摘要:

ABSTRACTThe dates of their first appearance and the dates of flowering were recorded monthly over three years from time of sowing for all tillers produced by S215 meadow fescue plants growing in simulated sward conditions in large concrete pots outdoors. The results are expressed and discussed in terms of the percentage contribution of inflorescences by tillers in relation to their chronological and ontogenetic age. The latter appeared the more important. The major contribution of inflorescences was made by primary tillers in the first harvest year, by secondary and tertiary tillers in the second year and by tertiary and quaternary tillers in the third year. The chronological age at which tillers could flower ranged from 3 to 33 mouths.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1970.tb01094.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

摘要:

ABSTRACTFour experiments are described in which various defoliation methods and frequencies were imposed on grass/white‐clover swards. Clover was not reduced in any of these hy increasing the length of growth period or hy cutting at a late stage of growth, but intensive sheep grazing reduced clover compared nitb cutting and taking a silage cut in a grazing sequence improved clover yield.These results do not support the contention that cutting a mixed sward for hay or silage suppresses clover because of competition for light: with a ‘big white’ type of clover infrequent defoliation may cause no more shading than frequent. Alternatively, any additional shading may be compensated for by an increase in clover growth, stimulated hy the longer growth period.It is suggested that, in practice, competition for nutrients and moisture also contrihute towards clover suppression when swards are cut for hay or s

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1970.tb01095.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

摘要:

ABSTRACTThe application of an electronic pasture probe to the measurement of rape is described. Measurements taken over two years demonstrated that good relationships could be established between probe readings and parameters of crop yield. Crop height, spatial distribution of crop profile, crop density and percentage DM were found to he significant factors in obtaining meaningful results.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1970.tb01096.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

摘要:

ABSTRACTPerennial ryegrass was conserved by ensiling, or by dehydration, grinding and pelleting. the two resultant feeds were givenad lib. to wether sheep, either separately or in different proportions. Pellets were consumed in greater quantities than the silage, but were lower in digestibility. There was a rectilinear relationship between the percentage of pellets in the ration consumed and organic‐matter digestibility, but a curvilinear relationship between the percentage of pellets and organic‐matter intake. Silage intake was little affected by the feeding of pellets until more than 40% of the ration consisted of pellets. The increase in total intake with an increase in pellets above 60% was small, with the result that intake of digestible organic matter was highest when 65% pellets was fed. the results suggest that dried‐grass pellets may be a useful supplement for silage ra

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1970.tb01097.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

摘要:

ABSTRACTWorld literature relating to grass production on peat soUs is reviewed. If initial nutrient deficiencies are adequately corrected the grass potential is high. DM yields of 6500 kg/ha are attainable with moderate fertilizing. A high level of output must he maintained to justify the cost of reclamation. Light applications of P and K at regular intervals, coupled with heavy stocking or frequent defoliation, prevent pasture deterioration.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1970.tb01098.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

摘要:

ABSTRACTTwo experiments are described in which ground harley meal was added to freshly‐cut grass hefore ensiling it in small air‐tight metal containers and polythene containers. The mean DM loss from the air‐tight metal containers was 1 % and from the polythene containers 18.8%. The silages were all of satisfactory fermentation quality, as assessed hy pH, voladle acids, lactic‐acid and Tolatile‐hase content. The addition of the harley meal significantly improved the nutritive content of the ensiled material, and the resulting silage in the air‐tight metal containers. Sheep were used to measure the voluntary intakes of the silages conserved in the polythene

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1970.tb01099.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

摘要:

ABSTRACTA comparison was made of the effects of grazing with cattie and sheep separateiy hy two methods, continuous and rotationai on two forage mixtures. The two mixtures were timothy (Phleum pratenseL.) with iadino white ciover (Trifolium repensL.); and brome grass (Bromus inermisLeyss) witii aifalfa (Medicago sativaL.). The rotationai system of grazing created different effects on sward composition from those caused hy the continuous grazing system. The legumes survived hetter under rotational than continuous grazing. Sheep, under both grazing systems, grazed more severeiy than cattie; they defoliated the ieaf portion of the plants and ieft more stem standing than did the cattle. Protein of the sward increased with the leaf portion, butin vitrodigestibility was not altered as leaf to stem ratios changed. Although the gross effects of sheep and cattle were similar, there were differences in detail in the effect on these swards.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1970.tb01100.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

摘要:

ABSTRACTThis paper describes the rate of growth of Italian ryegrass in the spring, measured by recording DM yield at weekly intervals up to 10 weeks. There were 3 levels of applied N: 25, 75 aud 125 lhJac (28, S4 and 140 kgJha). Rate of growth declined after the sixth week at all 3 levels of N. Grass receiving 25 Ib N produced 5000 Ib DMJac (5600 kgJha) in 10 weeks, that receiving 75 lb N 6800 Ib (7700 kgJha) and that receiving 125 lb N 7100 lb (8000 kgJha). The DM content of herbage fell after the first week and subsequently increased steadily up to 10 weeks; the fall was least marked and the rate of increase most rapid at tbe lowest level of N.In vitrodigestibility (measured in one year only) was much affected by stage of growth and little affected by level of N.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1970.tb01101.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

摘要:

ABSTRACTHays made, mainly in May, from pure swards of perennial ryegrass, timothy and meadow fescue were fed to 8‐month old steers in 1963 and to yearling steers in 1964. High‐quality hay was obtained, but no significant differences in growth rate were observed between calves fed on hays from the 3 species. In 1963, barley (1.5 kg DM/ head per day) was fed, in addition to the hays, to half the animals and resulted in a significant increase in live weight gain.The productivity, in terms of liveweight gain/ unit area, of each species when managed for hay and‘zero grazing', or hay and grazing, was calculated. On this calculation perennial ryegrass was the most productive sp

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1970.tb01102.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

摘要:

ABSTRACTStudies were made in S.W. Scotland of the effect of winter grazing (October to March) by sheep on subsequent spring and early summer pasture production from a sward in its first harvest year and from a permanent pasture. Averaged over the two swards, DM yields in April, May and June were reduced by 38%, 8% and 5%, respectively, as a result of various times and frequencies of grazing, compared with no grazing. Reductions were greatest after grazings in the January to March period, especially grazings involving the month of March. In a trial in which fertilizer N was used to compensate for March grazing, 50 kg NJha raised DM yields in April to the level of those from no grazing, while only 15 kg NJha were needed to raise June yields to parity. Controlled winter grazing of sheep and the use of fertilizer N to restore production losses after early spring grazing are justified.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1970.tb01103.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY