scholarly journals Competition for Nutrient Uptake during Winter Season among Cultivated Nori Layer and Phytoplanktons Causing Red Tide in Ariake Bay

2005 ◽  
Vol 28 (5) ◽  
pp. 339-345 ◽  
Author(s):  
Masataka NAKASHIMA ◽  
Yoshihiro YOKOYAMA ◽  
Tadashi UCHIDA ◽  
Takuji NAKANO ◽  
Hiroshi NAKANISHI
Keyword(s):  
Nutrient Uptake ◽  
Red Tide ◽  
Winter Season ◽  
Ariake Bay

scholarly journals Evaluation of Various Environmental Factors on the Nutrient Uptake Competition between Nori Laver and Planktonic Diatoms in Ariake Bay, Japan

2005 ◽  
Vol 14 (3) ◽  
pp. 411-427 ◽  
Author(s):  
Osamu Kawaguchi ◽  
Tamiji Yamamoto ◽  
Osamu Matsuda ◽  
Toshiya Hashimoto
Keyword(s):  
Environmental Factors ◽  
Nutrient Uptake ◽  
Ariake Bay ◽  
Planktonic Diatoms

scholarly journals Improved MODIS-Aqua Chlorophyll-a Retrievals in the Turbid Semi-Enclosed Ariake Bay, Japan

2018 ◽  
Vol 10 (9) ◽  
pp. 1335 ◽  
Author(s):  
Meng Meng Yang ◽  
Joji Ishizaka ◽  
Joaquim I. Goes ◽  
Helga do R. Gomes ◽  
Elígio de Raús Maúre ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Red Tide ◽  
Atmospheric Correction ◽  
Ariake Bay ◽  
Band Ratio ◽  
Simple Method ◽  
Chl A ◽  
Switching Algorithm ◽  
Economic Significance

The accurate retrieval of chlorophyll-a concentration (Chl-a) from ocean color satellite data is extremely challenging in turbid, optically complex coastal waters. Ariake Bay in Japan is a turbid semi-enclosed bay of great socio-economic significance, but it suffers from serious water quality problems, particularly due to red tide events. Chl-a derived from the MODerate resolution Imaging Spectroradiometer (MODIS) sensor on satellite Aqua in Ariake Bay was investigated, and it was determined that the causes of the errors were from inaccurate atmospheric correction and inappropriate in-water algorithms. To improve the accuracy of MODIS remote sensing reflectance (Rrs) in the blue and green bands, a simple method was adopted using in situ Rrs data. This method assumes that the error in MODIS Rrs(547) is small, and MODIS Rrs(412) can be estimated from MODIS Rrs(547) using a linear relation between in situ Rrs(412) and Rrs(547). We also showed that the standard MODIS Chl-a algorithm, OC3M, underestimated Chl-a, which was mostly due to water column turbidity. A new empirical switching algorithm was generated based on the relationship between in situ Chl-a and the blue-to-green band ratio, max(Rrs(443), Rrs(448)/Rrs(547), which was the same as the OC3M algorithm. The criterion of Rrs(667) of 0.005 sr−1 was used to evaluate the extent of turbidity for the switching algorithm. The results showed that the switching algorithm performed better than OC3M, and the root mean square error (RMSE) of estimated Chl-a decreased from 0.414 to 0.326. The RMSE for MODIS Chl-a using the recalculated Rrs and the switching algorithm was 0.287, which was a significant improvement from the RMSE of 0.610, which was obtained using standard MODIS Chl-a. Finally, the accuracy of our method was tested with an independent dataset collected by the local Fisheries Research Institute, and the results revealed that the switching algorithm with the recalculated Rrs reduced the RMSE of MODIS Chl-a from 0.412 of the standard to 0.335.

scholarly journals Effect of Sources, Levels and Methods of Potash Fertilization on Yield, Nutrient Uptake, Soil Chemical Properties and Quality of Rabi Onion in an Inceptisol

Agropedology ◽  
2019 ◽  
Vol 28 (1) ◽  
Author(s):  
D.D. Sawale ◽  
◽  
B.D. Tamboli ◽  
Vedshree Patil ◽  
A.B. Jadhav ◽  
...  
Keyword(s):  
Nutrient Uptake ◽  
Winter Season ◽  
Foliar Spray ◽  
Chemical Properties ◽  
Additional Treatment ◽  
College Of Agriculture ◽  
Available N ◽  
Bulb Formation ◽  
Mn Content

