scholarly journals Mitigating N2O and NO Emissions from Direct-Seeded Rice with Nitrification Inhibitor and Urea Deep Placement

Rice Science ◽  
2020 ◽  
Vol 27 (5) ◽  
pp. 434-444
Author(s):  
Yam Kanta Gaihre ◽  
Upendra Singh ◽  
Wendie D. Bible ◽  
Job Fugice ◽  
Joaquin Sanabria
Keyword(s):  
Nitrification Inhibitor ◽  
Deep Placement ◽  
Direct Seeded ◽  
Urea Deep Placement ◽  
No Emissions

Integration of urea deep placement and organic addition for improving yield and soil properties and decreasing N loss in paddy field

2017 ◽  
Vol 247 ◽  
pp. 236-245 ◽  
Author(s):  
Min Zhang ◽  
Yuanlin Yao ◽  
Miao Zhao ◽  
Bowen Zhang ◽  
Yuhua Tian ◽  
...  
Keyword(s):  
Soil Properties ◽  
Paddy Field ◽  
N Loss ◽  
Deep Placement ◽  
Urea Deep Placement

Benefits of mechanized deep placement of nitrogen fertilizer in direct-seeded rice in South China

2017 ◽  
Vol 203 ◽  
pp. 139-149 ◽  
Author(s):  
Shenggang Pan ◽  
Xiangcheng Wen ◽  
Zaiman Wang ◽  
Umair Ashraf ◽  
Hua Tian ◽  
...  
Keyword(s):  
South China ◽  
Nitrogen Fertilizer ◽  
Deep Placement ◽  
Direct Seeded

scholarly journals METHANE EMISSION FROM DIRECT SEEDED RICE UNDER THE INFLUENCES OF RICE STRAW AND NITRIFICATION INHIBITOR

2013 ◽  
Vol 13 (1) ◽  
pp. 1
Author(s):  
A. Wihardjaka ◽  
S. Djalal Tandjung ◽  
B. Hendro Sunarminto ◽  
Eko Sugiharto
Keyword(s):  
Rice Straw ◽  
Methane Emission ◽  
Plant Biomass ◽  
Nitrification Inhibitor ◽  
Methane Flux ◽  
Nitrification Inhibitors ◽  
Organic C ◽  
Neem Cake ◽  
Rainfed Lowland ◽  
Direct Seeded

<p>Incorporation of rice straw into soil is a common practice to improve soil productivity and increase inorganic fertilizer availability. However, this practice could contribute to methane (CH4) emission; one of the greenhouse gases that causes global warming. Nitrification inhibitors such as neem cake and carbofuran may reduce methane emission following application of rice straw. The study aimed to evaluate the application of rice straw and nitrification inhibitor to methane emission in rainfed lowland rice system. A factorial randomized block design was used with three replications. The first factor was rice straw incorporation (5 t ha-1 fresh straw, 5 t ha-1 composted straw), and the second factor was nitrification inhibitor application (20 kg ha-1 neem cake, 20 kg ha-1 carbofuran). The experiment was conducted at rainfed lowland in Pati, Central Java, during 2009/2010 wet season. Ciherang variety was planted as direct seeded rice with spacing of 20 cm x 20 cm in each plot of 4 m x 5 m. The rice straw was treated together with soil tillage, whereas nitrification inhibitor was applied together with urea application. Parameters observed were methane flux, plant height, plant biomass, grain yield, organic C content, and bacterial population in soil. The methane flux and soil organic C were measured at 25, 45, 60, 75, and 95 days after emergence. The results showed that composted rice straw incorporation significantly emitted methane lower (73.2 ± 6.6 kg CH4 ha-1 season-1) compared to the fresh rice straw (93.5 ± 4.0 CH4 ha-1 season-1). Application of nitrification inhibitors neem cake and carbofuran reduced methane emission as much as 20.7 and 15.4 kg CH4 ha-1 season-1, respectively. Under direct seeded rice system, methane flux level correlated with plant biomass as shown by linear regression of Y = 0.0015 X + 0.0575 (R2 = 0.2305, n = 27). This means that higher plant biomass produced more methane flux. The study indicates that application of nitrification inhibitors such as neem cake is prospective in decreasing methane emission from direct seeded rice cropping.</p><p> </p><br />

scholarly journals Microcontroller based granular urea application attachment for rice transplanter

2019 ◽  
Vol 17 (3) ◽  
pp. 380-387
Author(s):  
Md Towfiqur Rahman ◽  
Md Monjurul Alam ◽  
Md Mosharraf Hossain ◽  
Muhammad Rashed Al Mamun
Keyword(s):  
Control Structure ◽  
Fertilizer Application ◽  
Physical Structure ◽  
Variable Rate ◽  
Electronic Control ◽  
Power Requirement ◽  
Deep Placement ◽  
Loop Control ◽  
Urea Deep Placement ◽  
The Cost

Transplanting and fertilizer application for rice production in Bangladesh are tedious, time consuming and laborious task, and mostly done manually. Mechanical transplanting of rice becoming popular in the country in recent years and few machines have been developed for granular urea deep placement, however, having some limitations. Placing granular urea precisely along with rice transplanting, an attempt was under taken to design and fabricate an electronic control granular urea applicator to be attach with a 4-row walk behind type rice transplanter. Fabrication of the electronic granular urea applicator was done in the workshop of the Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh. Physical structure of the attachment was assembled with available parts of BARI granular urea applicator. A DC gear motor was coupled with metering disk shaft to rotate and pick granular urea from hopper. Moreover, its speed was synchronized with the picker speed of the rice transplanter by a microcontroller Arduino Mega 2560. A computer program was developed and compiled successfully into Arduino IDE, where an equation was derived and incorporated into loop control structure. The program can also be used for any kind of applications where variable rate is required. The machine was found successful in test run and laboratory-based experiments. Average spacing of granular urea placement was found 34.71 cm with 1.38% missing hill, Its power requirement was found about 20 W. This innovation provided options for performing granular urea application and rice transplanting, two most laborious tasks simultaneously which might minimize the cost of production as well as human drudgery with an error free manner. J Bangladesh Agril Univ 17(3): 380–387, 2019

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