Influence of overplanting paddy rice on irrigation water delivery performance: a case study in the Dakalt branch canal,Nile Delta of Egypt     

Farig  Mohamed  Shimizu  Katsuyuki  El-Kassar  Gamal  Abou El Hassan  Waleed H.  Fujimaki  Haruyuki  Kita  Ichiro  Watanabe  Tsugihiro 《Paddy and Water Environment》2022,20(1):51-60

In the North Nile Delta of Egypt, the impacts of overplanting paddy rice on water delivery performance have not been discussed quantitatively. Further, the amount of water that could have been saved if farmers would follow the planned area is unknown. In this study, water delivery performance was assessed by comparison of actual paddy rice planting and the government’s planned conditions. For both conditions, performance indicators relating to adequacy, equity, and dependability were analyzed across six locations in conjunction with the branch canal water level in 2013 and 2014. Based on the difference between the actual water supply and planned water demand, the amount of water that could have been saved for downstream uses was calculated. The average adequacy for the investigation period was good at one location, fair at 2 locations, and poor at 3 locations in both years. Further, adequacy under both actual and planned conditions was poor in late July at all locations. The planned adequacy and dependability downstream and equity among locations improved compared to the actual condition in both years. Under the condition that paddy rice area is the upper limit planned by the government, about 12.3% and 9.6% of water could be potentially saved in each year. The difference between actual and planned water delivery performance is caused by the branch canal’s low water level. Control of overplanting paddy rice and coordination of water distribution among water user associations would improve stable water level in the canal and, eventually, water delivery performance.

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Suitable inflow rate and furrow length for simplified surge flow irrigation     

Onishi  Junya  Ikeura  Hiroshi  Paluashova  Gaukhar K.  Shirokova  Yulia I.  Kitamura  Yoshinobu  Fujimaki  Haruyuki 《Paddy and Water Environment》2019,17(2):185-193

Paddy and Water Environment - In the arid lands covering Uzbekistan, furrow irrigation with low application efficiency is still widely used due to a lack of funds and shortage of labor. To save...  相似文献   

Improvement in recruitment of Japanese sardine with delays of the spring phytoplankton bloom in the Sea of Japan          下载免费PDF全文

Taketoshi Kodama  Taku Wagawa  Seiji Ohshimo  Haruyuki Morimoto  Naoki Iguchi  Ken‐Ichi Fukudome  Tsuneo Goto  Motomitsu Takahashi  Tohya Yasuda 《Fisheries Oceanography》2018,27(4):289-301

To evaluate the impact of temporal variation of primary productivity on the recruitment of Japanese sardine (Sardinops melanostictus) in the Sea of Japan, the phenology of sea surface phytoplankton abundance was estimated from 8 day multiple satellite (SeaWiFS, MODIS‐Aqua, MERIS, and VIIRS) derived sea surface chlorophyll (SSChl) a concentrations from January 1998 to December 2015. Because relationships between SSChl a and in situ chlorophyll a concentrations were significantly different among periods based on the satellite combinations used, maximum and minimum SSChl a concentrations of 1 year were relativized as 1 and 0, respectively. Spatio‐temporal variation of relativized SSChl a concentrations was determined by using empirical orthogonal function (EOF) analysis. Scores in the first EOF mode denoted the basin‐scale variations of SSChl a concentrations in the Sea of Japan, and the major peak from the end of February to the end of May displayed the spring bloom. The logarithm of recruitment per spawner (LNRPS) for sardine was positively affected by delays in the start and end dates of the spring phytoplankton bloom. The delay of the date of the lowest sea surface temperature contributed to the delay of the end of the spring bloom during the period 1998–2015 and elevated the LNRPS during the period 1982–2015. Sardine spawns in the southern Sea of Japan from April to May, hence, delays of the spring bloom prolonged its overlap with sardine larval periods, and thus improved the recruitment of Japanese sardine in the Sea of Japan.  相似文献   

Identification of bitterness-masking compounds from cheese     

Homma R  Yamashita H  Funaki J  Ueda R  Sakurai T  Ishimaru Y  Abe K  Asakura T 《Journal of agricultural and food chemistry》2012,60(18):4492-4499

Bitterness-masking compounds were identified in a natural white mold cheese. The oily fraction of the cheese was extracted and further fractionated by using silica gel column chromatography. The four fractions obtained were characterized by thin-layer chromatography and nuclear magnetic resonance spectroscopy. The fatty acid-containing fraction was found to have the highest bitterness-masking activity against quinine hydrochloride. Bitterness-masking activity was quantitated using a method based on subjective equivalents. At 0.5 mM, the fatty acid mixture, which had a composition similar to that of cheese, suppressed the bitterness of 0.008% quinine hydrochloride to be equivalent to that of 0.0049-0.0060% and 0.5 mM oleic acid to that of 0.0032-0.0038% solution. The binding potential between oleic acid and the bitter compounds was estimated by isothermal titration calorimetry. These results suggest that oleic acid masked bitterness by forming a complex with the bitter compounds.  相似文献   

A quick incorporation of 13N into the soluble high-molecular compound in rice (Oryza sativa L.) roots by application of 13N-labeled nitrate/nitrite     

Tadakatsu Yoneyama  Nobuo Suzui  Noriko S. Ishioka  Shu Fujimaki 《Soil Science and Plant Nutrition》2013,59(4)

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Transpiration response of two bread wheat lines differing in drought resilience and their backcross parent under dry-down conditions     

Michael O. Itam  Ammar Wahbi  Haruyuki Fujimaki  Hisashi Tsujimoto 《Breeding Science》2021,71(5):575

Improving wheat productivity in drylands largely depends on how plants manage limited water resources. Using fraction of transpirable soil water threshold (FTSW_Th) and drought stress response function, we characterized the water conservation traits of two wheat multiple synthetic derivative lines (MSD53 and MSD345) which both contain introgressed segments from Aegilops tauschii but differ in drought resilience. The lines and their backcross parent, ‘Norin 61’, were subjected to dry-down conditions. MSD53 had a higher FTSW_Th for transpiration decrease than ‘Norin 61’ and MSD345. In terms of drought stress response function, MSD53 had the lowest threshold suction, suggesting a lower drought resilience capacity compared with MSD345. However, MSD53 exhibited an effective-water-use trait whereas MSD345 exhibited a water-saving trait under dry-down conditions. These results are consistent with the reported higher yield of MSD53 in comparison with MSD345 under drought stress in Sudan, and demonstrate that high FTSW_Th supports effective water use for improved agricultural productivity in drylands. The differences in water conservation traits between the two MSD lines may be attributed to variation in introgressed segments, which can be further explored for drought resilience breeding.  相似文献   

Analysis of mesh breaking loads in cotton gill nets: Possible solution to ghost fishing     

Yoshiki Matsushita  Shusuke Machida  Haruyuki Kanehiro  Fumio Nakamura  Naoto Honda 《Fisheries Science》2008,74(2):230-235

ABSTRACT:   A small number of fishers in Chiba Prefecture of eastern Japan use cotton gill nets to catch Japanese spiny lobster Panulirus japonicus. To examine the advantages of cotton gill nets, we analyzed changes in mesh breaking load of a new cotton gill net used in a fishing operation. A new cotton gill net was also soaked in a seawater tank to simulate ghost fishing conditions. The average mesh breaking load of new cotton mesh was 50.3 N. This value decreased to 19.0 N after 38 days (∼912 h), and after 82 days (∼1968 h) the mesh could be easily torn (breaking load 0.07 N). Under fishing conditions, the cumulative soak time was only 744.4 h over 19 months. The average breaking load at the end of this period was 43.1 N, a strength 86% that of the presoaked mesh. The mesh breaking load of a cotton gill net continuously soaked for 744.4 h was 26.1 N, as estimated from tank experiment data. Thus, a cotton gill net maintains reasonable strength under typical use conditions, but will degrade if lost at sea.  相似文献   

Identification and phylogenetic analysis of Babesia parasites in domestic dogs in Nigeria     

Haruyuki HIRATA  Temidayo OMOBOWALE  Olufunke ADEBAYO  Nodoka ASANUMA  Asako HARAGUCHI  Yoshiki MURAKAMI  Kodai KUSAKISAKO  Keiko IKEDA  Mitsuhiko ASAKAWA  Kazuyuki SUZUKI  Chiaki ISHIHARA  Hiromi IKADAI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2022,84(3):338

The present study examined the presence of Babesia parasites in 104 domestic dogs in Nigeria. Sequentially, Babesia parasites infecting domestic dogs underwent genetic and phylogenetic analyses. The results of nested PCR based on the Piroplasmida 18S rRNA gene illustrated that 13.5% (14/104) of the samples were positive. The obtained positive samples determined the nucleotide sequences of the 18S rRNA genes. In the genetic and phylogenetic analyses, four of five nucleotide sequences were similar to Babesia canis rossi, and one sample exhibited a close similarity to a Babesia sp. isolated from a raccoon in Hokkaido, Japan. The present study revealed the widespread presence of B. canis rossi among domestic dogs in Nigeria.  相似文献   

Malignant fibrous histiocytoma in a fox     

Y Fujimaki  M Sugiyama  M Isoda 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1985,47(1):147-150

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The juvenile form of Centrorhynchus elongatum Yamaguti, 1935     

M Machida  Y Fujimaki 《The Japanese journal of veterinary research》1965,13(3):85-86

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