摘要:

The effect of four grasses, and four methods of utilizing the herbage, on the root weight, the proportion of organic matter in the soil and the water‐stability of the soil aggregates was measured over a period of three years. The grass species in the sward had a greater effect upon the measurements than had the methods of management. Of the grass species,Lolium perenneproduced the greatest root weight and highest percentage of organic matter in the soi

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00204.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

It is commonly said that‘resistance to change’ is a basic factor preventing farmers from adopting new techniques, but such a statement depends on an external judgement as to the suitability of the technique studied for the farmer. In a recent survey, farmers were asked to give their reasons for not taking up recommended techniques for grassland farming, and these reasons are examined. In some cases it is clear that the farmer has no good reason for not using the technique except that he dislikes it, and differences between techniques in this respect are discus

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00205.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00206.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

The characters in 25 varieties of Rhodes grass introduced from Africa have been studied with a view to improving on Australian Commercial. Only the diploid Katambora and a tetraploid variety from Kenya appeared to possess a higher yield potential than Commercial. Sixty per cent of the varieties are tetraploid, the rest diploid. A degree of association occurred between the level of ploidy and some Rhodes grass characters.Although Rhodes grass appears to be xenogamous, all the critical evidence points to an apodictic form of reproduction. Viable caryopses were extracted from harvested “seed” and the percentage of florets setting caryopses was low. Rhodes grass caryopses germinate fairly well and have a higher resistance than usual to irradiation by gamma r

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00207.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

Calves born in late September to early October in 1956, 1957 and 1958 were reared at pasture. They were fed milk substitute, supplemented in some cases with concentrate feeding‐stuffs.The losses due to outdoor rearing were low, and calves made satisfactory gains in weight. By rearing at pasture, a considerable saving was effected in the weight of concentrates and hay consumed, while no marked response to the feeding of these supplements before weaning was found. Animals born in the autumn of 1957 and reared on this system reached 10 cwt. in less than 24 month

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00208.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

Three leafy grass varieties, S215 meadow fescue, S37 cocksfoot and S51 timothy. were subjected to four dril spacings of 6, 15, 24 and 36 in. under two levels of nitrogen application. Over three harvest years, meadow fescue gave better seed yields with 6‐ and 15‐in, drill spacings. Cocksfoot gave very similar yields from 1.5, 24‐ and 36‐in, drills but a signincantly reduced yield from 6‐in, spaced drills. Timothy produced significantly higher yields at the 24 in spacing.The three varieties showed a significant response to nitrogen application.Aphids seriously affected the vegetative growth of meadow fescue and timothy at the wider spacings, but the 6‐in. drills m boths species remained relatively free of aphid attack, as also did the cock

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00209.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

To estimate the proportion of the total dry matter of a herbage sample which arises either from dead or from green herbage, four methods have been compared. One of the methods, the pigmentation method, is described.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00210.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

During the years 1957 to 1959 a number of trials carried out at various centres throughout the country showed that the yield of Irish pastures could be greatly increased through the application of fertilizers. Phosphorus increased both yield and the protein content of herbage. The increase in yield was a linear function of the initial P status of the herbage. For the series as a whole, phosphorus increased the yield by approximately 20%, potassium by 7% and phosphorus and nitrogen by 45%. The national and sociological implications of these results are discussed.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00211.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00212.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

The effect of nitrogenous fertilizer on a white clover sward was studied to obtain information to be used in the evaluation of white clover in grassland. There was no evidence of a yield response. The weight of nodules was depressed by the addition of fertilizer.Where management is adjusted to maintain white clover in swards receiving large quantities of nitrogenous fertilizer the clover may use part of this fertilizer at the expense of symbiotic fixation.The relation of the results obtained to the assessment of the benefit derived from white clover in mixed swards is briefly discussed.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00213.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY