The effect of the height of defoliation on two clones of perennial ryegrass

1972 ◽  
Vol 79 (3) ◽  
pp. 509-514 ◽  
Author(s):  
R. G. Simons ◽  
Alison Davies ◽  
Arthur Troughton
Keyword(s):  
Perennial Ryegrass ◽  
Significant Interaction ◽  
Leaf Tissue ◽  
Ground Level ◽  
Above Ground Level ◽  
The Difference ◽  
Cutting Height ◽  
Leaf Appearance

SUMMARYA significant interaction between genotype and cutting height was found in an experiment conducted to investigate regrowth from cutting heights of 2 cm and 5 cm above ground level in two contrasting genotypes with fast and slow rates of leaf appearance. There was, however, no evidence that production of herbage above the initial cutting height was increased by raising the height of cutting. This observation, and the difference between the genotypes, can be explained not only in terms of differences in the proportion of total above-ground parts harvested, but also in the scale of losses of leaf tissue by death.

The effect of cutting height and mulching on aerial tillering in two contrasting genotypes of perennial ryegrass

1974 ◽  
Vol 83 (2) ◽  
pp. 267-275 ◽  
Author(s):  
R. G. Simons ◽  
Alison Davies ◽  
A. Troughton
Keyword(s):  
Perennial Ryegrass ◽  
Ground Level ◽  
Above Ground Level ◽  
Selection For ◽  
Cutting Height

SUMMARYIn simulated swards of perennial ryegrass the production of aerial tillers, in which the growing point has been raised some distance above ground level by internode extension, depended upon the genotype and management. In both genotypes studied decreasing the height of defoliation from 10 to 2·5 cm nearly halved the incidence of aerial tillering, while the presence of a mulch of chopped straw at the base of the sward more than doubled the occurrence of these tillers. The effects of management are also discussed in relation to herbage production. The differences between the genotypes in the degree of aerial tillering suggests that selection for reduced aerial tillering may be of benefit.

Leaf tissue remaining after cutting and regrowth in perennial ryegrass

1974 ◽  
Vol 82 (1) ◽  
pp. 165-172 ◽  
Author(s):  
Alison Davies
Keyword(s):  
Growth Rate ◽  
Perennial Ryegrass ◽  
Plant Material ◽  
Shoot Growth ◽  
Leaf Tissue ◽  
Relative Growth ◽  
Appearance Rate ◽  
Leaf Appearance Rate ◽  
Leaf Appearance ◽  
Increased Activity

SUMMARYWhen one or two leaves were removed out of the three or sometimes four present on each tiller of five genotypes of perennial ryegrass grown in nutrient solution, it was found that the relative growth rate (RGR) was not much less than that of untreated plants. The removal of lower leaves had no effect on RGR. Removal of all leaf blades depressed RGR. It is suggested that the results obtained indicate that the plant has the capacity to compensate for loss of leaf tissue by increased activity in the remaining leaves. Leaf appearance rate and tiller production were found to be the attributes most sensitive to the defoliation treatments imposed, and the degree to which leaf appearance rates were affected by defoliation was found to be a good indicator of the regrowth capacity of the different genotypes. Evidence was obtained linking high regrowth potential with high relative increases in the proportion of plant material allocated to new shoot growth.

scholarly journals Velvetleaf regenerates and reproduces after cropping

2018 ◽  
Vol 71 ◽  
pp. 349
Author(s):  
Claire A. Dowsett ◽  
Trevor K. James
Keyword(s):  
Seed Set ◽  
Management Strategies ◽  
Late Summer ◽  
Ground Level ◽  
Abutilon Theophrasti ◽  
Viable Seed ◽  
Maize Silage ◽  
Above Ground Level ◽  
Regenerated Plants ◽  
Cutting Height

Velvetleaf (Abutilon theophrasti) was accidentally introduced into New Zealand in 2016 and intensive efforts are being implemented to mitigate the risk of its naturalisation. This study investigated the possibility of velvetleaf plants surviving in maize fields following silage harvest in late summer and early autumn. Velvetleaf plants were grown to maturity in a glasshouse during the summer of 2017—2018. They were left to seed and senesce naturally and, on 28 February 2018, five senesced plants were “harvested” at each height (0, 30, 50, 70 and 150 mm) with varying numbers of leaf nodes remaining (0, 0, 1, 2 and 3 pairs respectively). Velvetleaf was capable of regeneration 2—4 weeks after “harvest” from these leaf nodes. Forty percent regeneration occurred with 1 pair of nodes; 80% (2 pairs); and 100% (3 pairs). All regenerated plants subsequently produced mature seed pods with viable seed (95% germination) 6—10 weeks following “harvest”. Maize silage crops are normally cut ~100 mm above ground level. In this study, velvetleaf was able to regenerate and reproduce following simulated maize silage harvest at, below and above, normal cutting height. Growers are advised to continue management strategies for velvetleaf to prevent seed set following maize silage harvest and before sowing of the next crop or pasture.

Milk production and composition of dairy cows grazing two perennial ryegrass cultivars allocated in the morning and afternoon

2017 ◽  
Vol 57 (7) ◽  
pp. 1507 ◽  
Author(s):  
A. Chen ◽  
R. H. Bryant ◽  
G. R. Edwards
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Perennial Ryegrass ◽  
Nutritive Value ◽  
Morphological Characteristics ◽  
Ground Level ◽  
Water Soluble ◽  
Soluble Carbohydrates ◽  
Above Ground Level ◽  
Water Soluble Carbohydrates

The objective of the study was to evaluate the effect of perennial ryegrass cultivar and timing of herbage allocation on herbage nutritive value and milk production of mid-lactation dairy cows. An autumn grazing trial using 48 Friesian × Jersey spring-calving cows was conducted over 10 days. Twelve groups of four cows were allocated to three replicates of four treatments, namely, two perennial ryegrass cultivars (AberMagic or Prospect) offered either after milking in the morning (0830 hours) or afternoon (1630 hours). Cows were offered a daily herbage allowance of 30 kg DM/cow above ground level. There were no significant differences in sward structure and morphological characteristics between cultivars, except for Prospect having a lower average tiller mass (43.1 mg) than AberMagic (48.4 mg). The concentration of water-soluble carbohydrates (WSC) and organic matter digestibility in DM (DOMD) was greater in AberMagic (180 g/kg, 74.2%) than in Prospect (153 g/kg, 71.4%). Herbage DM percentage, WSC concentration and DOMD were lower in the morning than in the afternoon (18.8% vs 22.3% DM; 154 vs 179 g/kg WSC; 72.1% vs 73.5% DOMD). Herbage DM intake (12.0 kg/cow.day), milk yield (17.2 kg/cow.day) and milksolids yield (1.60 kg/cow.day) did not differ significantly among treatments. Cultivar choice and timing of allocation influenced herbage WSC concentration and digestibility, but did not alter milksolids production.

Seasonal dynamics of leaf extension and losses to senescence and herbivory in extensively managed sown ryegrass–white clover swards

1999 ◽  
Vol 132 (1) ◽  
pp. 77-89 ◽  
Author(s):  
C. A. MARRIOTT ◽  
G. T. BARTHRAM ◽  
G. R. BOLTON
Keyword(s):  
Perennial Ryegrass ◽  
White Clover ◽  
Plant Competition ◽  
Leaf Tissue ◽  
The Other ◽  
Grass Species ◽  
Flow Measurements ◽  
Sward Height ◽  
Leaf Appearance ◽  
Leaf Extension

