Yoshida, 'The critical level of N P K in rice as determined by relative tillering rate', Paper presented at the IRRI Saturday Seminar, January 27, 1968. 11 p.

The purpose of this paper is to present some contributions to physiological coprology. A sieve analysis system for the fractionation of faeces is proposed and results obtained by this system presented. Ash and crude protein were determined from the fractions. The other part of the paper deals with the extraction of faeces first with boiling 80 % ethanol and subsequently with boiling absolute ethanol. Crude protein and, in some cases, also ash were determined from the extracts. The use of such extractions as a preliminary step towards a more detailed examination of certain substances in faeces is proposed.

Deformation mechanism of the elastic region which follows the nonlinear frictional region in shearing of plain-weave fabrics is analyzed, and the elastic shear modulus is determined in terms of the mechanical properties of the yarn and the geometrical parameters of the fabric. The mechanical behavior of the three-dimensional unit cell of plain-weave fabrics is studied, based on a simple model of yarn in relative slipping of yarns at the intersection of the fabric. The effect of tension being applied in shear tests is also included in the analysis. The elastic shear modulus determined by the proposed mechanism of deformation is found to agree well with experimental results.

Glycerophosphatides were isolated from ox brain gray matter by column chromatography. The fatty acid compositions of ethanolamine glycerophosphatides (EGP), serine glycerophosphatides (SGP), and choline glycerophosphatides (CGP) were determined by gas-liquid chromatography. The positional distribution of fatty acids in these glycerophosphatides were determined by phospholipase A hydrolysis (Habu habu venom). C20 and C22 polyunsaturated acids were confined almost exclusively to the 2-position of these lipids, where they comprised the majority of 2-substituents in EGP and SGP (oleic acid predominated in this position in CGP). In the 1-position, palmitoyl was the major substituent in CGP, stearoyl in SGP, and stearoyl or the corresponding alk-1-enyl group in EGP.

Fatty acid composition and oil content of seeds were determined by gas-liquid chromatography and nuclear magnetic resonance spectrometry, respectively, for parents and reciprocal crosses of soybeans. It was found that oil content and the fatty acids (oleic, linoleic, and linolenic) of the oil are determined primarily by the genotype of the maternal parent. The pollen parent had little influence on oleic and linoleic acids of seed oil, but in certain crosses the genotype of the male parent influenced the linolenic acid fraction. In these crosses linolenic acid was intermediate between the two parents. The results indicate that selection for oil content or for unsaturated fatty acids based on individual F₂ seed analysis would be ineffective in soybeans, with the possible exception of linolenic acid.

Linear extensibility is a variable being used by the Soil Survey Laboratories to characterize the expansion-contraction properties of soil. It is calculated from bulk density data and must be corrected for coarse fragments when they are present in the field. A pair of nomographs is presented to facilitate these calculations. The volume percent of fine-earth fabric (F) is determined from the first nomograph and transposed to the second nomograph where it serves to correct the extensibility as determined on the fine-earth fabric. The value F may also be used to facilitate conversion of other laboratory data to a field basis where coarse fragments are present.

The hepatic reserves of vitamin A were determined in three groups of beef cows and calves grazing pastures throughout two consecutive years. Group differences in the hepatic reserves of vitamin A in calves were probably an effect of age.

A theoretical analysis of clear sky radiant emittance in the 600 to 11300 cm-1 waveband showed that this energy flux should be fairly constant over a diurnal period, contrary to some recently reported measurements. New experiments revealed this to be true and indicated that the source of error in the earlier work was due to equipment malfunction. The errors in radiometrically determined surface temperatures caused by neglecting the small variations which do occur were determined to be less than the limits of accuracy of present-day infrared thermometers in many applications of infrared thermometry to soil and plant research. A nomogram predicted the temperature error to be expected from neglect of clear sky radiant emittance variations for surfaces with temperatures between O and 60 C and infrared emittances between 1.00 and 0.90.

Any sheep husbandry programme aiming at an improvement of lamb production must rely on known information about ewe and ram reproductive physiology. Of primary importance in the case of the ewe is a knowledge of the breeding season and in particular its onset, since, as this has been demonstrated to vary between breeds and regions, it must be determined for each particular case. The Corriedale breed is known to have its onset earlier than Romneys and later than Merinos and because of its dual purpose nature is particularly suitable for early lamb production, besides that, Canterbury province because of its high density of Corriedale sheep, can play a major role on the above mentioned early lamb production. Information about Corriedale's onset of the breeding season is scarce throughout the world in comparison with the large amount of data about the Merino and other breeds. In order to get an earlier and concentrated lambing, synchronisation methods have been devised, but these necessitate an accurate knowledge of the breeding season and in particular of its onset. This applies, especially for the case by synchronisation by the ram introduction technique, which at the present is the only practicable method for general term us. The onset of the breeding season for Corriedale in Canterbury has not been precisely determined: the present experiment was planned to provide information on this aspect of the reproductive process. Several methods can be utilized for determination of the breeding season of ewes. The possibility of obtaining information from a number of flocks belonging to different properties and the large number of animals involved decided the utilization of the examination of reproductive organs of slaughtered ewes technique. By means of this method information of the presentation of heats and thus approximate date of ovulation cannot be obtained: on the other hand it permits the consideration of a large number of animals. Date of ovulation can be determined with a relative precision from examination of the ovaries. The presence of the ram can alter the onset of the breeding season (see Chapter II, page 7) thus for a determination of the natural onset all ewes to be slaughtered were kept away from rams. It was intended to continue the observations throughout the breeding season, but, due to problems in the availability of animals, this was not done and only the onset was able to be determined.