
Ohtake NorikuniNiigata University · Faculty of Agriculture
Ohtake Norikuni
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Publications (174)
Nitrogen (N) is an essential determinant of strawberry growth and productivity. However, plants exhibit varying preferences for sources of nitrogen, which ultimately affects its use efficiency. Thus, it is imperative to determine the preferred N source for the optimization of indoor strawberry production. This study employed the 15N-tracer techniqu...
Citation: Salisu Jibia, S.; Panjama, K.; Inkham, C.; Sato, T.; Ohtake, N.; Ruamrungsri, S. Interactive Effects of LED Spectrum and Nitrogen Levels on Physiological Changes and Yield of Strawberry (Fragaria × ananassa Duch.). Plants 2025, 14, 89. https:// Abstract: Strawberries are valued globally for their nutritional, aesthetic, and economic benef...
Nitrogen (N) is an essential determinant of strawberry growth and productivity. However, plants exhibit varying preferences for nitrogen sources, which ultimately affects its use efficiency. Thus, it is imperative to determine the preferred N source for the optimization of indoor strawberry production. This study employed the ¹⁵N-tracer technique t...
Strawberries are valued globally for their nutritional, aesthetic, and economic benefits. Optimizing blue-to-red LED ratios and nitrogen levels is essential for sustainable indoor strawberry cultivation. This factorial study investigated the effects of blue and red LED combination ratios (L1; 1:3, L2; 1:4, and L3; 1:6) and nitrogen levels (N1; 100...
This study analyses the dynamic development of soybean (Glycine max (L.) Merr.) breeding in Russia, particularly examining its historical development, status, and future predictions. With the global demand for vegetable protein rising, understanding Russia’s potential contribution becomes crucial. This research provides valuable insights, offering...
Bibliometric analysis is a commonly used tool to assess scientific collaborations within the researchers, community, institution, regions and countries. The analysis of publication records can provide a wealth of information about scientific collaboration, including the number of publications, the impact of the publications, and the areas of resear...
Concern that depletion of fertilizer feedstocks, which are a finite mineral resource, threatens agricultural sustainability has driven the exploration of sustainable methods of soil fertilization. Given that microalgae, which are unicellular photosynthetic organisms, can take up nutrients efficiently from water systems, their application in a biolo...
Deep placement of coated urea, lime nitrogen (Lime N), or urea with a nitrification inhibitor, 3,4-dimethylpyrazole phosphate (DMPP-U) did not inhibit N fixation activity, and it promoted soybean growth and seed yield. However, the effect of deep placement on the N budget including N leaching has not been evaluated. In this research, soybean plants...
Vanda is an economically important orchid that is widely produced in Thailand. Usually, growers apply large amounts of fertilizer throughout the plant, covering the leaves and roots to ensure good quality products. Nitrogen fertilizer, in terms of ammonium (NH4+) and nitrate (NO3−), is generally used as an N source. In addition, nitrogen organic fe...
Background and Objective
Nitrogen fertilizer applied as top‐dressing to rice plants before flowering affects the yield and quality of rice grains. However, little is known about the effects of varying dosages of nitrogen at this stage on the brewing properties of sake using the rice grains. To explore this topic, we cultivated the sake rice cultiva...
Soybean plants require a large amount of nitrogen either from nitrogen fixation in nodules or nitrogen absorption from roots. It is known that nitrate, a major inorganic nitrogen compound in upland soils, represses nodule growth and nitrogen fixation. Rapid and reversible inhibition of nodule growth and nitrogen fixation activity was found in the h...
The waste sludge from food factories has rich nutrients and useful material for fertilizer or animal feed, but quick treatments and recycling of the waste sludge are difficult due to its higher water content. We have developed a rapid composting system to make sludge fertilizer using mix of waste sludge and shredded newspaper (Sludge Fertilizer Mad...
To investigate the potential of fluorescence spectroscopy in evaluating soybean protein and oil content, excitation emission matrix (EEM) was measured on 34 samples of soybean flours using a front-face measurement, and the accuracy of the protein and oil content prediction was evaluated. The EEM showed four main peaks at excitation/emission (Ex/Em)...
Soybean (Glycine max (L.) Merr.) plants form root nodules and fix atmospheric dinitrogen, while also utilizing the combined nitrogen absorbed from roots. In this study, nodulated soybean plants were supplied with 5 mM N nitrate, ammonium, or urea for 3 days, and the changes in metabolite concentrations in the xylem sap and each organ were analyzed....
The use of soy sauce cake as a fertilize and agricultural materials. This article is written in Japanese.
Soy sauce cake, a waste product by a soy sauce production, contains a high concentration of protein, so it is a good
material for animal feeds and fertilizers. However, soy sauce cake contains a high concentration of salt (NaCl), so the
application of a high amount of soy sauce cake as a fertilizer may induce salt stress of the crops and salt accum...
It has been reported that supply of nitrate to culture solution rapidly and reversibly inhibits nodule growth and nitrogen fixation activity of soybean. In this study, the effects of ammonium, urea, or glutamine on nodule growth and nitrogen fixation activity are compared with that for nitrate. Soybean plants were cultivated with a nitrogen-free nu...
Photos of root systems with various N treatments for 1 week (Experiment 4). White square is 3 cm × 3 cm.
Dry weight of nodules (A) after 2 weeks of N treatments, and the increase in the volume of three selected nodules in the first and the second week (B) (Experiment 4). Averages and standard errors are shown (n = 3). Different letters above the column indicate significant differences at <0.05 by Tukey’s test.
Dry weight of each organs after 2 weeks of various N treatments (Experiment 4).
SPAD value of the second, third, and fourth trifoliolate leaves after 2 weeks of various N treatments (Experiment 4). Averages and standard errors are shown (n = 3). Different letters above the column indicate significant differences at <0.05 by Tukey’s test.
Percentage distribution of 13C among each tissue of soybean plants (Experiment 3).
Total leaf area per a plant after 2 weeks of various N treatments (Experiment 4). Averages and standard errors are shown (n = 3). Different letters above the column indicate significant differences at <0.05 by Tukey’s test. ∗Indicate significantly differences between control at <0.05 by Student’s T-test.
Dry weight of each tissue of soybean plants (Experiment 3).
Percentage distribution of 15N labeled source among each tissue of soybean plants (Experiment 3).
Relative concentration of free amino acids in each tissue of soybean plants treated with N compounds relative to control plants (Experiment 3).
13CO2 injection into a plastic bag covering the plant shoot (Experiment 3) (A). CO2 concentration was monitored by infrared CO2 analyzer (B).
Nodule number per single plant at 17 DAP supplied with various nitrogen compounds from 12 to 17 DAP (Experiment 1). Averages and standard errors are shown (n = 4). Different letters above the column indicate significant differences at <0.05 by Tukey’s test.
Photos of shoot organs with various N treatments for 2 week. White square is 3 cm × 3 cm (Experiment 4).
Nitrogen concentration of free amino acids in each tissue of soybean plants treated with N compounds for 3 days (Experiment 3).
The deep placement of urea fertilizer (DMU) containing 1% (W/W) of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on soybean growth and seed yield was as effective as those of the coated urea (CU) and lime nitrogen (LN) in a field research. The average seed yields were high in LN (464 g·m ⁻² ) and DMU (461 g·m ⁻² ) and relatively...
Vanda is an important ornamental tropical orchid in Thailand and shows great potential in international markets. Since there has been limited research on flowering processes and regulations, flower production programs cannot be properly managed. To understand the genetic mechanisms in the Vanda flowering process, the ortholog of the FLOWERING LOCUS...
Leguminous plants form root nodules with rhizobia that fix atmospheric
dinitrogen (N2) for the nitrogen (N) nutrient. Combined
nitrogen sources, particular nitrate, severely repress nodule growth
and nitrogen fixation activity in soybeans (Glycine max [L.] Merr.).
A microarray-based transcriptome analysis and the metabolome
analysis were carried ou...
Vanda is an aerial tropical orchid native to Thailand and nitrogen (N) fertilizer is mainly used to promote its growth and quality. However, little is known about the characteristics of N absorption and assimilation in Vanda. The objective of this study was to determine the appropriate source of N for Vanda cultivation. In this experiment, shoots a...
Soybean plants can fix atmospheric dinitrogen (N2) in root nodules by the association with soil bacteria rhizobia. Soybeans also absorb soil N from the roots, mainly in the form of nitrate in the upper fields. However, it has been known that nitrate strongly inhibits nodulation, nodule growth and nitrogen fixation activity of soybean nodules. Many...
