scholarly journals INFLUENCE OF LONG_TERM RICE_DUCK FARMING SYSTEMS ON THE COMPOSITION AND DIVERSITY OF WEED COMMUNITIES IN PADDY FIELDS

2006 ◽  
Vol 30 (1) ◽  
pp. 9-16 ◽  
Author(s):  
WEI Shou-Hui ◽  
◽  
QIANG Sheng ◽  
MA Bo ◽  
WEI Ji-Guang ◽  
...  
Keyword(s):  
Farming Systems ◽  
Paddy Fields ◽  
Weed Communities

scholarly journals Effect of introducing frogs and fish on soil phosphorus availability dynamics and their relationship with rice yield in paddy fields

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Kaimiao Lin ◽  
Jianping Wu
Keyword(s):  
Best Practice ◽  
Rice Yield ◽  
Soil Phosphorus ◽  
Farming Systems ◽  
Paddy Fields ◽  
Rice Grain ◽  
P Availability ◽  
Soil P ◽  
Labile P ◽  
Rice Fish

AbstractThe long-term impacts of introducing frogs and fish on rice yield and soil P availability are largely underestimated and undervalued. A 9-year field experiment compared the soil phosphorus fraction dynamics and their relationship with rice yield in rice-frog-fish (RFF) cultures, rice-fish (RF) cultures and rice-only (RO) cultures in southeastern China paddy fields. The yields in the RFF and RF cultures were notably higher than those in the RO culture, by 22.1% and 6.8%, respectively. Soil total P ranged from 345.5 to 385.6 mg kg−1 among all the farming systems, with the smallest amount found in the RO culture. There were only slight changes in the distribution of soil phosphorus fractions with time. The concentrations of NaHCO3-Pi and NaHCO3-Po were significantly higher in the RFF and RF cultures compared with those in the RO culture, and most of the NaOH-Pi and NaOH-Po fractions were greater in the RFF and RF cultures compared with those in the RO culture. The rice grain yield was significantly correlated with labile P and slowly cycling P. Introducing frogs and fish might be useful for increasing soil active P supplies and meeting rice nutrient requirements. This study concluded that RFF is the best practice for improving rice grain yields and soil fertility in paddy fields.

Weed communities and distribution characteristics in the paddy fields ofmain rice growing regions of Hubei Province

2009 ◽  
Vol 17 (3) ◽  
pp. 533-536 ◽  
Author(s):  
Xiang-Qian CHANG ◽  
Ru-Hai LI ◽  
Shi-Hai CHU ◽  
Wen-Da ZHU ◽  
Qi-Zhi CHEN
Keyword(s):  
Hubei Province ◽  
Paddy Fields ◽  
Distribution Characteristics ◽  
Weed Communities

Restoration of weed communities in abandoned rice paddy fields in the Tama Hills, central Japan

2007 ◽  
Vol 119 (1-2) ◽  
pp. 88-102 ◽  
Author(s):  
Susumu Yamada ◽  
Satoru Okubo ◽  
Yoshiko Kitagawa ◽  
Kazuhiko Takeuchi
Keyword(s):  
Rice Paddy ◽  
Paddy Fields ◽  
Central Japan ◽  
Weed Communities ◽  
Rice Paddy Fields

scholarly journals Effects of Integrated Rice-Frog Farming on Paddy Field Greenhouse Gas Emissions

2019 ◽  
Vol 16 (11) ◽  
pp. 1930 ◽  
Author(s):  
Kaikai Fang ◽  
Xiaomei Yi ◽  
Wei Dai ◽  
Hui Gao ◽  
Linkui Cao
Keyword(s):  
Grain Yield ◽  
Greenhouse Gas ◽  
Ghg Emissions ◽  
Farming Systems ◽  
Rice Fields ◽  
Paddy Fields ◽  
N2o Emissions ◽  
Soil Redox Potential ◽  
Ch4 Emissions ◽  
Significant Difference

Integrated rice-frog farming (IRFF), as a mode of ecological farming, is fundamental in realizing sustainable development in agriculture. Yet its production of greenhouse gas (GHG) emissions remains unclear. Here, a randomized plot field experiment was performed to study the GHG emissions for various farming systems during the rice growing season. The farming systems included: conventional farming (CF), green integrated rice-frog farming (GIRF), and organic integrated rice-frog farming (OIRF). Results indicate that the cumulative methane (CH4) emissions from the whole growth period were divergent for the three farming systems, with OIRF having the highest value and CF having the lowest. For nitrous oxide (N2O) emissions, the order is reversed. IRFF significantly increased the dissolved oxygen (DO), soil redox potential (Eh), total organic carbon (TOC) content, and soil C:N ratio, which is closely related to GHG emissions in rice fields. Additionally, the average emissions of carbon dioxide (CO2) from soils during rice growing seasons ranged from 2312.27 to 2589.62 kg ha−1 and showed no significant difference in the three treatments. Rice yield in the GIRF and OIRF were lower (2.0% and 16.7%) than the control. The CH4 emissions contributed to 83.0–96.8% of global warming potential (GWP). Compared to CF, the treatment of GIRF and OIRF increased the GWP by 41.3% and 98.2% during the whole growing period of rice, respectively. IRFF significantly increased greenhouse gas intensity (GHGI, 0.79 kg CO2-eq ha−1 grain yield), by 91.1% over the control. Compared to the OIRF, GIRF decreased the GHGI by approximately 39.4% (0.59 kg CO2-eq ha−1 grain yield), which was 44.2% higher than that of the control. The results of structural equation model showed that the contribution of fertilization to CH4 emissions in paddy fields was much greater than that of frog activity. Moreover, frog activity could decrease GWP by reducing CH4 emissions from rice fields. And while GIRF showed a slight increase in GHG emissions, it could still be considered as a good strategy for providing an environmentally-friendly option in maintaining crop yield in paddy fields.

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