摘要:

The effects of management on the production of winter grass wen studied of 47 site England and Wales from 1954 to 1958.Cocksfoot swards provided better grazing during December and January than perennial ryegrass. The best treatment for winter‐grass production from cockfoot swards was to rest from mid‐August, giving un application of 52 lb of nitrogen per acre at this time.Perennial ryegrass produced relatively high yields if rested from early September, but the herbage should be grazed before the end of November because of the risk of it rotting.Cocksfoot herbage in normal swards lost more weight from December to January than cocksfoot sown in wide drills.Local Factors, such as aspect, altitude and sward vigour, were generally more important than latitude in determining level of yield in December. but there were greater lovsess of dry matter from December to January in the north than in the so

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00233.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

Attention is drawn to the increase of the unpalatable and unproductive grass,Nardus stricia, on hill grazings. This increase is considered to be related to a decline in soil fertility, which is being hastened by present‐day management.An experiment to measure the production of a typicalNardus‐dominated sward at 1700 feet O.D. on the northern Pennies is described. The results sliow that there was no increase in dry matter during the growing season. There was however an increase in some mineral elements. A manurial treatment showed poor response, but when the sward was cut and the herbage removed in spring, subsequent manuring gave spectacular yie

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00234.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

Although it has been widely established that increased crop yields follow leys sown on arable land, the relative importance of the many causative factors which may be involved is obseure. An attempt has been made to evaluate the influence of 3‐ to 4‐year leys on the organic matter in an arable soil and to distinguish also the relative importance of the resultant change in moisture‐holding capacity, crumb stability and the nitrogen status of the soil as factors in the yield of winter wheat.An increase of about 4 tons per acre in total soil organic matter was recorded after 3 years under grazed swards. Moisture‐holding capacity increased by an amount equivalent to the evapo‐trans‐piration loss from a full plant cover on one summer day. An increase in crumb stability was largely confined to the top inch of soil, which is effectively buried when leys are ploughed.The influence of variation in soil nitrogen status and in crumb stability on the yield of winter wheat after leys was examined by multiple regression analysis of data obtained over a number of yean from field experiments. After allowing for the effect of variation in the nitrogen status of the soil, the influence of variation in crumb stability was insignificant Conversely variation in the nitrogen status of soils, sampled under leys before ploughing, was closely correlated (r =+0.93***) with

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00235.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.tb00236.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

The design is given of a wagon box that has 2 compartments: one serves as a self‐feeding bunk for 8 cows, the other tan he emptied into a stationary bunk to feed a like number of cows. Facilities for automatic sampling of forage from 2 fields and procedures for efficient harvesting and weighing arc describe

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00237.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

With modern machinery and modem techniques of grass production, mechanical‐or zero‐grazing offers a means of utilizing the crop to perfection. Whether this results in enhanced profits depends largely upon the farm and the specific circumstances. It may, it may not. What is evident is that the health of the cows is not affected by an unnatural manner of summer feeding; the sward, per se, may be improved by the regular and uniform defoliation; and under conditions of intensive production and the vital need to use profitably every blade of grass, as for instance on small, highly‐rented farms, the practice of zero‐grazing merits the most careful consideration. It cannot lightly be dismissed as merely a

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00238.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

A series of experiments was laid down in 1957 on different upland vegetation types in Scotland to provide a basis of critical information on the performance of 18 herbage varieties. The present paper deals with results on areas dominated originally byMoliniaandNardusat Sourhope farm, Roxburghshire. Data obtained between 1957 and 1954 are discussal in relation to sward development, competition with remnants of native herbage and seasonal productivity.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00239.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

Five cool‐season turf grass mixtures were grown under two culling heights and two nitrogen levels. Turfs were sampled for population density each spring and fall for a three‐year period, using the core‐sampling method. Densities of all declined steadily throughout the period in all treatments. With one exception, populations of any one species were at the same low level at the end of the study, regardless of the trea

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00240.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

The effects of variety, date of cutting flush growth and level of nitrogenous manuring on the crude‐protein content of Italian ryegrass were studied on plots cut five times in 1958.Raising the level of nitrogenous fertilizer from 174 lb. to 348 1b. N/acre reduced the percentage of dry matter from 0·5 to 2·0 and increased the percentage of crude protein in the dry matter from 0·9 to 5·1, with net increases in crude protein/fresh material of from 0·06 to 0·57%. Varieties showed consistent differences, the three Westcrwolth types, New Zealand H.I and New Zealand Italian being higher in percentage crude protein than Ayrshire, Irish, Danish and S22.Culling the flush growth earlier resulted in an increased percentage of crude protein for that particular cut, but no overall increase in mean crude‐protein p

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1961.tb00241.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.tb00242.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY