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Volume 32, Issue 1
Displaying 1-9 of 9 articles from this issue
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Hidenori TAKAHASHI, Shiro KOYAMA1976 Volume 32 Issue 1 Pages 1-4
Published: June 15, 1976
Released on J-STAGE: July 01, 2010
JOURNAL FREE ACCESSDistributions of ground temperature under a cow-house were measured to make clear the effects of the insulated foundation on the thermal environment in the cow-house.
The results obtained from this study were summarized as follows:
(1) The inside temperature of the foundation insulator was 2-3°C higher than the outside. But the temperature difference between inside and outside of foundation concrete was very small (Fig. 3).
(2) Heat flow through the insulated foundation was 3-6% in comparison with that through the wall above the ground (Table 1).
(3) The insulated foundation was useful to make warmer the outer edge of the floor (Fig. 4), and protected to condense the water vapor at the inner surface of foundation wall (Table 2).View full abstractDownload PDF (513K) -
Satoshi IWAKIRI1976 Volume 32 Issue 1 Pages 5-10
Published: June 15, 1976
Released on J-STAGE: July 01, 2010
JOURNAL FREE ACCESSThis study was made to clear the dependence of the yield of soybean crop on climatic conditions. In the analysis, the yield data of soybean crop obtained at about fifty districts in Japan during the period from 1954 to 1973 were used together with weather records for the same period.
The results obtained can be summarized as follows:
(1) The average yield of soybean crop during this period was higher in northern part of Japan, especially in Hokkaido than in other part of Japan. The average yield decreased gradually with the movement to lower latitude and reached the lowest value at a south-western part of this country. As shown in Fig. 1, the value of coefficient of variance of the yield in the middle part of Honshu was lower compared with those in northern and western part of this country.
(2) To characterize the climatic dependence of the yield of soybean crop (Y), the yield was divided by the mean value of solar radiation during the same responsible period (Q) and plotted against air temperature (T). The relationships presented in Fig. 2 were expressed approximately by the following quadratic equations
Y/Q1=-0.51+0.0821T1-0.00197T12,
and
Y/Q2=-1.01+0.1369T2-0.00336T22,
where suffixes 1 and 2 denote the quantities related to July-August period and August-September period, respectively. Although the value of coefficient of determination was not very high in the two cases, the mean air temperature during the period from August to September to which corresponds the stage of the pod developing, seems to be more influential on the yield of soybean.
(3) Figure 4 shows that the yield of soybean crop correlates inversely with the wetness index defined as the ratio of latent heat equivalent of daily rainfall (Lr, ly day-1) to daily solar radiation (Q, ly day-1). As can be seen in Fig. 4, the yield of soybean crop decreased slightly linearly with the increase of wetness index, in the range above 0.5 of Lr/Q, implying that soil moisture is less effective to the growth and the yield of soybean crop under the so humid climatic conditions as Japan.
(4) Figure 6 shows the dependence of the coefficient of variance of yield of soybean crop on the coefficient of variance of mean temperature during the period from July to August. The magnitude of correlation coefficient between both coefficients of variance is significantly higher in a northern district of Japan than that calculated for the whole area of Japan. This fact indicates clearly that the growth and the yield of soybean crop in a northern part of Japan with lower mean and higher variance of air temperature are greatly affected by yearly temperature regime in that district.View full abstractDownload PDF (772K) -
Seiji HAYAKAWA, Tsutomu SAKANOUE, Yushiro MOTODA, Shoichiro NISHI1976 Volume 32 Issue 1 Pages 11-17
Published: June 15, 1976
Released on J-STAGE: July 01, 2010
JOURNAL FREE ACCESSSignificant and sometimes devastating effects of agricultural exterminators on vegetation have long been recognized. Our purpose of this study is to present information of the effects of agricultural exterminators scattered in the field. Observation was carried out at Amagi Plain in Fukuoka Prefecture. Mulberry branches with leaves were set at network points. We scattered the fluorescent particles (F.P.) and agricultural exterminators simultaneously from a continuous point and a line source. We fed mulberry leaves to silkworms and examined the influence of agricultural exterminators on silkworms.
From the comparison of observed F.P. concentrations and degrees of injured silkworms with calculated concentrations by the diffusion equation for a finite line source, the following results are obtained:
1) The degrees of injured silkworms are in fair agreement with the concentration values calculated by a formula of the normal distribution type.
2) As for the damage of silkworms fed on the mulberry leaves contaminated with agricultural exterminators (cartap), much damage will occur for the accumulated concentration exceeding 1.06×10-1g/m2, medium damage for 4.17×10-2-1.06×10-1g/m2 and little damage for 1.22×10-3-4.17×10-2g/m2.
3) The damage of silkworms is very slight when they are fed on leaves set at the leeward of structures and bushes. It suggests an effect of vital significance by topography and roughness on the diffusion near the ground.
4) Before scattering agricultural exterminators, special care must be taken to wind speed, wind direction and atmospheric stability.View full abstractDownload PDF (3712K) -
1976 Volume 32 Issue 1 Pages 18
Published: June 15, 1976
Released on J-STAGE: July 01, 2010
JOURNAL FREE ACCESSDownload PDF (135K) -
Zenbei UCHIJIMA1976 Volume 32 Issue 1 Pages 19-21
Published: June 15, 1976
Released on J-STAGE: July 01, 2010
JOURNAL FREE ACCESSDownload PDF (335K) -
Yasumitsu KISHIDA, Shoichi SATO1976 Volume 32 Issue 1 Pages 23-26
Published: June 15, 1976
Released on J-STAGE: July 01, 2010
JOURNAL FREE ACCESSDownload PDF (2833K) -
Tetsuya Haseba1976 Volume 32 Issue 1 Pages 27-31
Published: June 15, 1976
Released on J-STAGE: July 01, 2010
JOURNAL FREE ACCESSDownload PDF (798K) -
Tadayuki Onuma1976 Volume 32 Issue 1 Pages 33-40
Published: June 15, 1976
Released on J-STAGE: July 01, 2010
JOURNAL FREE ACCESSDownload PDF (975K) -
Toyoki KOZAI1976 Volume 32 Issue 1 Pages 41-49
Published: June 15, 1976
Released on J-STAGE: July 01, 2010
JOURNAL FREE ACCESSDownload PDF (1189K)
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