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Volume 72 (2001)
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- Issue 5 Pages 603-
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- Issue 3 Pages 311-
- Issue 2 Pages 147-
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Volume 72, Issue 3
Displaying 1-41 of 41 articles from this issue
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Article type: Cover
2001 Volume 72 Issue 3 Pages Cover1-
Published: June 05, 2001
Released on J-STAGE: June 28, 2017
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Article type: Cover
2001 Volume 72 Issue 3 Pages Cover2-
Published: June 05, 2001
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Article type: Appendix
2001 Volume 72 Issue 3 Pages App1-
Published: June 05, 2001
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Improvement of Crop Production in the Tropics through Elucidation of Nitrogen Nutrition of the CropsO. ITOArticle type: Article
2001 Volume 72 Issue 3 Pages 311-314
Published: June 05, 2001
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M. OKAZAKIArticle type: Article
2001 Volume 72 Issue 3 Pages 315-318
Published: June 05, 2001
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S. YOSHIDAArticle type: Article
2001 Volume 72 Issue 3 Pages 319-322
Published: June 05, 2001
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Y. TAKAHASHIArticle type: Article
2001 Volume 72 Issue 3 Pages 323-326
Published: June 05, 2001
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N. MIZUNOArticle type: Article
2001 Volume 72 Issue 3 Pages 327-330
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H. KOYAMAArticle type: Article
2001 Volume 72 Issue 3 Pages 331-332
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H. SHIBATAArticle type: Article
2001 Volume 72 Issue 3 Pages 333-334
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F. TANAKAArticle type: Article
2001 Volume 72 Issue 3 Pages 335-336
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E. FUJISAWAArticle type: Article
2001 Volume 72 Issue 3 Pages 337-338
Published: June 05, 2001
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T. MAKINOArticle type: Article
2001 Volume 72 Issue 3 Pages 339-340
Published: June 05, 2001
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Takahide KIKUCHI, Hitoshi SEKIMOTOArticle type: Article
2001 Volume 72 Issue 3 Pages 341-347
Published: June 05, 2001
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JOURNAL FREE ACCESSTo clarify a practical treatment for the production of high quality spinach with reduced nitrate content, we conducted a trial using acetate instead of sulfate and chloride as nutrient salts in the water culture. The treatment (1.5 mM) of acetate for 2 d before harvest obtained the same yield as the control and nitrate content was decreased up to 23% from the control. In contrast, the acetate treatment did not affect the content of oxalate, however ascorbic acid content was inclined to increase with the treatment.View full abstractDownload PDF (757K) -
Masayuki TANI, Renzo KONDO, Kiyoshi TSUTSUKIArticle type: Article
2001 Volume 72 Issue 3 Pages 348-356
Published: June 05, 2001
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSSurface peat pore waters were collected from Sarobetsu peatland, Kiritappu peatland, Bekanbeushi peatland and Tokachi coastal peatland in Hokkaido, Japan. The concentrations of dissolved organic matter (DOM) and dissolved iron in peat pore waters, and their relation to the several physical and chemical properties, and the indices for the decomposition degree of peat samples, were investigated. The concentrations of dissolved organic carbon (DOC) and chemical oxygen demand (COD) were higher in the peat waters of Sarobetsu peatland and Bekanbeushi peatland, which cover relatively wide areas. In contrast, they were lower in those of Tokachi coastal peatland, where the effect of an incorporation of inorganic materials was distinct. In general, DOC had a signitificant correlation with the decomposition degree and organic matter content of peat samples. The concentrations of dissolved iron were also higher in peat waters of Sarobetsu peatland, followed by those of Kiritappu peatland and Bekanbeushi peatland, and lower in those of Tokachi coastal peatland. When the peat waters were passed through the reverse-phase cartridge column to remove hydrophobic fractions of DOM, the percolated waters, which were almost transparent and colorless, still had strong absorption at 260 nm and were rich in dissolved iron. It was suggested that dissolved iron in peat waters had a significant relationship with colorless and hydrophilic organic fractions in DOM. The multiple-regression analysis showed that the concentrations of dissolved iron increased with the increase in the concentrations of DOM as the peat decomposed, which concentrations were abundant in carboxylic autd phenolic-hydroxyl groups. It was also revealed that dissolved iron in peat waters increased with the increase in contents of both organic matter and iron in peat samples, and with the decrease in the fiber contents. The concentrations of dissolved iron in peat waters were mutually affected by organic matter and iron contents of peat soils, being dependent on an incorporation of mineral materials and the degree of decomposition of peat soils.View full abstractDownload PDF (1076K) -
Toshihiko KARASAWA, Yoshiaki KASAHARA, Masako TAKEBEArticle type: Article
2001 Volume 72 Issue 3 Pages 357-364
Published: June 05, 2001
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSIt is known that cultivation of non-mycorrhizal host crops results in a decline in frequencies of arbuscular mycorrhizal (AM) infection and growth of succeeding crops. However, such crops need to be cultivated in rotation. To establish an effective farming system for improving the growth of succeeding crops, we investigated the effect of green manure using AM host crops on maize production in terms of AM symbiosis under field conditions. After oat (an AM host crop with a low frequency of AM infection) cropping, sunflower, vetch or mustard seeds were sown as green manure on August 7,1996. To determine the seasonal change in infection activity of AM fungi, sunflower seeds were also sown on September 9 and October 11. Each green manure crop was harvested (unincorporated) or incorporated on November 5. In the following season, maize was grown in plots after sunflower, vetch or mustard cropping and in a plot after fallowing. The infection frequency of AM fungi and the shoot weight and yield of maize grown after AM host (sunflower and vetch) cropping were much higher than those after fallowing and nonhost (mustard) cropping. Furthermore, the growth of succeeding maize was unaffected by incorporation of green manure crops. These results suggest that the increased AM fungal populations during cultivation of AM host crops improved the efficiency of AM colonization in the following season and that this brought about the positive effects of sunflower and vetch cropping. Sunflowers sown after September did not improve the growth of succeeding maize. Since the frequency of AM infection of sunflowers sown after September was very low, it is thought that sunflower cropping after September did not increase sizes of AM populations in the soil. Therefore, AM host crops need to be sown in August to improve the AM colonization and the growth and yield of succeeding crops when nonhost crops or host crops with low frequency of AM infection have been grown in the field.View full abstractDownload PDF (985K) -
Yasuhiro NAKANISHI, Kaneshi TAKAHIRA, Kuniki SHIMOJIArticle type: Article
2001 Volume 72 Issue 3 Pages 365-371
Published: June 05, 2001
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSNitrogen loading factors, the ratios of nitrogen loading into groundwater, were estimated by multiple regression analysis on Miyako Isl., Okinawa, Japan. Geologically, the island is simply made of uplifted coral stones with the underlying unpermeable mud rocks, and the groundwater basins are separated mainly by faults itto 22. We carefully chose 9 study basins, taking account mainly of uncommunicativeness as a groundwater basin. In the regression analysis, the annualamount of nitrogen supplied to the basin environment, deriving from fertilizers, livestock wastes and domestic wastes were used as the predictor variables and the amount of nitrogen in the groundwater calculated by using surveyed concentration of nitrogen in groundwater as the criterion variables. As a result, the nitrogen loading factors of fertilizers, livestock wastes and domestic wastes were estimated at 40.0,44.1 and 68.9%, and the levels of significance were 0.3,8.3 and 56.5%, respectively.View full abstractDownload PDF (868K) -
[in Japanese]Article type: Article
2001 Volume 72 Issue 3 Pages 371-
Published: June 05, 2001
Released on J-STAGE: June 28, 2017
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Yasuhiro NAKANISHI, Masakatsu IKEMAArticle type: Article
2001 Volume 72 Issue 3 Pages 372-378
Published: June 05, 2001
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSThe amount and origins of nitrogen supplied in environment and groundwater were calculated for Shirakawata, Higashi-soedo and Hukusato groundwater basins from where drinking water is taken on Miyako Isl., Okinawa, Japan. The concentrations of inorganic nitrogen were surveyed monthly in 1995-1999 for groundwater in the basins. Also, nitrogen removal by forest was estimated by analyzing the correlation of surveyed/estimated ratio of groundwater nitrogen concentration with the forest area ratio. The amount of nitrogen supplied in the environment in the basins was calculated as 109.9-130.8 kg N ha^<-1> y^<-1>, of which 57.5-6l.6% was derived from fertilizers and 22.0-30.2% from livestock wastes. The surveyed concentrations of nitrogen in groundwater in the respective basins were 5.32,5.58 and 7.01 mg L^<-1>. The estimated concentrations of nitrogen were 7.89,6.77 and 7.65 mg L^<-1>, respectively, of which 48-50% was derived from fertilizers and 20-28% from livestock wastes. The forest area ratios in the basins were 24.2,19.8 and 14.2%, respectively. The correlation mentioned above was negative (y=- 4O.23x+51.77,R=0.980) and the capacity of nitrogen removal by forest was estimated at 36-84 kg N ha^<-1> y^<-1>.View full abstractDownload PDF (835K) -
Shigekazu YAMAMURO, Hideto UENO, Shigeru TAKAHASHI, Satoshi MORITA, Ka ...Article type: Article
2001 Volume 72 Issue 3 Pages 379-384
Published: June 05, 2001
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSIn rice cultivation, assimilation rate of carbon dioxide at ripening stage is considered to be one of the most important factors which influences the percentage of ripened grain. By using two different rice plants, Oryza sativa L., cv. Hoshiyutaka and Akenohoshi, that had a high and a low percentage of ripened grain, respectively, the ^<13>C-tracer method was examined for its suitability as an evaluation method for the capacity of carbon dioxide assimilation and the translocation of the products. At the heading stage, it was observed in the both varieties that the higher order of the leaf assimilated a larger amount of ^<13>CO_2. Hoshiyutaka had a higher rate of^<13>CO_2,assimilation and translocation to its leaf sheath, culm and ear than Akenohoshi. In particular, Hoshiyutaka kept a higher assimilation rate even in its lower leaf. At the ripening stage, a higher amount of photosynthetic product remained in Hoshiyutaka, which had been assimilated and translocated for 4 d. In the case of Akenohoshi, a preferential translocation of the products was performed in the superior spikelets of the upper and lower rachilla in spite of nearly reaching to their ripening capacity. In contrast, a low translocation rate in the inferior spikelets led to an insufficient restoration of the product. On the other hand, in the case of Hoshiyutaka, a reasonable translocation of the products was performed. It was considered that the differences in these characteristics on the capacity of CO_2 assimilation and translocation reflected the percentages of their grain ripened. These results indicated the usefulness of the CO_2 exposing method in the evaluation of rice plant species which varied in the capacity of assimilation and translocation of photosynthetic products, especially, at the ripening stage.View full abstractDownload PDF (725K) -
Reduction of Blossom-End Rot Rate of Tomato Fruits by Amendment of the Rhizosphere Using FertigationAkimasa NAKANO, Yoichi UEHARA, Akira YAMAUCHIArticle type: Article
2001 Volume 72 Issue 3 Pages 385-393
Published: June 05, 2001
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSThe occurrence of blossom-end rot (BER) in tomato (Lycopersicon esculentum Mill.var.Saturn) was reduced using an inorganic or organic fertigation method. In the conventional basal dressing method, calcium content of the fruit was decreased in spite of sufficient calcium content in soil, xylem sap and leaf parts. The occurrence of BER had negative correlation with bleeding rate, hence bleeding rate, which is an index integrating various factors such as rhizosphere condition, root length and root activity, might be used as an indicator of the occurrence of BER. Soil EC values affected bleeding rate more heavily than soil compaction and soil water content did. The roots of plants grown with the fertigation method tended to be confined to the dripped soil parts, which reduces soil chemical stress, and calcium uptake driven by water flux was increased. In particular the supply of calcium in the period of fruit enlargement-at night-met the demand in inorganic and organic fertigation with a higher bleeding rate than for the basal dressing method, which led to a reduction in the occurrence of BER in tomato fruits.View full abstractDownload PDF (1199K) -
Junko SHINDO, Takejiro TAKAMATSU, Tamon FUMOTOArticle type: Article
2001 Volume 72 Issue 3 Pages 394-402
Published: June 05, 2001
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSA dynamic model predicting soil acidification was applied to field measurements to evaluate the model applicability as a tool for identifying buffering mechanisms regulating soil chemistry changes. Temporal changes of pH and ion concentrations of soil solutions were estimated with a model for two sites that were a red pine stand in Kannondai, Tsukuba, and a deciduous stand in Yasato, regarding percolated water through litter layers as acid load to the soil. Nutrient uptakes by plant, mineral weathering, organic matter mineralization, etc., were treated in the lump as the consumption or production of the elements. Assuming a constant net consumption rate by these processes, prediction of changes in nitrate and base cation concentrations corresponded well to the measurements for Kannondai. Seasonal change in nutrient uptake was considered to offset the changes in mineral weathering and organic matter mineralization. On the contrary, seasonal changes in the net consumption rates had to be introduced in order to reproduce the measured values in Yasato. This suggested the larger contribution of the seasonal changes in nutrientent uptake to the soil chemistry changes in the deciduous stand. The virtual simulation without taking each buffering mechanism into consideration indicated that the cation exchange process was primarily important for the prediction of soil solution pH.View full abstractDownload PDF (1112K) -
Effect of Top-Dressing of Nitrogen Fertilizer after Anthesis on Nitrogen Accumulation in Wheat GrainHideya KIMURA, Motoko SHIMURA, Minoru YAMAUCHIArticle type: Article
2001 Volume 72 Issue 3 Pages 403-408
Published: June 05, 2001
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSThe protein content of wheat grain produced in Kinki and Chugoku district (western warm part) of Japan is low and the objective of this study was to investigate the effect of a top-dressing of nitrogen fertilizer after anthesis on nitrogen accumulation and protein composition in wheat grain. The results are summarized as follows : 1) Wheat protein content and grain liter weight were increased by nitrogen top-dressing after anthesis without changing stem length, ear length or yield. Though little difference in soil nitrogen content was detected between the fields with and without rice straw incorporation, growth and grain yield were decreased by the incorporation. 2) The accumulation of nitrogen in grain was approximately 70% of the absorbed nitrogen in a plant. On the contrary, 90% of nitrogen top-dressed after anthesis accumulated in grain. There was little difference in top-dressing nitrogen absorption in plant between 18 d after fertilization and harvest time. This indicated that the absorption of top-dressed nitrogen was completed before 18 d after fertilization. Accumulation rate of top-dressed nitrogen in grain at harvest time was approximately 40%. 3) Analysis of nitrogen accumulation in grain among the solvent extracted fractions, i.e. low molecular weight protein, gliadin, glutenin and insoluble fractions, revealed that top-dressed nitrogen did not specifically accumulate in the low molecular weight protein fraction, accumulating more in the gliadin fraction. The nitrogen accumulation in gliadin increased with the increase in grain protein content.View full abstractDownload PDF (808K) -
Shigetoshi MURAYAMA, Michio KOMADA, Koji BABA, Akito TSUMURAArticle type: Article
2001 Volume 72 Issue 3 Pages 409-419
Published: June 05, 2001
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSMonitoring of water quality on dry weather days was carried out throughout one year to learn the characteristics and the seasonal changes in water quality of small rivers in a rural agricultural catchment area. The river is about 2.5 km long (catchment area ; 292 ha) and finally reaches Lake Kasumigaura through the Kawamata River, and then the Koise River. For comparison, monitoring of the quality of mountain stream water, ponding water of a paddy field, irrigation water piped to the monitored river from the Lake Kasumigaura and domestic waste water flowing into the river from an agricultural community were also carried out. The following water characteristics were analyzde : flow rate of the river, SS and pH, EC, IC, DOC, COD, OD_<260>, Si, NH_4^+, Na^+, K^+, Mg^<2+>, Ca^<2+>, NO_3^- , SO_4^<2->, Cl^-, Br^- and PO_4-P for the filtrate of under 1.0 μm. 1) The quality of river water in the non-irrigation season was supposed to be influenced by both the inflow of domestic wastewater and the cultivated upland field, and EC and concentration of SS and almost all of the components were increased by flow down from the mountain stream to the middle reaches. However, the changes in water quality of each sampling point were not very large except for NO_3^- and PO_4-P. 2 ) During the irrigation season, the water quality of each sampling point was influenced fairly strongly by inflow of Lake Kasumigaura water resulting in increased concentration of DOC, COD, Cl^- and Br^-, and in greatly decreased concentration of Si. 3) A higher concentration of DOC, COD and SO_4^<2> was observed in ponding water, particularly in soil puddling and rice transplanting time. Concentration of HCO_3^- was decreased soon after irrigation started, then at soil puddling and rice transplanting time, probably by lowering of the water pH. 4) Correlation among the 19 analyzed components was calculated and tabulated as a correlation coefficient matrix. 5) Cation and anion composition were calculated by the equivalent concentration for the non-irrigation season. By using the composition, the characteristics of the each water from different sampling points and the changes in the composition by flow down to the lower reaches were discussed. 6) Daily and annual out-flow loadings at the lower reaches of river water for SS and other components were calculated.View full abstractDownload PDF (1357K) -
Shigetoshi MURAYAMA, Michio KOMADA, Koji BABA, Akito TSUMURAArticle type: Article
2001 Volume 72 Issue 3 Pages 420-428
Published: June 05, 2001
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSMonitoring of trihalomethane formation potential (THMFP) of water of a small river in a rural agricultural catchment area on dry weather days was carried out throughout one year to ascertain the characteristics and the seasonal changes in THMFP. Points of water sample collection were as follows : mountain stream (source of the monitored river flowing out from Mt. Tsukuba), upper reaches, middle reaches and lower reaches of the small river which is about 2.5 km long (catchment area ; 292 ha) and empties finally into the Lake Kasumigaura by way of the Kawamata River, and then the Koise River. Additionally, during paddy cultivation period, sampling of a ponding water of a paddy field neighbouring the monitored river in the middle reaches, and irrigation water from Lake Kasumigaura, which flows into the monitored river by a pipeline systeun, was also carried out. The results can be summarized as follows : 1) Chlorine demand (Y mg L^<-1>) which yielded 1.0 mg L^<-1> of active residual free chlorine concentration after 24 h incubation was calculated by the following multiple regression equation by using the concentration of DOC (X_1 mg L^<-1>) and NH_4^+-N (X_2 mgL^<-1>) : Y = 1.32 X_1+11.35 X_2+1.39 (multiple correlation coefficient γ=0.909,n=72) and, when the concentration of Br^- (X_3 mg L^<-1>) was accounted for, the following equation was obtained : Y=1.37 X_1+11.31 X_2-2.16 X_3+1.42 (multiple correlation coefficient γ=0.902,n = 72) 2) THMFP of ponding water ranged from 103.6 to 188.4 μgL^ <-1>. During the irrigation season of paddy fields, THMFP of the river water sometimes slightly exceeded the governmental guideline for drinking water of 100 μg L^<-1> at the upper reaches and middle reaches of the river. However, during the non-irrigation season THMFP of the river water never exceeded the guideline concentration. The mean daily load of THMFP at the lower reaches of the river were 143.4 g and 779.3 g for the non-irrigation season and the irrigation season for paddy fields, respectively. 3) THMFP for unit weight organic carbon was observed to be higher in mountain stream water and ponding water, and to be lower in Kasumigaura irrigation water. But for overall sample water, THMFP (Y μg L^<1> ) was correlated to DOC (X_1 mg ^<-1>), COD (X_2 mg L^<-1> ) and the optical density at the wave length 260 nm (OD_<260>, X_3) of 1 cm optical path length, as follows, indicating the last one had the strongest correlation : Y=15.19 X_1 (γ=0.877,n=74) Y=11.65 X_2 (γ=0.928,n=74) Y=995.0 X_3 (γ=0.964,n=74) This suggests that THMFP of the filtered water of the agricultural catchment area could be simulated simply but roughly by the measurement of OD_<260>. 4) Composition of the trihalomethane produced by the chlorination process was affected by the ratio of DOC to Br^-, and CHCl_3 was more predominant for ponding water, contrasting to Kasumigaura irrigation water, which produced a relatively higher proportion of CHBr_2Cl and CHBr_3.View full abstractDownload PDF (1025K) -
Kazunori SAKAMOTO, Taeko HAGIWARAArticle type: Article
2001 Volume 72 Issue 3 Pages 429-431
Published: June 05, 2001
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Kei MOTONAGA, Kazuhiro TAKAGI, Satoshi MATSUMOTOArticle type: Article
2001 Volume 72 Issue 3 Pages 432-434
Published: June 05, 2001
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Hiroyuki MAKI, Toyomichi IWAI, Yoshihiko KOYAMAArticle type: Article
2001 Volume 72 Issue 3 Pages 435-438
Published: June 05, 2001
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Iwao KITAGAWA, Yoshio YOKOI, Eiji GOTOU, Katsuyuki SOMAArticle type: Article
2001 Volume 72 Issue 3 Pages 439-443
Published: June 05, 2001
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Shinya IWASAKI, Naruo MIYAZAKI, Seiji MORI, Hiroaki OMURAArticle type: Article
2001 Volume 72 Issue 3 Pages 444-448
Published: June 05, 2001
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Yoko UOKI, Shigeru NODAArticle type: Article
2001 Volume 72 Issue 3 Pages 449-452
Published: June 05, 2001
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Kazunobu TORIYAMAArticle type: Article
2001 Volume 72 Issue 3 Pages 453-458
Published: June 05, 2001
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Kazutake KYUMAArticle type: Article
2001 Volume 72 Issue 3 Pages 459-
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Hiroaki SUMIDAArticle type: Article
2001 Volume 72 Issue 3 Pages 460-
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Article type: Appendix
2001 Volume 72 Issue 3 Pages 461-
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Article type: Appendix
2001 Volume 72 Issue 3 Pages 461-
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Article type: Appendix
2001 Volume 72 Issue 3 Pages 462-472
Published: June 05, 2001
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[in Japanese]Article type: Article
2001 Volume 72 Issue 3 Pages 473-
Published: June 05, 2001
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Article type: Appendix
2001 Volume 72 Issue 3 Pages App2-
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Article type: Cover
2001 Volume 72 Issue 3 Pages Cover3-
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Article type: Cover
2001 Volume 72 Issue 3 Pages Cover4-
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