Japanese Journal of Farm Work Research
Online ISSN : 1883-2261
Print ISSN : 0389-1763
ISSN-L : 0389-1763
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Volume 39, Issue 3
Displaying 1-6 of 6 articles from this issue
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  • GA3 Application Timing at Flowering Stage for Enlargement of Seedless Berries Induced by Streptomycin in the ‘Fujiminori’ Grape
    Kazunori ISHIKAWA, Tadashi BABA
    2004 Volume 39 Issue 3 Pages 135-142
    Published: September 15, 2004
    Released on J-STAGE: February 09, 2010
    DOIhttps://doi.org/10.4035/jsfwr.39.135
    JOURNAL FREE ACCESS
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    An experiment was conducted to extend the timing of GA3 application at flowering stage for enlargement of seedless berries induced by streptomycin in grape ‘Fujiminori’. GA3 25ppm or 2.5ppm was applied to flower clusters at different dates during the flowering stage, followed by an application of GA3 25ppm or a combination of GA3 (50ppm or 100ppm) and 1-(2-chloro-4-pyridyl)-3-phenylurea (10ppm) at about 10 days after flowering. All treatments resulted in nearly 100% seedless and enlarged berries. However, the earliest and latest application of GA3 resulted in cases of bent rachis or a significant reduction in Brix of the flesh. No such damages were detected on the berries and clusters when GA3 was applied in the 3 day interval before and after full-bloom. The extended timing of GA3 application may allow growers to regulate and disperse their peak labor requirements.
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  • Supplementation of Fertilizer Efficiency of Dairy Cattle Slurry by Recycled Dry Chemical Extinguishing Agents
    Masayuki TANI, Naohisa SAKAMOTO, Tadashi KISHIMOTO, Kazutaka UMETSU, T ...
    2004 Volume 39 Issue 3 Pages 143-150
    Published: September 15, 2004
    Released on J-STAGE: February 09, 2010
    DOIhttps://doi.org/10.4035/jsfwr.39.143
    JOURNAL FREE ACCESS
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    Plant growth experiments in pots were conducted to evaluate methods to supplement the efficiency of fertilizer in dairy cattle slurry by dissolving recycled dry chemical extinguishing agents (DC) in the slurry and also by adding chemical fertilizers (CF) to slurry that is applied to grass and vegetables. The yield and fertility efficiency of timothy and greens (Komatsuna) in DC and CF plots were compared with those in a plot in which only chemical fertilizers were applied (CL). The experiments used four types of slurry (fresh, aerobically digested, anaerobically digested, and stored at a dairy farm). The yield of timothy, whether with DC or CF, was almost always equal to or more than the yield of CL. The digested slurry with DC led to the highest yield. The yield of Komatsuna in DC was more than that of CF or that of CL across all slurry types. The nitrogen and potassium efficiency of timothy differed little from plot to plot. The phosphate efficiency with DC was remarkably higher than in other plots. The fertilizer efficiency on Komatsuna, whether with DC or CF, was higher than that with CL. The supplementation of the fertilizer efficiency of dairy cattle slurry by the dissolution of DC is found to be quite effective, as it sustains yields that nearly equal or even exceed those with the application of chemical fertilizers. Additionally, the recycling of fertility resources increases the efficiency of agricultural operations, reduces labor, and reduces the costs of chemical fertilizers.
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  • Effect of soil clod-size on the Emergence and Growth in Some Crops
    Yumei SUN, Michiaki ITO, Hajime ARAKI, Yoneji YAMASHITA
    2004 Volume 39 Issue 3 Pages 151-156
    Published: September 15, 2004
    Released on J-STAGE: February 09, 2010
    DOIhttps://doi.org/10.4035/jsfwr.39.151
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    Five crops with different seed size, corn (Zea mays), soybean (Glycine max), Japanese radish (Raphanus sativus), carrot (Daucus carota) and komatsuna (Brassica rapa), were used in the present examination. With the aim of clarifying the effectiveness of soil clod-size on emergence and early growth of these crops, emergence ratio, plant length and dry weight of top and root were measured using wagner pot (1/2000a) contained with 5 levels of soil clod-size, <4mm, 4-10mm, 10-20mm, 20-40mm and 40-50mm in diameter. Emergence ratio in any crops decreased as soil clad-size was large, especially in carrot. Emergence ratio was inhibited in the 20 mm-soil clod in corn and soybean that produce large seed, however, it was inhibited in 10mm soil clod in carrot that has small and flat seed. There is not a significant difference in plant length and top dry weight in all crops among the soil clad-size less than 40mm. On the other hand, root dry weight became small as soil clod-size was large, and soil clod-size affected the root growth more than top growth comparatively. From these result, it is necessary to prepare the soil clod less than 10mm in seeding ditch to obtain high emergence ratio and vigorous early growth for all crops in reduced tillage.
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  • Use of Cover Crops in Upland Fields
    Masakazu KOMATSUZAKI
    2004 Volume 39 Issue 3 Pages 157-163
    Published: September 15, 2004
    Released on J-STAGE: February 09, 2010
    DOIhttps://doi.org/10.4035/jsfwr.39.157
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  • Use of Cover Crops in Lowland Rice Cultivation
    Hideto UENO
    2004 Volume 39 Issue 3 Pages 165-170
    Published: September 15, 2004
    Released on J-STAGE: February 09, 2010
    DOIhttps://doi.org/10.4035/jsfwr.39.165
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  • Weed and Tillage
    Kiyoshi TAJIMA
    2004 Volume 39 Issue 3 Pages 171-173
    Published: September 15, 2004
    Released on J-STAGE: February 09, 2010
    DOIhttps://doi.org/10.4035/jsfwr.39.171
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