Leguminous plants form root nodules with rhizobia that fix atmospheric dinitrogen (N₂) for the nitrogen (N) nutrient. Combined nitrogen sources, particular nitrate, severely repress nodule growth and nitrogen fixation activity in soybeans (Glycine max [L.] Merr.). A microarray-based transcriptome analysis and the metabolome analysis were carried ou...
Soybean is an important crop for human food and feed for livestock. World soybean production is increasing especially in North and South America. Soybean seeds contain a high percentage of protein about 35–40%, and they require a large amount of nitrogen compared with other crops. Soybean plants make root nodules with rhizobia, and rhizobia can fix...
An adequate supply of nitrogen (N) is important for Patumma growth and flower quality. This study aimed to compare the uptake and translocation of N by foliar and root application. Fertilization with ¹⁵ nitrate (NO3)-N via roots or leaves was carried out at four stages, at the 1st to 4th fully expanded leaf (FEL) stages, and the plants were sampled...
Anatomical characteristics of Curcuma alismatifolia Gagnep have been rarely studied, especially those of roots and leaves which are involved in nutrient uptake. Fertilization for production of C. alismatifolia is supplied both via roots and leaves. Therefore, this research aimed to study the anatomy of both organs by paraffin embedding and light mi...
Curcuma alismatifolia rhizomes are exported to world markets for ornamental use. Rhizome size and the number of storage roots affected shoot sprouting, plant growth, and inflorescence yield and quality, indicating an important role for storage food reserves such as the carbohydrates and proteins in these organs. An understanding of the proteins use...
The application of combined nitrogen, especially nitrate, to soybean plants is known to strongly inhibit nodule formation, growth and nitrogen fixation. In the present study, we measured the effects of supplying 5 mM nitrate on the growth of nodules, primary root, and lateral roots under light at 28 °C or dark at 18 °C conditions. Photographs of th...
Curcuma alismatifolia has become popular as an ornamental plant because of its colourful, long-lasting, and repeated growth of inflorescences.The effects of temperature on N and C assimilation and transport during the initial flowering stage were investigated using 15N and 13C. Treatments at 15ºC, 25ºC, or 35ºC had no significant effect on total 15...
The quantitative analysis of the initial transport of fixed isotope 15-nitrogen (15N) in intact nodulated soybean plants (Glycine max [L.] Merr. cv. Williams) was investigated at the vegetative stage (36 days after planting, DAP) and pod-filling stage (91 DAP) by the 15N pulse-chase experiment. The nodulated roots were exposed to N2 gas labeled wit...
Tulip (Tulipa gesneriana, cultivar Oxford) bulbs were planted in October and grown in culture solution in a glasshouse under natural conditions. One group was cultivated in a solution containing nitrogen (N) (+N treatment: nitrate-N (N) 12.0, ammonium-N (−N) 3.0 mg L). Another group was cultivated in a nitrogen-free solution (−N treatment). In the...
The effects of different temperatures (30/24 o C and 30/18 o C day/night temperatures) and N sources; nitrate (NO 3 -), ammonium (NH 4 +), mixed-N source (50 NO 3 -:50 NH 4 +) in the nutrient solution on growth and N assimilation of Curcuma alismatifolia was studied in a soil-less culture medium. Plant grew taller when grown under the 30/24ºC treat...
Curcuma alismatifolia Gagnep. rhizomes were planted on 15 May 2007. At 10 weeks after planting, at the termination of the new leaf formation stage, the plants were supplied with 15 N-labeled culture solution (3.81 mM NH 4 + + 8.96 mM NO 3 -: 10.6 atom% 15 N) twice at 3 and 1 days before 13 CO 2 feeding. Then 13 C-labeled 13 CO 2 (99 atom% 13 C) was...
We determined the critical nitrogen (N) level in field-grown Curcuma alismatifolia Gagnep. by applying N at a rate of 3.75, 7.5, 15, 30, and 60 g N plant –1 as urea. Plant growth and N critical levels were determined 105 d after planting (flowering stage). To establish critical N levels in plant tissue, the relationship between rhizome yield and th...
The purpose of this work was to investigate the change of MIR characteristics of rice in storage using FT-IR/ATR spectroscopy. Firstly, grain number in the FT-IR/ATR measurement was examined to obtain the average spectral information of rice grain. In the experiment, measurement of 300 grains was performed and its spectrums were analyzed. As a resu...