ISSN:0022-5142    

DOI:10.1002/jsfa.2740150301

出版商:John Wiley&Sons, Ltd    

年代:1964

数据来源: WILEY

摘要:

AbstractDazomet, D‐D, metham‐sodium, and methyl isothiocyanate were applied to seven glasshouse and four field soils; methyl bromide was applied to two of the field soils. In both the glasshouse and field, all sterilants retarded nitrification of ammonium‐N, and in some soils they increased the mineralisation of soil organic‐N; dazomet had most effect and metham‐sodium least. In field soils, methyl bromide increased the mineralisation of soil organic‐N more than the other

ISSN:0022-5142    

DOI:10.1002/jsfa.2740150302

出版商:John Wiley&Sons, Ltd    

年代:1964

数据来源: WILEY

摘要:

AbstractDuring the development of apples the most striking difference in mineral uptake is that between the potassium and calcium patterns. Potassium uptake continues throughout growth, being an essential constituent of the buffer system in the vacuole. Calcium uptake falls off appreciably after the initial period of cell division. It is suggested that the initial supply or availability of calcium in the tree may be of importance in determining the later development of physiological disorders.The mineral content of apples is not appreciably affected by normal variations in date of picking, although there may be small changes. The most obvious drift is a consistent late uptake of sodium.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740150303

出版商:John Wiley&Sons, Ltd    

年代:1964

数据来源: WILEY

摘要:

AbstractA study is being made of changes in wheat stored up to 10–12 years under conditions such as might be used for long‐term commercial storage. Changes in as many characteristics of the grain as possible are measured. The effects of low temperature and low oxygen concentration, singly and together, on the changes occurring during storage are being studied.The present paper describes the methods used to detect the small changes which occurred in grain stored under the above conditions for 4 ye

ISSN:0022-5142    

DOI:10.1002/jsfa.2740150304

出版商:John Wiley&Sons, Ltd    

年代:1964

数据来源: WILEY

摘要:

AbstractHumus substances formed during the decomposition of the root material of yellow lupin and white melilot in sand were isolated and examined and compared with corresponding fractions from a garden soil. Depending on their origin, the humus substances differed in their content of carbohydrate, protein, lignin‐like compounds, and also methoxyl groups. Humic acid fractions from lupin and melilot material seemed less far removed from plant material than that from garden soil. Fulvic acid fractions in comparison with humic acid fractions contained more carbohydrate, less nitrogen and no lignin‐like material. Phenolic acids and aldehydes related to lignin were found in the sand‐root mixtures in greatest amount at 20 and 30 days' incubation. Melilotic acid, a product of coumarin metabolism, was found in melilot root material only during the first 10 days of incubation.The composition of the combined amino‐acids in lupin and melilot humic acids fractions was similar to, but differed somewhat from, that of garden soil humic acid. The fulvic acid fractions contained relatively more glucosamine than the humic acid fractions. The presence of glucosamine, αϵ‐diaminopimelic acid and α‐aminoadipic acid in the fractions indicated that their nitrogen was partly of mi

ISSN:0022-5142    

DOI:10.1002/jsfa.2740150305

出版商:John Wiley&Sons, Ltd    

年代:1964

数据来源: WILEY

摘要:

AbstractThe atmospheric concentration of dimefox in hop gardens in the immediate vicinity of the filling tank was determined while dilution of the concentrate was being carried out, and during the application of the diluted wash to the soil.An agricultural worker in the immediate vicinity of the tank might inhale on an average 0.1 mg. of dimefox in an 8‐h. day and, during application of the diluted wash to the soil in a hop garden, an average of 1.2 mg. of dimefox per day. No cases of poisoning due to the inhalation hazard have been reported in the United Kingdom, presumably because application of dimefox to hops is limited to short periods only during the summe

ISSN:0022-5142    

DOI:10.1002/jsfa.2740150306

出版商:John Wiley&Sons, Ltd    

年代:1964

数据来源: WILEY

摘要:

AbstractEquilibrium mixtures containing water, synthetic hydroxyapatite and phosphate‐free saturated single‐base clays were prepared to determine the solubility of phosphate in absence and in presence of some sodium and calcium salts. The solubility is affected by the nature of exchangeable cations and increases in the series Ca

ISSN:0022-5142    

DOI:10.1002/jsfa.2740150307

出版商:John Wiley&Sons, Ltd    

年代:1964

数据来源: WILEY

摘要:

AbstractA method is described for the fractionation of SO2‐binding compounds on a column of Dowex‐1 (bisulphite) and their identification by paper chromatography. In normal cider these compounds originate from the fruit, or from degradation of fruit constituents, and from yeast fermentation; they consist of sugars, acetaldehyde, xylosone, galacturonic, pyruvic and α‐ketoglutaric acids. The high SO2‐binding power of juice and cider from damaged fruit is due in part to carbonyl metabolic products of acetic bacteria, including 5‐ketofructose, 2‐ketogluconic and 2,5‐diketo

ISSN:0022-5142    

DOI:10.1002/jsfa.2740150308

出版商:John Wiley&Sons, Ltd    

年代:1964

数据来源: WILEY

摘要:

AbstractThe hygienic and technical problems which arise in production of wine from grapes treated with zineb have been examined in experiments carried out under conventional conditions and in small‐scale wine‐making processes.Yeast can develop and ferment even in the presence of relatively large amounts of zineb (up to 500 p.p.m.), the fungicide itself causing some increase in the rate of fermentation.Yeast appears to absorb zineb and to utilise it (as well as other forms of sulphur commonly used to treat wines) and to produce hydrogen sulphide and mercaptans, the fermentation balance being substantially unmodified.In practical conditions the treatment with zineb spray does not appear to influence the composition of natural yeast flora of grapes.The amount of residues recovered on treated grapes is very low (less than I p.p.m.). After the grapes have been crushed these residues are found in the must and at the end of fermentation the main part is collected in the lees after decantation of the wine, and they are recovered unmodified.Hydrogen sulphide, carbon disulphide and mercaptans are produced proportionally to the dose of zineb present in the must. The real influence of the traces of this fungicide on the composition and on the flavour of wine appears to be negligi

ISSN:0022-5142    

DOI:10.1002/jsfa.2740150309

出版商:John Wiley&Sons, Ltd    

年代:1964

数据来源: WILEY

摘要:

AbstractThe dry‐matter content of 30 silages has been determined by oven drying and by distillation with toluene, values obtained by the latter method being corrected to allow for volatile materials present in the aqueous distillate.The toluene distillation method gave values up to 22.1% higher than the oven‐drying method, the largest differences occurring with silages of low dry matter and high volatile fatty acid concentration. Even when volatile fatty acid content was low, the toluene distillation results were some 12% higher, due to the appreciable volatility of lactic acid under the conditions of the oven‐drying method used. The implications of these results on intake and digestibility studies with ruminant animals are disc

ISSN:0022-5142    

DOI:10.1002/jsfa.2740150310

出版商:John Wiley&Sons, Ltd    

年代:1964

数据来源: WILEY