Dissolved Phosphorus Losses by Lateral Seepage from Swine Manure Amendments for Organic Rice Production

2013 ◽  
Vol 77 (3) ◽  
pp. 765-773 ◽  
Author(s):  
X. Q. Liang ◽  
L. Li ◽  
Y.X. Chen ◽  
H. Li ◽  
J. Liu ◽  
...  
Keyword(s):  
Swine Manure ◽  
Rice Production ◽  
Dissolved Phosphorus ◽  
Organic Rice ◽  
Manure Amendments ◽  
Phosphorus Losses

scholarly journals Mass and Energy Balances of Dry Thermophilic Anaerobic Digestion Treating Swine Manure Mixed with Rice Straw

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Sheng Zhou ◽  
Jining Zhang ◽  
Guoyan Zou ◽  
Shohei Riya ◽  
Masaaki Hosomi
Keyword(s):  
Anaerobic Digestion ◽  
Rice Straw ◽  
Swine Manure ◽  
Rice Production ◽  
Methane Yield ◽  
Manure Treatment ◽  
Thermophilic Anaerobic Digestion ◽  
Forage Rice ◽  
Energy Balances ◽  
Mass And Energy Balances

To evaluate the feasibility of swine manure treatment by a proposed Dry Thermophilic Anaerobic Digestion (DT-AD) system, we evaluated the methane yield of swine manure treated using a DT-AD method with rice straw under different C/N ratios and solid retention time (SRT) and calculated the mass and energy balances when the DT-AD system is used for swine manure treatment from a model farm with 1000 pigs and the digested residue is used for forage rice production. A traditional swine manure treatment Oxidation Ditch system was used as the study control. The results suggest that methane yield using the proposed DT-AD system increased with a higher C/N ratio and shorter SRT. Correspondently, for the DT-AD system running with SRT of 80 days, the net energy yields for all treatments were negative, due to low biogas production and high heat loss of digestion tank. However, the biogas yield increased when the SRT was shortened to 40 days, and the generated energy was greater than consumed energy when C/N ratio was 20:1 and 30:1. The results suggest that with the correct optimization of C/N ratio and SRT, the proposed DT-AD system, followed by using digestate for forage rice production, can attain energy self-sufficiency.

scholarly journals Measuring the Technical Efficiency of Certified Organic Rice Producing Farms in Yasothon Province: Northeast Thailand

2019 ◽  
Vol 11 (24) ◽  
pp. 6974
Author(s):  
Nalun Panpluem ◽  
Adnan Mustafa ◽  
Xianlei Huang ◽  
Shu Wang ◽  
Changbin Yin
Keyword(s):  
Technical Efficiency ◽  
Management Practices ◽  
Returns To Scale ◽  
Water Source ◽  
Rice Production ◽  
Farm Size ◽  
Significance Level ◽  
Organic Rice ◽  
Certified Organic ◽  
Constant Returns To Scale

Rice production holds a significant position in the Thai economy. Although it is the world’s largest rice exporter, Thailand’s increase in rice production is the result of an expansion in the cultivation area rather than an increase in yield per unit area. The present study was designed to estimate the technical efficiency and its governing factors for certified organic rice-growing farms in Yasothon Province, Thailand. A data envelopment model was employed to assess the technical efficiency of 328 farmer groups. The data revealed that the average technical efficiency was 23% and 28% under constant returns to scale (CRS) and variable returns to scale (VRS) specifications, respectively. Farmers can reduce the use of machinery, fertilizer, seed, and labor as input factors by about 80.1%, 25.62%, 24.72%, and 19.15%, respectively, while still achieving the same level of output. Multiple regression analysis was applied to estimate factors that affect the pure technical efficiency score (PTES) in the test regions. Results show that household size, farm size, water source, market accessibility, health symptoms, income, and labor were highly related to the TES and the amount of organic rice production. The regression coefficients of the predictors show that the income was the best predictor of the PTES at a significance level of p < 0.05. It is concluded that the farmers can potentially increase their yields by up to 72%–77% under current management practices.

Nitrogen Availability from Poultry Litter and Pelletized Organic Amendments for Organic Rice Production

2011 ◽  
Vol 103 (4) ◽  
pp. 1284-1291 ◽  
Author(s):  
Paula L. Wild ◽  
Chris van Kessel ◽  
Jessica Lundberg ◽  
Bruce A. Linquist
Keyword(s):  
Nitrogen Availability ◽  
Poultry Litter ◽  
Organic Amendments ◽  
Rice Production ◽  
Organic Rice

scholarly journals Economics Of Organic Rice Production

2013 ◽  
Vol 12 ◽  
pp. 97-103 ◽  
Author(s):  
Raj K Adhikari
Keyword(s):  
Poultry Manure ◽  
Labor Cost ◽  
Rice Production ◽  
P Value ◽  
Organic Rice ◽  
Technology Generation ◽  
Development Interventions ◽  
Human Labor ◽  
Agriculture And Environment ◽  
Significant Factors

Interest on organic agriculture is growing gradually in Nepal and the development interventions are concentrated more on technology generation and extension. But analysis on its economic aspect is lacking far behind. In order to know the economic performance of organic farming in general and that of organic rice production in particular, a survey research was carried out in Chitwan in 2010. From the study, the average productivity of organic rice production was found 3.15 Mt/ha which is consistent higher than national average. Among the factor cost, labor cost was found to contribute highest in total cost of production while poultry manure cost, human labor cost and oil cake cast were found to be significant factors at (P value < 0.05) to contribute in total revenue. The B:C ratio of organic rice production was found to be 1.15. The Journal of Agriculture and Environment Vol:12, Jun.2011, Page 97-103 DOI: http://dx.doi.org/10.3126/aej.v12i0.7569

scholarly journals Linking Soil Phosphorus to Dissolved Phosphorus Losses in the Midwest

ael ◽  
2017 ◽  
Vol 2 (1) ◽  
pp. 170004 ◽  
Author(s):  
Emily W. Duncan ◽  
Kevin W. King ◽  
Mark R. Williams ◽  
Greg LaBarge ◽  
Lindsay A. Pease ◽  
...  
Keyword(s):  
Soil Phosphorus ◽  
Dissolved Phosphorus ◽  
Phosphorus Losses

Management Systems for Learning on Organic Rice Production of Local Wisdom Learning Center, Surin Province

2011 ◽  
Vol 11 (1) ◽  
pp. 1-10
Author(s):  
Sangiem Konthaisong ◽  
Dr.Suchin Simaraks ◽  
Dr.Anon Pontanee ◽  
Dr.Viriya Limpinuntana ◽  
Dr.Buapun Promphakping
Keyword(s):  
Rice Production ◽  
Management Systems ◽  
Learning Center ◽  
Organic Rice

scholarly journals Soil fertility management for organic rice production in the Lao PDR

2006 ◽  
Vol 21 (4) ◽  
pp. 253-260 ◽  
Author(s):  
W. Roder ◽  
S. Schürmann ◽  
P. Chittanavanh ◽  
K. Sipaseuth ◽  
M. Fernandez
Keyword(s):  
Soil Fertility ◽  
Green Manure ◽  
Crop Residues ◽  
Production Systems ◽  
Upland Rice ◽  
Lao Pdr ◽  
Rice Production ◽  
Inorganic Fertilizer ◽  
Fertility Management ◽  
Organic Rice

AbstractRice is the most important agricultural commodity of the Lao People's Democratic Republic (Lao PDR), produced largely using traditional methods with limited inputs of fertilizers and other chemicals. The country has a wide diversity in rice production systems and rice varieties, with over 3000 different varieties recorded. The rich diversity and the production environment and methods are favorable for organic rice production. Investigations were carried out to describe soil fertility conditions, management practices, opportunities and problems associated with organic production methods for rice. Soils used for rice production are mostly of low fertility, with low organic matter and N-availability. In spite of this, virtually no fertilizer inputs are used for upland rice production. Inorganic fertilizer inputs for lowland rice production have increased rapidly over the past decade, but are still below 20 kg ha−1. The most important nutrient sources are rice straw and manure from buffalo and cattle. Chromolaena odorata plays an important role in nutrient cycling in upland rice systems and is sometimes added to lowland fields. In a range of fertility management studies, yield increase ranged from 2 to 89% for manure, straw or rice husk applied at modest rates (3 t ha−1), 32–156% for modest rates of inorganic fertilizer (60 kg N ha−1) and 36–167% for combined application of manure or crop residues with inorganic fertilizer. The response to locally produced commercial organic fertilizer was poor. The most promising inputs and strategies available to optimize yields in organic rice production systems are (1) optimizing use of locally available nutrients, mostly from manure, crop residues and weed biomass, (2) N addition through green manure and legumes growing in rotation and (3) additions of P through guano or rock-phosphate. The Lao PDR is fortunate to have substantial bat guano deposits in limestone caves. Extensive experience is available on straw and husk management for lowland systems and green manure species for upland production systems.

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