Tissue flow measurements of leaf material in Lolium perenne (perennial ryegrass), Agrostis capillaris or Poa annua, and Trifolium repens (white clover) were made at three upland sites in Scotland (Hartwood, Sourhope and Fasque) in 1992/93 to determine if there were differences in seasonal growth, senescence and losses to herbivory between species in their response to more extensive sward management. The measurements were made monthly from May until October in established predominantly perennial ryegrass/white clover swards receiving three different treatments. One treatment received a conventional annual fertilizer application of 140 kg N/ha plus maintenance P and K and was grazed by sheep at a sward height of 4 cm (4F), whereas the other two treatments were unfertilized and grazed to maintain a sward height of 4 cm (4U) or 8 cm (8U).Significant sources of the variation in leaf appearance, increase in green lamina/petiole length (leaf extension), senescence and losses to herbivory were attributable to site, sward, species and date of measurement. The rate of leaf extension for all three measured species was less in 4U than 4F swards, and less in 4U than 8U swards. Leaf extension of L. perenne exceeded that of the other species, even in unfertilized swards, but rates of leaf appearance were less. There was some evidence in spring of a reduction in net growth as a consequence of removing fertilizer inputs and maintaining a sward height of 4 cm. Species differences in the losses of leaf tissue to herbivory were dependent on sward management. In the 4F treatment, leaf loss to herbivory from L. perenne tillers was greater than that from either A. capillaris, P. annua or T. repens in May, June and September. In the 4U treatment more leaf tissue was also lost from L. perenne than from T. repens. In contrast, there was no difference between grass species in losses to herbivory in either unfertilized sward. The responses of species to changes in fertilizer and grazing management were similar at three sites of differing fertility. The results are discussed in relation to plant competition and species dynamics in extensively managed swards.

scholarly journals PENGARUH TINGGI DAN JARAK WAKTU PEMOTONGAN RUMPUT GAJAH DWARF (pannisetum purpureum cv. Mott) TERHADAP PERTUMBUHAN VEGETATIF DAN PRODUKSI BAHAN KERING

ZOOTEC ◽  
2016 ◽  
Vol 37 (1) ◽  
pp. 117
Author(s):  
Santia . ◽  
Selvie D. Anis ◽  
Charles L Kaunang
Keyword(s):  
Factorial Design ◽  
Vegetative Growth ◽  
Ground Level ◽  
Elephant Grass ◽  
Factor B ◽  
Above Ground Level ◽  
Material Production ◽  
Two Factors ◽  
Cutting Height ◽  
Dwarf Elephant Grass

EFFECT OF HIGH AND DISTANCE OF CUTTING TIME OF DWARF ELEPHANT GRASS (pannisetum purpureum cv. Mott) ON VEGETATIVE GROWTH AND DRY MATERIAL PRODUCTION. This research aims to identify and obtain data about the effect of height and distance of cutting time on vegetative growth and dry material production of dwarf elephant grass (pannisetum purpureum cv. Mott). The treatments were applied into factorial design on the base of Group Random Design (GRD) which consists of two factors and three replications. Factor A were cutting height, a1 = 0 cm above the ground, a2= 5 cm above the ground, a3= 10 cm above the ground, a4= 15 cm above the ground. Factor B age of cutting, b1 = 20 days, and b2 = 30 days. The measured variables were including the number of tillers, ratio of leaf/stem and dry material production. Result of analysis of variance (ANOVA) showed that the number of tillers and dry ingredient of grass were affected very significantly (P < 0,01) by the interaction of high of cutting and the age of plant. However, the age of plant was giving a significantly different effect (P < 0,05) on the leaf/steam ratio. While the interaction high of cutting and age of plant did not significantly affect (P > 0,05) the leaf/steam ratio. Based on the research, it can be concluded that I order to ensure the continued production of P.purpureum cv.Mott measured in the number of tillers and dry ingredient, it should be cut at the age of 20 and 30 days with a cutting height of 15 cm above ground level. The highest value of leaf/steam ratio was obtained at the cutting age of 20 days.Keywords : P. purpureum cv. Mott, high and age of cutting, growth, dry material production

scholarly journals ANALISIS POTENSI CADANGAN KARBON UNTUK PENGELOLAAN HUTAN DI TAMAN WISATA ALAM DANAU BUYAN-DANAU TAMBLINGAN

2020 ◽  
Vol 14 (2) ◽  
pp. 154
Author(s):  
Bernadina Paulinda Maku ◽  
I Wayan Suarna ◽  
I Wayan Diara
Keyword(s):  
Forest Management ◽  
Carbon Stock ◽  
Management Strategy ◽  
Swot Analysis ◽  
Management Strategies ◽  
Ground Level ◽  
Carbon Stocks ◽  
Above Ground Level ◽  
Cultivation Technique ◽  
The Difference

