Estimation of fertilizer nitrogen requirement for average rice yield in Japanese paddy fields

2002 ◽  
Vol 48 (3) ◽  
pp. 293-300 ◽  
Author(s):  
Kazunobu Toriyama
Keyword(s):  
Rice Yield ◽  
Paddy Fields ◽  
Fertilizer Nitrogen ◽  
Nitrogen Requirement

scholarly journals Effects of Biochar Amendment on CO2 Emissions from Paddy Fields under Water-Saving Irrigation

2018 ◽  
Vol 15 (11) ◽  
pp. 2580 ◽  
Author(s):  
Shihong Yang ◽  
Zewei Jiang ◽  
Xiao Sun ◽  
Jie Ding ◽  
Junzeng Xu
Keyword(s):  
Co2 Emissions ◽  
Rice Yield ◽  
Rice Paddy ◽  
C Sequestration ◽  
Sensitivity Coefficient ◽  
Water Saving ◽  
Paddy Fields ◽  
Flood Irrigation ◽  
Controlled Irrigation ◽  
Biochar Amendment

The role of carbon pool of biochar as a method of long-term C sequestration in global warming mitigation is unclear. A two-year field study was conducted to investigate the seasonal variations of CO2 emissions from water-saving irrigation paddy fields in response to biochar amendment and irrigation patterns. Three biochar treatments under water-saving irrigation and one biochar treatment under flooding irrigation were studied, and the application rates were 0, 20, 40, and 40 t ha−1 and labeled as CI + NB (controlled irrigation and none biochar added), CI + MB (controlled irrigation and medium biochar added), CI + HB (controlled irrigation and high biochar added), and FI + HB (flood irrigation and high biochar added), respectively. Results showed that biochar application at medium rates (20 t ha−1) decreased CO2 emissions by 1.64–8.83% in rice paddy fields under water-saving irrigation, compared with the non-amendment treatment. However, the CO2 emissions from paddy fields increased by 4.39–5.43% in the CI + HB treatment, compared with CI + NB. Furthermore, the mean CO2 emissions from paddy fields under water-saving irrigation decreased by 2.22% compared with flood irrigation under the same amount of biochar application (40 t ha−1). Biochar amendment increased rice yield and water use efficiency by 9.35–36.30% and 15.1–42.5%, respectively, when combined with water-saving irrigation. The CO2 emissions were reduced in the CI + MB treatment, which then increased rice yield. The CO2 emissions from paddy fields were positively correlated with temperature. The highest value of the temperature sensitivity coefficient (Q10) was derived for the CI + MB treatment. The Q10 was higher under water-saving irrigation compared with flooding irrigation.

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.

scholarly journals Rice Yield and the Fate of Fertilizer Nitrogen as Affected by Addition of Earthworm Casts Collected from Oilseed Rape Fields: A Pot Experiment

PLoS ONE ◽  
2016 ◽  
Vol 11 (11) ◽  
pp. e0167152 ◽  
Author(s):  
Min Huang ◽  
Xuefeng Zhou ◽  
Xiaobing Xie ◽  
Chunrong Zhao ◽  
Jiana Chen ◽  
...  
Keyword(s):  
Oilseed Rape ◽  
Rice Yield ◽  
Pot Experiment ◽  
Earthworm Casts ◽  
Fertilizer Nitrogen

Characteristics of the acidity and sulphate fractions in acid sulphate soils and their relationship with rice yield

2016 ◽  
Vol 154 (8) ◽  
pp. 1463-1473 ◽  
Author(s):  
Q. HUANG ◽  
S. TANG ◽  
X. HUANG ◽  
S. YANG ◽  
Q. YI
Keyword(s):  
Soil Quality ◽  
Soil Acidity ◽  
Rice Yield ◽  
Paddy Fields ◽  
Strongly Correlated ◽  
Acid Sulphate ◽  
Exchangeable Acidity ◽  
Acid Sulphate Soils ◽  
Plough Layer ◽  
Soluble Sulphate

