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Articles 211 - 240 of 59184

Full-Text Articles in Physical Sciences and Mathematics

Productivity Of A Natural Grass Stand At Different Cutting Frequency, Jan Tomasik, Ondrei Tomka Jul 2026

Productivity Of A Natural Grass Stand At Different Cutting Frequency, Jan Tomasik, Ondrei Tomka

IGC Proceedings (1977-2023)

At adequate moisture supply from the soil, the productive potential of a natural grass stand can be considerably increased within a very short time even in the warmer regions of Czechoslovakia. Under the given ecological conditions, under three•cut use dry matter yields were 7 .2 t/ha when fertilized with 50 kg N/ha, and I 1.7 t/ha after application of 400 kg N/ha; that is a 2. l-3.5fold increase. The crude protein yield increased 2. If old under two-cut use and 5fold under six-cut use, as compared to the unfertil­ized control plot. The increase in cutting frequency decreased • the dry …

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Yield And Nutritive Value Of Forage Plants As Influenced By Stage Of Plant Development At Harvest, Khindrek Older, Ants Linnutaya, Yulo Oll Jul 2026

Yield And Nutritive Value Of Forage Plants As Influenced By Stage Of Plant Development At Harvest, Khindrek Older, Ants Linnutaya, Yulo Oll

IGC Proceedings (1977-2023)

Field experiments were conducted for the pur­pose of studying yield formation in six single­crop sown grass species and two clover/grass mixtures, as well as the. chemical composition and in vitro digestibility of the forage as in­fluenced by the stage of plant development at the time of harvest. Highest dry matter yields were obtained from two-cut use with harvesting in flower. Highest digestible dry matter levels were obtained from three-cut use in the stage of shooting. Highest protein levels were recorded in the context of four-cut use in the heading stage. Digestible nutrients were high in the tillering and shoot­ing stages. …

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Use Of Legume/ Grass Pastures In The Central District Of The Ussr Forest Zone, Anelya Kutuzova, Kira Privalova Jul 2026

Use Of Legume/ Grass Pastures In The Central District Of The Ussr Forest Zone, Anelya Kutuzova, Kira Privalova

IGC Proceedings (1977-2023)

Permissible grazing frequency was elucidated by comparing forage plant mixtures for their response to different regimes of use, with reference being made to variation in yields and in the percentage of sown legume com­ponents in the stand. In the absence of nitro­gen-fertilized grass stands in the pasture, a mixture with white clover is recommended for five uses. For four uses it is more suitable to take mixtures with red clover or alsike clover, or with white clover as well, provided the availability of grass stands for early pasture use. Only three uses per season are permissible of alfalfa/ grass mixtures, …

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Continuous Supply Of Fresh Forage To Factory-Like Dairy Farms As Demonstrated By The Example Of Eibau, Horst Neubert, Christiane Ruppert Jul 2026

Continuous Supply Of Fresh Forage To Factory-Like Dairy Farms As Demonstrated By The Example Of Eibau, Horst Neubert, Christiane Ruppert

IGC Proceedings (1977-2023)

Investigations conducted in a factory-like dairy farm and in a crop production cooperative farm specialized in forage have proved that the use of fresh forage is very efficient from the economic point of view and that under the conditions of crop production along industrial lines fresh forage can be supplied according to demand and with great effectiveness. This depends, however, on the following conditions: site-specific cropping organization above all with regard to the choice of species and varieties; efficient organization of the harvesting process as well as of transport and storage; science­based organization and management of work. Great importance in …

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Coronilla Varia L. As Forage Plant And For Prevention Of Soil Erosion, Jan Hofbauer Jul 2026

Coronilla Varia L. As Forage Plant And For Prevention Of Soil Erosion, Jan Hofbauer

IGC Proceedings (1977-2023)

From 1973 to 1975, the following parameters were studied in crownvetch (Coronilla varia L.), variety 'Chemung': contents of crude protein, crude fibre, digestible protein, fixed essential amino acids, and NO3-N, as well as the matter and seed yields. The matter and seed yields were analogous to data stated in foreign cita­tions, but the nutrient contents were lower. The optimum time of the first cutting (in terms of nutrient content) is from the end of May to mid-June in the first harvest year, and from mid-June to the end of June in the second. Good seed yields were obtained only from …

