Ammonia volatilization from a paddy field following applications of urea: Rice plants are both an absorber and an emitter for atmospheric ammonia

2008 ◽  
Vol 390 (2-3) ◽  
pp. 485-494 ◽  
Author(s):  
Kentaro Hayashi ◽  
Seiichi Nishimura ◽  
Kazuyuki Yagi
Keyword(s):  
Paddy Field ◽  
Ammonia Volatilization ◽  
Atmospheric Ammonia ◽  
Rice Plants

Effect of topsoil removal and selective countermeasures on radiocesium accumulation in rice plants in Fukushima paddy field

2017 ◽  
Vol 603-604 ◽  
pp. 49-56 ◽  
Author(s):  
Baolu Yang ◽  
Yuichi Onda ◽  
Yoshihiro Ohmori ◽  
Hitoshi Sekimoto ◽  
Toru Fujiwara ◽  
...  
Keyword(s):  
Paddy Field ◽  
Rice Plants ◽  
Topsoil Removal

scholarly journals Survival and Subsequent Dispersal of Rice Sclerotial Disease Fungi, Rhizoctonia oryzae and Rhizoctonia oryzae-sativae, in Paddy Fields

Plant Disease ◽  
2006 ◽  
Vol 90 (5) ◽  
pp. 615-622 ◽  
Author(s):  
Qingyuan Guo ◽  
Akiko Kamio ◽  
Bhim Sen Sharma ◽  
Yukiko Sagara ◽  
Masao Arakawa ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Paddy Field ◽  
Maturation Stage ◽  
Disease Development ◽  
Field Isolates ◽  
Rice Plants ◽  
Growing Seasons ◽  
Rhizoctonia Oryzae ◽  
Mycelial Compatibility ◽  
Field Area

In 1998 to 2001, a commercial rice (Oryza sativa) paddy field (area: ca. 0.14 ha) was surveyed for Rhizoctonia oryzae and R. oryzae-sativae, causal agents of bordered sheath spot and brown sclerotium disease of rice plants, respectively, to determine their survival in soil and stubble during the pretransplanting season, and the effect on disease development during the maturation season of rice. Then, infection by these fungi of weeds belonging to 17 families, which grew in the four neighboring fields, was examined during rice growing seasons. All field isolates of the fungi from soil, stubble, rice sclerotial disease lesions (diseased tissues), and weeds were assorted into mycelial compatibility groups (MCGs) based on the barrage zone reaction of paired isolates. In R. oryzae, 3 to 8 MCGs were annually found from soil/stubble, 2 to 4 MCGs from rice bordered sheath spot lesions, and 4 to 9 MCGs from 4 to 14 weeds. MCGs common to both soil/stubble and diseased tissues, soil/stubble and weeds, and diseased tissues and weeds numbered 1 to 2 in all cases. In R. oryzae-sativae, MCGs common to both soil/stubble and brown sclerotium disease lesions, and soil/stubble and weeds, numbered 1 to 4 and 0 to 5, respectively. In R. oryzae and R. oryzae-sativae, a few MCGs were common to soil/stubble, diseased tissues and weeds, and some were also common to diseased tissues in 1998 and soil/stubble in 1999, or weed in 1998 and diseased tissues in 1999. Members belonging to a single MCG from rice diseased tissues were detected from maximally five weeds growing in the neighboring fields. These results indicate that fungi that had caused sclerotial diseases at the maturation stage of rice plants survived on and in soil and stubble until the pretransplanting season of the next year, followed by wide dispersal in and out of fields and by infection and disease development on rice plants and various weeds.

Effect of wheat straw application on ammonia volatilization from urea applied to a paddy field

2012 ◽  
Vol 94 (1) ◽  
pp. 73-84 ◽  
Author(s):  
Jun Wang ◽  
Dejian Wang ◽  
Gang Zhang ◽  
Can Wang
Keyword(s):  
Wheat Straw ◽  
Paddy Field ◽  
Ammonia Volatilization ◽  
Straw Application

scholarly journals Pengembangan Prototipe Dan Pengujian Traktor Satu Roda Untuk Pemeliharaan Tanaman Padi

2020 ◽  
Vol 7 (2) ◽  
pp. 147-154
Author(s):  
Jusran Jusran ◽  
Radite Praeko Agus Setiawan ◽  
I Dewa Made Subrata
Keyword(s):  
Paddy Field ◽  
Performance Test ◽  
Paddy Fields ◽  
Rice Plants

Most of paddy fields in Indonesia are not consolidated, therefore, soil hardpan usually did not exist.  With no soil hardpan, mobility of any machine for crop maintenance is very difficult even in some places is almost impossible.Until now crop maintenance such as weeding, spraying and spreading fertilizer was done manually by labor. Then mechanization is required to replace the labour which is not available or very expensive. Hence, this study conducted with objective to make a prototype II of a single wheel tractor  for crop maintenance operated in deep mud field or in an unconsolidated paddy field. The study also did performance test of a single wheel tractor to measure the tractor speed, traction, sinkage, and slip of wheel  when operated in rice plants field. The results of performance test showed that the speed average of wheel with straight lug and curved lug were 1.15km/hour and 0.97 km/hour. The average of sinkage and slip both of wheels with straight lug and curved lug respectively were 24.8 cm, 25.9 cm and 38.7 %, 26.12%. The results of performance test olso showed that the traction average of wheel with straight lug and curved lug respectively were 45.8 kg and 41.5 kg

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