Bulletin of Ishikawa Agricultural College

Studies on Soil Improvement by Rice Hulls (II) : Soil Density and Hydraulic Conductivity of the Saturated Soil in Relation to the Application Quantity of Rice Hulls

Kunihiko KITAMURA

Article type: Article
1977 Volume 7 Pages 27-31
Published: 1977
Released on J-STAGE: April 02, 2018

DOIhttps://doi.org/10.20715/bulliac.7.0_27

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The soil structure of high density is well known to prevent the normal growth of plants. In this experriment the effect of mixing soil with rice hulls on the density of heavy soil was observed by making a static loading test and a hydraulic conductivity test. The results obtained were as follows: 1. The strain in the soil subsidence increased with an increased mixing ratio of rice hulls to the soil. 2. In the static loading test, soil compaction was most marked in the surface layer (0-5cm), and its trend was weakened as the soil layer became deeper. 3. Apparent specific gravity of the soil in the surface layer decreased in parallel with an increased mixing ratio of rice hulls. This showed that an addition of rice hulls to the soil was very effective in preventing the soil from its becoming compact. 4. Water permeability of the saturated soil in its surface layer got better as the l with rice amountof rice hulls mixed increased. This suggested that mixing soil with rice hulls would improve the soil structure.

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Viscosity of Rumen Fluid of Ruminants (II) : Effect of Form of Corn in the Ration

Tomoya USAGAWA, Eizo TSUDA

Article type: Article
1977 Volume 7 Pages 37-41
Published: 1977
Released on J-STAGE: April 02, 2018

DOIhttps://doi.org/10.20715/bulliac.7.0_37

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Changes in rumen fluid properties of sheep, fed ration containing cracked, ground, or rolled corn, were studied. Periodical changes in viscosity and pH value of the rumen fluid from sheep fed cracked corn ration were smaller than those from other sheep. At every sampling time, soluble carbohydrate level (determined as glucose) of the rumen fluid was higher when the sheep were fed cracked corn ration, and lower when fed ground corn ration, than when they were fed rolled corn ration. These results indicated that cracked corn remained in the rumen for a longer time as it was dissolved more slowly. As compared with the sheep fed hay only, those fed a ration containing any of the three forms of corn had approximately twice as many Spirotrichia protozoa in the rumen, and the number of Holotrichia protozoa was decreased markedly to nearly none.

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Effects of a High Level of Dietary Bone Meal on Several Characters of Shell Eggs

Makoto NAKAMURA, Keisuke KATOH

Article type: Article
1977 Volume 7 Pages 42-45
Published: 1977
Released on J-STAGE: April 02, 2018

DOIhttps://doi.org/10.20715/bulliac.7.0_42

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Eighty laying hens of sixteen months old were fed ad libitum with commercial layer diet containing 3.4% calcium and 1.56% phosphorus, with or without 21% surpplemental bone meal. The bone-meal-supplemented diet contained 7.09% calcium and 2.49% phosphorus. When compared with the basal-diet group, the bone-meal-diet group consumed more diet, but their energy intake was 19.5% smaller, resulting in significantly larger body weight loss; however, the laying performances of the two groups were not significantly different. The values of shell breaking strength, egg weight, egg width, egg shape index (width/length), and shell thickness were significantly larger in the basal diet group. Egg length was slightly larger in the bone-meal-diet group. Significant correlation was observed between shell breaking strength and shell thickness in both groups. There was no correlation between shell breaking strength and egg weight or between shell breaking strength and egg length or width.

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