SUMMARYMost acid sulphate soils (ASSs) in the Pearl River Delta of South China have been traditionally reclaimed for rice cultivation, but the rice yield in most of these paddy fields is lower than the average rice yield in China due to extremely high soil acidity. In the present study, a range of sulphate and acidity parameters were investigated in ASS profiles in three types of paddy fields in Taishan City (Guangdong Province, China) divided based on the local rice productivity (4500, 3000 and 1500 kg/ha) using an abandoned ASS (uncultivated) as the control treatment to ascertain key yield constraining parameters. Soluble acidity (SA), exchangeable acidity (ExA), soluble sulphate (SS) and net acid-soluble sulphate (NAS) increased with increasing soil depths from 0 to 100 cm and then decreased abruptly with further increases in the depth. However, the depth distribution of exchangeable sulphate (ES) was uniform. The soil acidity and sulphate contents differed significantly in three sampled paddy fields. The values of SA and SS in the soils at depths of 0–100 cm in the studied ASS were lower compared with those in the uncultivated ASS and the ExA in soils at depths of 0–40 cm in ASS were lower compared with those observed in the uncultivated ASS. A correlation analysis revealed that SA was strongly correlated with SS and ExA with NAS. Soluble acidity, ExA, SS and NAS in the ASS were significantly associated with rice yield. Exchangeable acidity in the plough layer (0–20 cm) of soils was the most sensitive indicator of soil quality affecting rice yield among those in soils from 0 to 140 cm depth. It is interesting to note that SA, SS and NAS were more sensitive indicators of soil quality affecting rice yield at 60–100 cm than at 0–40 cm depth. Principal component analysis showed that pH value, ExA and ES in soils at depths of 0–40 cm and SA, SS and NAS in soils at depths of 60–100 cm constituted the critical soil acidity and sulphate characteristics that were strongly correlated with rice yields. This finding implies that controlling the ExA in the plough layer and the SA and NAS in the Jarosite layer should be the major focus of studies aimed at the amelioration of ASSs.

scholarly journals Deep rooting conferred by DEEPER ROOTING 1 enhances rice yield in paddy fields

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Yumiko Arai-Sanoh ◽  
Toshiyuki Takai ◽  
Satoshi Yoshinaga ◽  
Hiroshi Nakano ◽  
Mikiko Kojima ◽  
...  
Keyword(s):  
Rice Yield ◽  
Paddy Fields

Integrated rice management simultaneously improves rice yield and nitrogen use efficiency in various paddy fields

Pedosphere ◽  
2020 ◽  
Vol 30 (6) ◽  
pp. 863-873 ◽  
Author(s):  
Yujiao DONG ◽  
Fanwen ZENG ◽  
Jiang YUAN ◽  
Guangbin ZHANG ◽  
Yuanxue CHEN ◽  
...  
Keyword(s):  
Nitrogen Use Efficiency ◽  
Rice Yield ◽  
Paddy Fields ◽  
Nitrogen Use ◽  
Use Efficiency

Rice yield losses by competition with weeds in rainfed paddy fields in north-east Thailand

2003 ◽  
Vol 3 (3) ◽  
pp. 162-171 ◽  
Author(s):  
SHINSUKE TOMITA ◽  
SHUICHI MIYAGAWA ◽  
YASUYUKI KONO ◽  
CHAIRAT NOICHANA ◽  
TATSUYA INAMURA ◽  
...  
Keyword(s):  
Rice Yield ◽  
Paddy Fields ◽  
Yield Losses ◽  
North East

Sorghum-Legume Intercropping and the Effects of Nitrogen Fertilization. II. Residual Effect on Wheat

1984 ◽  
Vol 20 (3) ◽  
pp. 261-265 ◽  
Author(s):  
A. B. Waghmaref ◽  
S. P. Singh
Keyword(s):  
Nitrogen Fertilization ◽  
Wheat Yield ◽  
Residual Effect ◽  
Fertilizer Nitrogen ◽  
Nitrogen Requirement ◽  
Previous Season ◽  
Different Levels

SUMMARYWheat yield was increased significantly when grown after sorghum intercropped with cowpeas (both for fodder and grain) or with groundnut compared with sole sorghum in the previous season. The nitrogen requirement for the target wheat yield of 4.0 t ha−1 was 108 kg ha−1 after sole sorghum and this was reduced by 87, 61, 83 and 38 kg ha−1 after intercrops of sorghum with fodder and grain cowpeas, groundnut and greengram, respectively. The different levels of nitrogen applied to the sorghum-legume intercropping systems also allowed savings of between 18 and 55 kg ha−1 of fertilizer nitrogen on wheat in the following season.

Sign in / Sign up

Export Citation Format

Share Document