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New Cultivation Method And Mode Of Utilization Off Orage Sunflower (Helianthus Annuus L.), Zdzislaw Gonet Jul 2026

New Cultivation Method And Mode Of Utilization Off Orage Sunflower (Helianthus Annuus L.), Zdzislaw Gonet

IGC Proceedings (1977-2023)

A new method of sunflower cultivation was tested in a field experiment over one year. At 70 cm row spacing it is possible to use the harvester-chopper without crop yield going down. Spring seeding for a density of 200,000 plants/ha is the most favourable approach. The proper plant density at other seeding times (catch cropping) has to be ascertained in further experiments. Because of the remark­able increase of dry matter and nutrient con­tents from the beginning of flower to the stage of yellow pollen basket, sunflower grown for silage should be harvested only at this later date. Further investigations into …

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Biological And Ecological Properties Of Lotus Corniculatus L., Vitalo Strelkov Jul 2026

Biological And Ecological Properties Of Lotus Corniculatus L., Vitalo Strelkov

IGC Proceedings (1977-2023)

Tests have shown that the life duration of wild-growing birdsfoot trefoil (Lotus corni­culatus L.) on natural meadows was between five and six years. That spa_n can be extended to something between eight and nine years in a seeded-grass environment. The winter hardi­ness of birdsfoot trefoil is poor, and so is its growth under flood water, as it would be displaced by wild-growing grasses. Its yield is higher if proper drainage is provided, with ground-water tables varying between 60 and 100 cm. About 60 % or even more birdsfoot trefoil plants may be destroyed when grown under cover crops for grain. …

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Red Clover/Grass Mixtures For Continuous Forage Supply In Medium-Altitude Mountain Areas, Gerhard Knoch, Johanna Leistner Jul 2026

Red Clover/Grass Mixtures For Continuous Forage Supply In Medium-Altitude Mountain Areas, Gerhard Knoch, Johanna Leistner

IGC Proceedings (1977-2023)

The fresh forage supply of a 2000-head dairy farm with clover/grass and red clover, 'Pe­renta' variety, is possible from about the third pentad of May up to the second pentad of September. For this, 740 hectares have to be harvested, i.e. 4 to 9 ha per day. The mean energy concentration of the fresh forage amounts to 562 energetic feed equivalents (cattle) per kg DM. The lowest values of 507 and 510 energetic feed equivalents (cattle) per kg DM are obtained in the second growth of clover/grass in the third and fourth pentads of July, respectively, and the highest values, …

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Cultivation Of Alfalfa And Alfalfa/ Grass Mixtures At Higher Altitudes In Czechoslovakia, Jan Radej Jul 2026

Cultivation Of Alfalfa And Alfalfa/ Grass Mixtures At Higher Altitudes In Czechoslovakia, Jan Radej

IGC Proceedings (1977-2023)

Experimental results have shown that the cropping area of alfalfa can be extended to suitable locations of the potato growing region. Due to the great heterogeneity of soil con­ditions, red clover cannot, however, be com­pletely eliminated from the cropping pattern in this area, because alfalfa gives higher dry matter yields than red clover only after three years. Therefore, in a more humid potato growing region with compacted soils it will be more suitable to grow red clover, or mix­tures including red clover, at differentiated levels of nitrogen fertilization.

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Yield And Stand Dynamics Of Medicago Sativa As Influenced By Seeding Management, R E. Mullen, J J. Vorst, H E. Laborde, C L. Rhykerd Jul 2026

Yield And Stand Dynamics Of Medicago Sativa As Influenced By Seeding Management, R E. Mullen, J J. Vorst, H E. Laborde, C L. Rhykerd

IGC Proceedings (1977-2023)

Late summer seeding of alfalfa resulted in higher yields than did spring seeding only for the first year after seeding. Yields of late summer seeded plots progressively decreased through the third year after seeding, but yield of spring seeded plots remained constant. In the third year, there were 14 % more plants/m2 in spring seeded plots than in late summer seeded plots, but stems/m2 remained constant for both seeding dates. In second and third years, broadcast seeding resulted in greater yields and more plants and stems/m2 than row seeding. Over the three-year period high­est yields were obtained when plants and …

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Effects Of Seeding Rate On Chemical Composition Of Alfalfa Herbage, R E. Mullen, J J. Vorst, V L. Lechtenberg, C H. Noller, H E. Laborde Jul 2026

Effects Of Seeding Rate On Chemical Composition Of Alfalfa Herbage, R E. Mullen, J J. Vorst, V L. Lechtenberg, C H. Noller, H E. Laborde

IGC Proceedings (1977-2023)

Cell wall constituent (CWC) percentage, in vitro cell wall constituent disappearance (IVCWCD), and crude protein percentage were determined in alfalfa herbage from plots broad­cast seeded at 4.5, 9.0, 18.0, and 36.0 kg of seed/ha. Data were obtained for the seeding year and two years following the seeding year. CWC percentage for first cutting alfalfa herbage averaged 4.2 percentage units lower than for second cutting alfalfa herbage. How­ever, IVCWCD did not differ between first and second cutting alfalfa herbage (p < 0.05). No relationships were apparent between CWC percentage and IVCWCD, which were appar­ently not affected by seeding rates. Crude pro­tein percentage of alfalfa herbage did not vary among the various seeding rates. High plant population resulting from high seeding rates did not result in increased alfalfa herbage digestibility and crude protein.

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Cover Crops For Perennial Forage Plants Under Conditions Of High-Intensity Arable Farming, Yu K. Novoselov Jul 2026

Cover Crops For Perennial Forage Plants Under Conditions Of High-Intensity Arable Farming, Yu K. Novoselov

IGC Proceedings (1977-2023)

High and stable yields of perennial forage plants grown under conditions of high-intensity arable farming depend decisively on proper timing of sowing as well as on correct choice of the most suitable sowing method. Early-spring sowing of perennial forage plants under summer crops was found to be an opti­mum approach in the nonchernozem zone of the European part of the • USSR. The safe development of the seedlings of a given forage crop depends on proper choice not only of the species but also of the variety of the cover crop. If more nitrogen is applied, particularly in years with …

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Effect Of Planting Methods On The Establishment Of Panicum Maximum Jacq. On Natural Pastures, C Padilla, L Sanchez, J Sarroca, G Febles Jul 2026

Effect Of Planting Methods On The Establishment Of Panicum Maximum Jacq. On Natural Pastures, C Padilla, L Sanchez, J Sarroca, G Febles

IGC Proceedings (1977-2023)

Six planting methods were studied for the establishment of guinea grass on natural pas­tures (Andropogonea) minimizing mechanical soil labour and burning. Methods essayed were: asexual plant cuttings and/or botanical seeds, planted in furrows, harrowing or not before furrowing, and the latter type of seeds broadcast on soils already ploughed and har­rowed or only harrowed. The best establish­ment was obtained when seed.s were broadcast, guinea grass replacing natural pasture species in 78 to 94 % when the soil was only harrowed and when ploughed + harrowed before sow­ing, respectively. Dry matter yields of broad­cast guinea ranged from 5 to 6 t/ha …

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Establishment Of Brachiaria/Legume Pastures In The Northern Guinea- Savanna Of Nigeria, J O. Akinola Jul 2026

Establishment Of Brachiaria/Legume Pastures In The Northern Guinea- Savanna Of Nigeria, J O. Akinola

IGC Proceedings (1977-2023)

Pastures of signal grass (Brachiaria brizantha) planted alone and also in mixtures with 8 tropical pasture legumes sown by broadcasting or drilling in the 1974 growing season in the Northern Guinea Savanna of Nigeria were evaluated at establishment in terms of DM yield, N and P content, and stand survival after the dry season. High-density (30 x 37.5 cm) pure B. brizantha pasture gave the highest OM yield, 18,000 kg/ha, whilst the mixture involving drilled Desmodium tortuosum produced the lowest DM, 7100 kg/ha. Broadcasting was slightly superior to drilling, and the legumes were richer than the grasses, in terms …

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Methods Of Oversowing Perennial Soybean (Glycine Wightii) Into Pangola Grass (Digitaria Decumbens) And Native Pasture, Marta Monzote, T Hernandez Jul 2026

Methods Of Oversowing Perennial Soybean (Glycine Wightii) Into Pangola Grass (Digitaria Decumbens) And Native Pasture, Marta Monzote, T Hernandez

IGC Proceedings (1977-2023)

