scholarly journals Establishment of Rice Seedlings by Direct Sowing of Multiple Seed Pellets on Paddy Soil Covered with Legume Living Mulch

2008 ◽  
Vol 11 (3) ◽  
pp. 361-365 ◽  
Author(s):  
Naomi Asagi ◽  
Hideto Ueno ◽  
Hiroyuki Sekiya ◽  
Hitoshi Ogiwara
Keyword(s):  
Paddy Soil ◽  
Rice Seedlings ◽  
Living Mulch ◽  
Direct Sowing

scholarly journals ​Development and Performance Evaluation of a Two-row Mechanical Paddy Transplanter

2021 ◽  
Author(s):  
Sapunii Sebastian ◽  
E.V. Thomas
Keyword(s):  
Field Capacity ◽  
Machine Construction ◽  
Asian Countries ◽  
Rice Seedlings ◽  
Huge Amount ◽  
Hilly Region ◽  
Actual Field ◽  
And Performance ◽  
Four Bar Linkage ◽  
Direct Sowing

Background: Paddy is one of the most important staple food in most south-east Asian countries. It is grown either by direct sowing or by transplanting under wetland conditions depending upon the availability of water. India produces 116.48 million tonnes of rice with a productivity of 2659 kg ha-1. Manual transplanting of rice seedlings by hand is generally done in stooping posture which is laborious and drudgery. It also requires a huge amount of labour during peak season. Considering the need and to suit the hilly region, a two-row manually operated paddy transplanter was developed. Methods: For picking the seedlings, a four-bar mechanism was selected as the basis of design. The machine construction consists of a float, seedling tray, fixed-fork type finger, chain sprocket system and lugged wheel. For operation, the operator has to rotate the crank handle which transmits the motion through the chain sprocket system and four-bar linkage which in turn picks the seedlings and plants them onto the soil. Result: The machine was tested in the actual field condition and was working satisfactorily. The designed fixed fork-type finger can hold 5 to 8 seedlings at a time. The developed machine was found to be comfortable working at a speed of 0.5 kmph. The actual field capacity of the machine was 0.02 ha/h.

scholarly journals Ethanol extract of Nandina domestica Thunb. leafs: effect on Pomacea canaliculata and growth of Orzya sativa seedlings

2018 ◽  
Vol 39 (5) ◽  
pp. 1887
Author(s):  
Hu Ye ◽  
Liu Xuan ◽  
Ye Meng ◽  
Nong Xiang ◽  
Yang Yaojun ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Normal Growth ◽  
Ethanol Extract ◽  
Dry Weight ◽  
Soil Condition ◽  
Pomacea Canaliculata ◽  
Rice Seedlings ◽  
Forest Residues ◽  
Toxicological Studies ◽  
Pot Culture

Alien species may adversely affect not only human health, agriculture, and fisheries but also the native ecosystem. Pomacea canaliculata is one of alien harmful species (IUCN). Forest residues are a kind of renewable, cheap and secure source of primary energy. Nandina domestica Thunb. is a commonly and widely cultivated plant for city landscape construction in China. After being pruned, a large of N. domestica leaves are usually abandoned. In this work, extracts of ethanol Soxhlet (SE), ethanol immerse (EE), and water immerse (WE) were obtained from leaves of N. domestica Thunb. cv. Firepower. The molluscicidal effects of the three extracts from the leaves were evaluated against black P. canaliculata. In sand pot culture condition and pot culture with paddy soil condition, SE at concentration of 4000 mg L-1 did not affect seedlings normal growth. Plant height, seedling fresh weight (SFW), seedling dry weight (SDW) and Chlorophyll content of SE (4000 mg L-1) were not significantly different from that in DS (distilled water + seedlings). Besides, in pot culture with paddy soil condition, the SE treatment at concentration of 4000 mg L-1 inhibited P. canaliculata chewing rice seedlings effectively, which was not statistically different from the positive control {NSP, niclosamide (according to field dosage, 0.086 g m-2 ) + seedlings + P. canaliculata)}. Results from this study indicated that SE has molluscicidal effect against P. canaliculata and SE did not affect the normal growth of rice seedlings. Thus, we suggest further chemical and toxicological studies of SE.

The effect of iron plaque on uptake and translocation of norfloxacin in rice seedlings grown in paddy soil

2017 ◽  
Vol 24 (8) ◽  
pp. 7544-7554 ◽  
Author(s):  
Dafang Yan ◽  
Wei Ma ◽  
Xiaojing Song ◽  
Yanyu Bao
Keyword(s):  
Paddy Soil ◽  
Iron Plaque ◽  
Rice Seedlings
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