birch seedlings, but also Scots pine seedlings benefitted from warming, which should be taken into account in forest regeneration in the future.

scholarly journals Seed Priming with Potassium Nitrate and Gibberellic Acid Enhances the Performance of Dry Direct Seeded Rice (Oryza sativa L.) in North-Western India

Agronomy ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 849
Author(s):  
Buta Singh Dhillon ◽  
Virender Kumar ◽  
Pardeep Sagwal ◽  
Navjyot Kaur ◽  
Gurjit Singh Mangat ◽  
...  
Keyword(s):  
Gibberellic Acid ◽  
Grain Yield ◽  
Oryza Sativa L ◽  
Seed Priming ◽  
Potassium Nitrate ◽  
Growth And Yield ◽  
Western India ◽  
Yield Attributes ◽  
Crop Establishment ◽  
Direct Seeded

Poor early growth and uneven crop establishment are reported as the major bottlenecks in wide-scale adoption and optimal yield realization of dry direct-seeded rice (DSR). Seed priming can potentially help overcome these problems in DSR. Therefore, laboratory and field studies were conducted at Punjab Agricultural University, Ludhiana, India, during kharif/wet-season 2018 and 2019 to evaluate the effect of different priming techniques on germination, establishment, growth, and grain yield of rice under DSR conditions. The following priming treatments were evaluated: dry non-primed seed (control), hydropriming with distilled water, halopriming with 2.0% potassium nitrate, hormopriming with 50 ppm gibberellic acid (GA3), and osmopriming with polyethylene glycol (PEG)(−0.6 MPa), each with 12 and 24 h priming duration. In 2019, priming treatments were tested under two DSR establishment methods—conventional DSR (sowing in dry soil followed by irrigation) and soil mulch DSR (locally known as vattar DSR) (sowing in moist soil after pre-sowing irrigation), whereas in 2018, priming treatments were evaluated under conventional DSR only. In both years, halopriming and hormopriming resulted in a 7–11% increase in rice yields compared to non-primed dry seed (control). Osmopriming resulted in a 4% yield increase compared to control in 2018 but not in 2019. The higher yields in halopriming and hormopriming were attributed to higher and rapid germination/crop emergence, better root growth, and improvement in yield attributes. Priming effect on crop emergence, growth, and yield did not differ by DSR establishment methods and duration of priming. Conventional DSR and soil mulch DSR did not differ in grain yield, whereas they differed in crop emergence, growth, and yield attributes. These results suggest that halopriming with 2.0% potassium nitrate and hormopriming with 50 ppm GA3 has good potential to improve crop establishment and yield of rice in both conventional and soil mulch DSR systems.

scholarly journals Reproductive, pathogenic and genotypic characterisation of five Meloidogyne graminicola populations from the Philippines on susceptible and resistant rice varieties

Nematology ◽  
2018 ◽  
Vol 20 (4) ◽  
pp. 299-318
Author(s):  
Ma. Teodora Nadong Cabasan ◽  
Arvind Kumar ◽  
Stéphane Bellafiore ◽  
Dirk De Waele
Keyword(s):  
Phenotypic Variability ◽  
The Philippines ◽  
Growth And Yield ◽  
Oryza Glaberrima ◽  
Rice Varieties ◽  
Single Nucleotide ◽  
Nematode Reproduction ◽  
Rdna Genes ◽  
Meloidogyne Graminicola ◽  
Disease Induction

Summary Five populations of Meloidogyne graminicola isolated from different rice-growing areas in the Philippines were characterised. The populations showed little phenotypic variability of second-stage juveniles and female perineal pattern. Differences in reproduction among M. graminicola populations were not observed on mature resistant Oryza glaberrima varieties ‘TOG5674’, ‘TOG5675’, ‘RAM131’ and ‘CG14’, or on susceptible O. sativa varieties ‘IR64’ and ‘UPLRi-5’. In all infected rice varieties, plant growth and yield-contributing traits showed no differences among the populations. A search on M. graminicola populations from the Philippines for single-nucleotide polymorphism on the sequences of Internal Transcribed Spacer (ITS) of rDNA genes and mtDNA indicated only few points of heteroplasmy. Nematode reproduction and disease induction of the five M. graminicola populations in the Philippines exerted the same level of aggressiveness and virulence. The absence of resistance-breaking populations of M. graminicola is important for the maintenance of durability of resistance to this important rice pathogen.

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