Four sowing methods: (1) disk harrowing and broadcast sowing, (2) broadcast sowing and disk harrowing, (3) planting with direct sowing machine, and (4) broadcast sowing, were com­pared to measure the establishment capacity of Glycine wightii cv. Tinaroo in (a) pangola grass (Digitaria decumbens) and (b) native pastures (Bothriochloa/Dichanthium mixture). A random block design with four replications was used. The germination was higher with di­rect sowing (80 and 110 plants/m2) and lower in broadcasting (8 and 15 plants/m2) in (a) and (b), respectively. All the treatments were con­sidered as established six months after sowing, although showing different percentages of …

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Surface Sowing Of Grass Seeds In The Paddy Fields In Japan, T Isamu Kawase Jul 2026

Surface Sowing Of Grass Seeds In The Paddy Fields In Japan, T Isamu Kawase

IGC Proceedings (1977-2023)

The author describes the characteristic points of climate and geographical conditions com­pared with Western Europe, and introduces the vegetation and grass production in Japan. As the temperature goes up over 25 °C during about 45 days in summertime and it is pretty wet during that period, too many varieties of grasses; including many weeds, are growing up. Winter conditions in Japan are severe and cold, it is comparatively dry. There­fore we have successions of winter grass and summer grass. In such circumstances, the climax is forest, and Japan took her way of rice crop­ping in summertime instead of stock farming …

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Possibilities Of Improving Grass Stands On Mineral Soils Waterlogged At Times, Zdenek Hrazdira Jul 2026

Possibilities Of Improving Grass Stands On Mineral Soils Waterlogged At Times, Zdenek Hrazdira

IGC Proceedings (1977-2023)

On heavy gley soils waterlogged at times, a rapid renovation of degraded grass stands on meadows resulted in an increase of crude protein yields by more than 200 %. At the same time, on larger areas sporadic drainage can be replaced by the so-called biological drainage. The rapid renovation of originally degraded grass stands must be carried out during the relatively driest time of the vegetation period, above all by combining the use of total herbicides with ploughing; in places where drinking water is collected, tillage by means of the rotavator should be the only agrotechnical measure applied. Under the …

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Methods Of Renovation Of Meadows Stands In Mountainous Regions, Bohus Holecy Jul 2026

Methods Of Renovation Of Meadows Stands In Mountainous Regions, Bohus Holecy

IGC Proceedings (1977-2023)

Under the conditions of the Carpathian moun­tain region in Czechoslovakia (Lower Tatra), a significant increase of the productiveness of natural grass stands was attained by the use of several methods of renovation. Grassland reno­vation without complete destruction of the sward allows with one or two operations with or without application of Gramoxone to ob­tain highly productive grass stands giving 7.3 to 8.4 t DM/ha on the average of 5 years. When sowing grass mixtures with the rotaseeder, row spacing (11, 20, 30 cm) is not decisive for the formation of dry matter yield. A more impor­tant factor is the seed …

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The Use Of Rotary Implements For The Rapid Renovation Of Natural Grass Stands With Smaller Irregularities Of Soil Surface, Jan Tomasik Jul 2026

The Use Of Rotary Implements For The Rapid Renovation Of Natural Grass Stands With Smaller Irregularities Of Soil Surface, Jan Tomasik

IGC Proceedings (1977-2023)

On a natural grass stand with the dominance of Trisetum jlavescens L., the suitability of rotary implements was tested for the removal of smaller irregularities of the soil surface obstructing large-scale mechanization. It was found that it is possible by means of rotary implements in one operation to com­pletely remove irregularities of the soil surface or to limit them to a minimum. The use of rotary implements for the rapid renovation helped to improve the botanical composition of the renovated stand and to increase production. The use of rotary implements for the removal of surface irregularities enables the regeneration of …

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Usefulness Of Particular Renovation Methods Of A Meadow Situated On Peat-Muck Soil, Franciszek Ksawery Bukowiecki Jul 2026

Usefulness Of Particular Renovation Methods Of A Meadow Situated On Peat-Muck Soil, Franciszek Ksawery Bukowiecki

IGC Proceedings (1977-2023)

On a meadow established in 1965 on excessively moistened peat-muck soil with a low mucking degree, sward renovation measures were carried out in the period 1971-1973. For this purpose, ploughing and rotavation were executed and compared with the treatment without tillage, at 4 treatments of a differentiated NPK fertil­ization and NPK + Cu + Mg fertilization. The effect of the tillage measures mentioned, jointly with sowing, on a differentiation of the botanical composition of the sward (and its yielding) was insignificant. On the other hand, fertilization proved to be significant for both botanical composition and yielding of sward. A fertilization …

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Renovation Of Sown Grassland - Impact On Quantity And Chemical Composition Of Herbage, Pavel Morhac Jul 2026

Renovation Of Sown Grassland - Impact On Quantity And Chemical Composition Of Herbage, Pavel Morhac

IGC Proceedings (1977-2023)

The following conclusions are drawn from the results of nine-year studies regarding the reno­vation of sown grassland and its effects on the quantity and chemical composition of herbage: The mean per-hectare herbage yields ob­tainable from sown grassland even on gravelly sandy-loamy riverside soils with little nutrient supply still are between 5.5 and 7.5 tons of dry matter. Mechanical treatments applied in the second, third, and fourth years of use did not have any positive effect on herbage yields and failed to rule out critical years. Yield decline was found to have. been influenced mainly by the reno­vation year. In view …

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The Use Of Heavy Solvents For Separating Seed From Soil, Edward D. Carter, Stephen Challis, Ian G. Ridgway Jul 2026

The Use Of Heavy Solvents For Separating Seed From Soil, Edward D. Carter, Stephen Challis, Ian G. Ridgway

IGC Proceedings (1977-2023)

Problems related to separating seeds from soil in ecological studies involving seed-seedling dynamics of annual pastures are discussed. The special roles of non-flammable chlorinated solvents as flotation agents in separating seed from soil are described. Studies showed that there was a slight, but significant (P < 0.05), overall effect of these chemicals on germination of seed of six species and cultivars: however, perchloroethylene appears to have no effect on germination.

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Effect Of Seed Pre-Sowing Hardening On Grain Sorghum, Antonio Corleto, Mallik A-As-Saqui Jul 2026

Effect Of Seed Pre-Sowing Hardening On Grain Sorghum, Antonio Corleto, Mallik A-As-Saqui

IGC Proceedings (1977-2023)

The claim that seed pre-sowing hardening treat­ment increases the drought tolerance and seed production of crops was investigated. The results obtained by this study confirm those findings. It was found that seeds, when soaked in tap water for 24 h and dried at room tem­perature until they had reached their original weight, showed a major increment in seed pro­duction and number of seeds per panicle com­pared with the control and hardened seeds sub­jected to other soaking times and the alternative method of drying. Highest seed production with 24 h soaking was found when soil fertility (fertilizer and irrigation) was satisfactory. …

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New Findings On Seed Rates In Sown Grass Farming, Erich Kreuz Jul 2026

New Findings On Seed Rates In Sown Grass Farming, Erich Kreuz

IGC Proceedings (1977-2023)

Field experiments conducted in the GDR over several years have shown that it is possible to considerably reduce seed rates specific to pure stands of valuable forage grasses. This allows to arrive at almost optimal plant spacing. On account of these findings, the seed rates for mixed and pure grass stands in commercial grass farming in the GDR were reduced to an optimum of 16-20-24 kg/ha. In view of the hitherto common seed rates of 30-40 kg/ha, this practice has allowed to save substantial amounts of grass seeds and to cut costs.

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Productivity Of Tall Fescue (Festuca Arundinacea Schreb.) And Other Forage Grasses In The North-Western Part Of The Rsfsr, V P. Spasov Jul 2026

Productivity Of Tall Fescue (Festuca Arundinacea Schreb.) And Other Forage Grasses In The North-Western Part Of The Rsfsr, V P. Spasov

IGC Proceedings (1977-2023)

Results are given of experiments conducted • from 1972 to 1976 to investigate the productiv­ity of tall fescue (Festuca arundinacea Schreb.) as single crop and in mixture with alfalfa at different levels of mineral fertilization and different cutting frequencies. In normal dry valleys in the case of fertilization with 120 kg N, 60 kg P, and 90 kg K/ha and two-cut utilization, Festuca arundinacea ('Baltika') outyielded Dactylis glomerata L. ('Jygeva 242') by 13 % in terms of dry matter, and Festuca pratensis Huds. ('Jygeva 47') by 26 %. The dry matter yield of Festuca arundi­nacea amounted to 6.6 t/ha …

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An Attempt To Select Grass Species And Varieties With Different Ripening Rhythm In Preparing Simple Seed Mixtures For Mown Meadows, Tadeusz Pawlak Jul 2026

An Attempt To Select Grass Species And Varieties With Different Ripening Rhythm In Preparing Simple Seed Mixtures For Mown Meadows, Tadeusz Pawlak

IGC Proceedings (1977-2023)

Studies were conducted into proper selection of grass species and varieties with different rip­ening rhythm, to secure optimum yields from the first growth harvested at different dates. The beginning of the heading stage in the prin­cipal components of a mixed grass stand was chosen as the optimal time for harvesting. The field experiments were carried out on three different sites in the Vistula marshland (Zulawy region). Expected satisfactory levelling of dry matter yield and of crude protein yields as well as of crude protein contents was not achieved.

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The Heading Time Of Some Varieties Of Orchard Grass (Dactylis Glomerata), Timothy (Phleum Pratense), And Tall Oat Grass (Avena Elatior) In The Mountain Region Of Sr Serbia, Drasko Colic, Momcilo Leposavic, Radovan Vazmic Jul 2026

The Heading Time Of Some Varieties Of Orchard Grass (Dactylis Glomerata), Timothy (Phleum Pratense), And Tall Oat Grass (Avena Elatior) In The Mountain Region Of Sr Serbia, Drasko Colic, Momcilo Leposavic, Radovan Vazmic

IGC Proceedings (1977-2023)

There were different investigations of 12 varie­ties of orchard grass (Dactylis glomerata), 6 of timothy (Phleum pratense), and 2 of tall oat grass (Avena elatior) in the period 1972-1975. The experiments were carried out on the mountain Jagodnja (800 m) in the south-we­stern part of SR Serbia. The difference in heading time between the earliest variety of orchard grass and the latest variety of timothy was 43 days on average over three years of investigation. This period be­tween the earliest and the latest varieties of orchard grass was 22-23 days, while the dif­ference between …

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Some Problems In Establishment And Production Of Pastures On The Eroded Tea Lands In The Mid-Country Region Of Sri Lanka, P A. Chadhokar, D A. Lecamwasam Jul 2026

Some Problems In Establishment And Production Of Pastures On The Eroded Tea Lands In The Mid-Country Region Of Sri Lanka, P A. Chadhokar, D A. Lecamwasam

IGC Proceedings (1977-2023)

There is no doubt that the mid-country region of Sri Lanka (300-1000 m elevation) offers a great scope for dairy farming on a subsistence level because of its favourable climate for the growth of both animals and pastures. This will create more self-employment and will greatly help in bridging the gap between supply and demand of milk in this country. However, to achieve these objectives it is essential to solve problems relating to the establishment and management of pastures under zero-grazing system and ensure a year-round supply of good-quality feed for the high-yielding milk animals. The added advantages of grassland …

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Dry Matter Production Of Tropical Grasses And Legumes In Thailand, Masao Hoshino, Shigeru Ono, Nittaya Sirikiratayanond Jul 2026

Dry Matter Production Of Tropical Grasses And Legumes In Thailand, Masao Hoshino, Shigeru Ono, Nittaya Sirikiratayanond

IGC Proceedings (1977-2023)

Fifty species or strains of tropical grasses and legumes were introduced and annual dry mat­ter yields were determined in 1973 and 1974 at Pakchong Forage Crop Station in Thailand. Maximum dry matter yields were recorded with napier grass in 1973 and 1974. At a high level of fertilizer application the yield of this species reached 75.6 t/ha in 1974. Hybrid napier grass, jaragua grass, buff el grass, Rhodes grass, and all Panicum species, i.e. Guinea grass, colored Guinea grass, blue panic grass, and green panic grass, showed high dry matter yield. As to decumbent type of grasses, signal grass, para …

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Development And Evaluation Of The Introduction Of Gramineae In Cuba, R Hernandez, R Machado, J Menendez Jul 2026

Development And Evaluation Of The Introduction Of Gramineae In Cuba, R Hernandez, R Machado, J Menendez

IGC Proceedings (1977-2023)

Cuba has a great endemism in its flora, and more than 400 grass species, but not prominent native plants for animal feeding in extensive production conditions. Pasture introduction started in Cuba more than 300 years ago and has been used to improve grasslands, but it was only since 1962 that an organized intro­duction programme has been carried out. In accordance with this programme, more than 2,000 accessions have been introduced, in­cluding 470 grasses. Australia is the country that has supplied most of these introductions, Africa, Asia and America being the continents in which the most outstanding introductions were originated. The …

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