A field experiment on rabi onion (cv. N-2-4-1) was carried out at an experimental farm of College of Agriculture, Pune during the winter season of 2016-17, to study the effect of different levels and sources of potash (0, 50, 100 and 150 kg K2O ha-1) and methods of its application as a basal (30% K2O at the time of transplanting, 40 per cent through fertigation after 30 days of transplanting till initiation of bulb formation and remaining 30 per cent through fertigation after 60 days of transplanting till bulb formation at weekly intervals respectively). In addition to that one more additional treatment of 100 kg K2O ha-1 was applied in the proportion of 90 kg K2O through MOP as a basal application + 10 kg K2O through SOP as a foliar spray @ 1% after 60 and 75 days after transplanting for comparing methods of K application. The results revealed that, the application of 100 kg K2O ha-1 (90 kg K2O ha-1 as basal at the time of transplanting through MOP and 10 kg K2O through two foliar sprays of SOP at 60 and 75 days after transplanting) recorded maximum fresh bulb weight, dry matter yield, and higher bulb diameter, the higher nutrient uptake of nitrogen, phosphorus, potassium, sulphur, Fe, Mn, Zn and Cu uptake by rabi onion. The perceptible improvement in available N,P,K , S and Mn content of soil due to application of 150 kg K2O ha-1 through SOP applied through soil and fertigation over control. The application of 100 kg K2O ha-1 (SOP) through soil and fertigation or 100 kg K2O ha-1 was applied in the proportion of 90 kg K2O through MOP as a basal application + 10 kg K2O through SOP as a foliar spray @ 1% after 60 and 75 days of transplanting recorded magnitudely lower mean physiological loss in weight.

scholarly journals Study on the scarcity of red tide in the eutrophicated waters of Ariake Bay - V. Separation of dinoflagellate growth inhibitor from sea sediment.

1988 ◽  
Vol 54 (7) ◽  
pp. 1175-1181 ◽  
Author(s):  
Shinya Ishio ◽  
Takashi Nishimoto ◽  
Hisaki Nakagawa
Keyword(s):  
Red Tide ◽  
Growth Inhibitor ◽  
Ariake Bay

scholarly journals Study on the scarcity of red tide in the eutrophicated waters of Ariake Bay. II. H2S-extraction method for Fe-bound P in sea sediments.

1986 ◽  
Vol 52 (1) ◽  
pp. 103-108 ◽  
Author(s):  
Shinya Ishio ◽  
Masato Kuwahara ◽  
Hisaki Nakagawa
Keyword(s):  
Extraction Method ◽  
Red Tide ◽  
Ariake Bay

Fertilizer Potential of Sea Weed (Kappaphycus and Gracilaria) Saps in Potato Crop

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
S. K. Singh ◽  
S. S. LAL ◽  
R. K. SINGH ◽  
S. T. ZODAPE
Keyword(s):  
Nutrient Uptake ◽  
Tuber Yield ◽  
Sandy Loam ◽  
Potato Crop ◽  
Winter Season ◽  
Foliar Spray ◽  
Growth Yield ◽  
Research Station ◽  
Seaweed Extracts ◽  
Loam Soil

A field experiment was conducted during winter season of 2012-13 in sandy loam soil at Central Potato Research Station, Patna to study the effects of seaweed saps on growth, yield and nutrient uptake of Potato. The foliar spray was applied at 45, 60 and 75 days after planting at different concentrations (0, 2.5, 5.0, 7.5 and 10 % v/v) of seaweed extracts namely Kappaphycus( K Sap) and Gracilaria (G Sap). Foliar applications of seaweed sap significantly enhanced large and medium grade as well as total tuber yield. Increment in total tuber yield of potato with application of 7.5% K sap + recommended dose of fertilizer (RDF), 5% G sap + RDF, and 10% G sap + RDF) over control were in tune of 3.95 t ha-1 ,4.88 and 4.07 t ha-1 respectively. Applications of 7.5 % K sap+ RDFand 5% G sap + RDF resulted in increase by 15.8 and 34.9% in large grade tuber yield and 11.5% and 22.5% in medium grade tuber yield, respectively compared to control. Improved nutrient uptake (NPK) was also observed with seaweed extract.

scholarly journals RNA-Seq Analysis Reveals Genes Related to Photoreception, Nutrient Uptake, and Toxicity in a Noxious Red-Tide Raphidophyte Chattonella antiqua

2019 ◽  
Vol 10 ◽  
Author(s):  
Tomoyuki Shikata ◽  
Fumio Takahashi ◽  
Hiroyo Nishide ◽  
Shuji Shigenobu ◽  
Yasuhiro Kamei ◽  
...  
Keyword(s):  
Nutrient Uptake ◽  
Red Tide ◽  
Rna Seq ◽  
Chattonella Antiqua

scholarly journals Study on the scarcity of red tide in the eutrophicated waters of Ariake Bay. III. Conversion of AlPO4-P to Fe-bound P in sea sediments.

1986 ◽  
Vol 52 (5) ◽  
pp. 901-911 ◽  
Author(s):  
Shinya Ishio ◽  
Masato Kuwahara ◽  
Hisaki Nakagawa
Keyword(s):  
Red Tide ◽  
Ariake Bay
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