Taman Wisata Alam (TWA) Danau Buyan-Danau Tamblingan one of the forest ecosystems that are rich in biodiversity.  The information about carbon stocks stored at the surface of the soil is very important to know in order to improvements can be made to the cultivation technique, plant type selection, and right forest management to maintain and increase carbon stocks. The study aimed: calculating and knowing the factors behind the difference carbon stocks above ground level, litter, and soil at Buyan Lake forest and Tamblingan Lake forest and formulating management strategy of TWA Danau Buyan-Danau Tamblingan for supports increased forest carbon stocks. Whereases the measurements carbon stock at medium, low and high density. To formulate management directives used the SWOT analysis. The result of this study is: carbon stocks in above ground level, litter and soil at Buyan Lake forest smaller than Tamblingan Lake forest, with the following details Buyan Lake forest, was: 613.03 ton/ha, 62.56 ton/ha and 125.443 ton/ha whereas Tamblingan Lake forest was: 768.93 ton/ha, 105.26 ton/ha and 360.711 ton/ha, factors causing differences in carbon stocks at Buyan Lake forest and Tamblingan Lake Forest  is the variety of plants that dominate and the human activity.  Management strategy of TWA is: provide assistance to the community to proposing Izin Pengusahaan Pariwisata Alam (IPPA), facilitated indigenous villages to gain recognition of customary forests and formulated awig-awig as local wisdom in management of TWA Danau Buyan-Danau Tamblingan. Keywords: Carbon stock; Forest management strategies; analysis SWOT; TWA Danau Buyan Danau Tamblingan.

Effects of cutting height on the growth of leaves and stolons in perennial ryegrass–white clover swards

1993 ◽  
Vol 121 (1) ◽  
pp. 39-46 ◽  
Author(s):  
D. Wilman ◽  
G. H. p. Acuña
Keyword(s):  
Perennial Ryegrass ◽  
White Clover ◽  
Ground Level ◽  
Extension Rate ◽  
Petiole Length ◽  
Leaf Emergence ◽  
Length Width ◽  
Cutting Height ◽  
Field Plots ◽  
Leaf Extension

SUMMARYAll combinations of five cutting heights (2, 4, 6, 8 and 10 cm) were compared, for 3 years (1986–88), on field plots sown with a mixture of perennial ryegrass (Lolium perenne L.) and white clover (Trifolium repens L.) in Wales. The plots were cut at 4-week intervals from April to October each year.A reduction in cutting height reduced the length, width and weight of clover leaflets, petiole length, stolon diameter, the length of stolon internodes and the height of stolons above ground level, but increased the length of clover stolon/m2, the number of stolon nodes/m2 and the proportion of stolon nodes which produced branches. The latter factors out-weighed the former, leading to the inverse relationship between cutting height and the proportion of clover in the sward previously reported (Acuñia & Wilman 1993).A reduction in cutting height reduced the following attributes of ryegrass: the height of the shoot apex, the length and width of leaf blades, sheath length, leaf extension rate, the death rate of leaves and the net gain in blade length.Cutting height had little effect on either the thickness of clover leaflets or the rates of leaf emergence in clover and ryegrass.

scholarly journals SKIRTING VERSUS UNSKIRTING CITRUS TREES FOR FROST CONTROL

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1116f-1116
Author(s):  
Anastacio P. Naranjo ◽  
Robert J. McNeil
Keyword(s):  
Minimum Temperature ◽  
Ground Level ◽  
Daily Minimum Temperature ◽  
Average Increase ◽  
Cold Temperatures ◽  
Above Ground Level ◽  
Daily Minimum ◽  
The Difference ◽  
Citrus Trees

The purpose of this experiment was to measure the difference in temperatures influenced by skirted and unskirted cirrus trees under cold temperatures. Sixty citrus trees (oranges and lemons) planted on a hillside were skirted at 18 inches above ground level for this experiment. The experiment was conducted over 96 days, in which daily minimum temperature readings were taken. In addition to the thermometers, four thermographs were used to record constant temperate and duration of frosty nights.In 79 of the 96 days of the experiment, the skirted treatment showed an increase in the temperature compared with the unskirted treatment at an average increase of 0.25°F. Statistical differences between treatments ranging from 0.5°F to 0.7°F were found for three different days at temperatures in the 40's. No statistical differences between treatments were found at temperatures in the 30's. The thermograph readings showed no differences in the duration of cold temperatures between skirted and unskirted treatments.

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