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Search Results: 1 - 10 of 11475 matches for " Dry Matter Yield "
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Características agron?micas do Panicum maximum cv. "Momba?a" submetido a níveis crescentes de fósforo
Ferreira, Evandro Maia;Santos, Antonio Clementino dos;Araújo, Leandro Coelho de;Cunha, Odslei Fagner Ribeiro;
Ciência Rural , 2008, DOI: 10.1590/S0103-84782008000200030
Abstract: the objective of this experiment was to evaluate the effects of the addition of increasing doses of p2o5 on the height of the dossal, number of stalks, production of dry matter of leaves and the stems of the momba?a-grass, in different ages. the experiment was implanted in an eutrophic red nitossol. the experimental designs used were complete randomized block, with four replicates, five levels of p2o5 (30, 60, 90, 120, and 150kg. ha-1) and a tester. analyzing the first and second harvest of the pasture the tillering showed positive linear response to the increasing phosphorus levels, for the third and fourth harvest, the data were adjusted to the quadratic model. increasing p2o5 doses decreased the leaf lamina fraction of aerial part dry matter, however raised the stems fraction. in the first, second and third harvest, aerial part dry matter production increased linearly (7, 15 and 19kg ha-1 of dm for kg ha-1 of p2o5, respectively). in the fourth harvest the data were adjusted to the quadratic model of regression, the maximum production (8.3mg ha-1 of dm) was obtained in the application of 103kg ha-1 of p2o5.
Impact of Simulated Airborne Soot on Maize Growth and Development  [PDF]
Angela Anda, Berndett Illes
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.38092
Abstract: Various effects of the dry deposition of soot on maize were investigated in Keszthely (Hungary) in two consecutive years. In order to be able to study a wider range of weather conditions, some of the plants were placed in a Thornthwaite-Matter type evapotranspirometer and given ad libitum water supplies. Pollution with airborne black carbon was simulated throughout the season by distributing rates of 3 g?m–2 a week using a motorised dust sprayer. Among the plant growth parameters, the leaf area index was increased by 3% - 14%, depending on the year, suggesting that the plants were able to absorb the carbon settling on the leaves. The black carbon reduced the albedo of the canopy by 17.5% - 21.8%, depending on the year, forcing the polluted maize to absorb more energy. Part of this surplus energy was utilised for increased evapotranspiration (3.9% and 11% in the two years) and to raise the surface temperature of the canopy by 1℃ - 2℃ during the mid-day hours. The effect of the contamination on maize was more intense in the hot, dry year. The unfavourable effect of soot on maize fertilisation could be observed as a significant increase in the number of deformed ears, leading to a reduction in grain dry matter. The reduction in dry matter yield for polluted maize grown with irrigation in the evapotranspirometer was far less severe than that on non-irrigated plots, suggesting that irrigation was the most obvious solution for mitigating the negative effects of contamination with airborne soot.
Yield and uptake of bahiagrass under flooded environment as affected by nitrogen fertilization  [PDF]
Gilbert C. Sigua, Mimi M. Williams, Chad C. Chase, Jr., Joseph Albano, Manoch Kongchum
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.34058
Abstract: Bahiagrass (Paspalum notatum) is one of the most important forage grasses in subtropical region of USA and other tropical regions of the world. Although tolerant to short term flooding, bahiagrass is classified as a facultative upland (FACU+) species that suggest yield and plant persistence might be reduced under periods of extended waterlogging. The objective of this greenhouse study (2008-2009) was to determine the effect of nitrogen fertilization (0, 100, and 200 kg·N·ha–1) on yield (DMY), crude protein content (CPC), and nitrogen uptake (NUP) of bahiagrass under varying flooded conditions (0, 14, 28, 56, and 84 days). Results disclosed an overwhelming effect of N application on yield and uptake component of bahiagrass. Averaged across flooding duration, results showed that DMY (R2 = 0.91**), CPC (R2= 0.96**), and NUP (R2 = 0.99**) were linearly related to increasing levels of N fertilization. Plants without N fertilization that were submerged between 14 to 84 days had significantly lower amount of DMY when compared with plants that were fertilized with 100 or 200 kg·N·ha–1. Comparable DMY and NUP were obtained between plants fertilized with 200 kg·N·ha–1) at 0 day of flooding (11.7 ± 5.0 ton·ha–1) and plants fertilized with 200 kg·N·ha–1 at 84 days of flooding (9.8 ± 2.7 ton·ha–1). The practical implication of this study is that waterlogging may hamper yield and uptake while nitrogen fertilization could improve yield and uptake of bahiagrass under waterlogged condition.
Effect of Sowing Rate on Agronomic Traits of Sorghum (Sorghum bicolor Moench) in Southern Kyushu, Japan  [PDF]
Sachiko Idota, Yasuyuki Ishii, Mayumi Izu, Yukistugu Nishimura
Agricultural Sciences (AS) , 2016, DOI: 10.4236/as.2016.75030
Abstract: Newly released sudangrass-type sorghum cv. “Tarzan” was bred for use as a bioenergy-resource feedstuff in Germany. Since the genotype was collected at a high altitudinal site in the Central Africa continent, its early growth is vigorous at low temperature. As vigorous growth at low temperature is derived from high tillering ability, the sowing rate of this genotype should be reduced from the ordinary rate for sorghum. Thus, in the present study, the optimal sowing rate of cv. “Tarzan” in southern Kyushu was determined by the effect of sowing rate at 0.5, 1.0, and 1.5 g·m-2, designated as low (L), middle (M), and high (H) levels, respectively, on growth habit compared with the normal sudangrass cultivar “Roll-king II”. Early growth was retarded by heavy precipitation in June, after which the growth was comparable for the two genotypes. Dry matter yield of “Tarzan” increased with higher sowing rate; the H level yield was 1298 g·m-2, and the yield was not adversely affected by the humidity and heat in the summer growing season, compared with “Roll-king II”. This suggests that “Tarzan” can adapt to the humid, hot climate in southern Kyushu, and the optimum sowing rate of “Tarzan” should be as low as 1.0 - 1.5 g·m-2, which is less than one-fifth to one-third that of forage sudangrass grown in the region.
Effects of Cutting Interval between Harvests on Dry Matter Yield and Nutritive Value in Alfalfa  [PDF]
Doohong Min
American Journal of Plant Sciences (AJPS) , 2016, DOI: 10.4236/ajps.2016.78118
Abstract: Understanding the relationship between dry matter yield and nutritive value throughout the growing season will help optimize the cutting intervals between harvests in alfalfa (Medicago sativa L.). The Ogallala Aquifer is a very important water source when growing alfalfa in Southwest Kansas and unfortunately, the water level of the Ogallala Aquifer is shrinking. The objective of this study was to determine the optimum cutting interval that optimizes dry matter yield and nutritive values of alfalfa. Alfalfa was harvested with different cutting intervals, i.e., every 28, 35, 42 and 49 day, which was equivalent of 5, 4, 4, and 3 cuttings per year, respectively in 2013 and 2014. Based on 2-yr total yield, by delaying alfalfa harvest by 21 days, i.e., from every 28th day to 49th day, alfalfa yield increased by 2.25 Mg/ha whereas by 5.58 Mg/ha by delaying cutting intervals from every 28th day to 42nd day. Although harvesting alfalfa every 42nd day had the same cutting frequency as the 35th day treatment (i.e., 4 cuttings per year), the treatment harvesting every 42nd day had significantly higher alfalfa yield than 35th day cutting interval. Alfalfa yield increased by approximately 20% by delaying one week for harvesting alfalfa from 35th to 42nd day interval, based on dry matter yields of 2013 and 2014. As cutting interval increased from every 28th to 49th day, crude protein (CP) content decreased. In contrast to CP, acid detergent fiber and neutral detergent fiber increased as the cutting interval and stage of maturity increased in 2013 and 2014. The results suggest that alfalfa producers in Southwest Kansas possibly could reduce the cutting frequency from 5 to 4 per year. Cutting interval of every 42nd day between harvests appears to be the optimum when considered a dry matter yield and nutritive values in alfalfa.
White (Trifolium repens L.) and Arrowleaf (Trifolium vesiculosum Savi) Clover Emergence in Varying Loblolly Pine (Pinus taeda L.) Tree Alley Spacings  [PDF]
Taylor C. Adams, Dirk Philipp, David M. Burner, John Jennings, Becky Mc Peake, Amanda J. Ashworth, Daniel H. Pote, Joan M. Burke, Robert Rhein
American Journal of Plant Sciences (AJPS) , 2019, DOI: 10.4236/ajps.2019.104048
Abstract: Agroforestry systems have the potential to provide year-long income opportunities via the integrated forage or crop, timber, and livestock. Legumes are an attractive alternative option during the growing season when more traditional forages may not be as productive. The objective of this study was to test the establishment of arrowleaf and white clover grown under varying pine tree alley widths. In 2011, existing forage was removed in 15-yr old loblolly pine tree row alleys of different widths (3.7, 4.9, 7.3, and 9.8 m), including an open area. Arrowleaf, as an annual, was replanted in 2012. Seedlings were counted twice/year, while dry matter was measured three times/year. Photosynthetically active radiation (PAR) was measured in all alley widths to compare light penetration through the canopy. Hot and dry conditions occurred throughout 2012, affecting results. In 2012 and 2013, the greatest PAR for most treatments was observed in June. Seedling counts for all treatments were greatest immediately after establishment, and gradually declined throughout the course of the study. Dry matter yields increased throughout the growing season, and were greatest in arrowleaf clover in the open area on all measurement dates; however, increased weed pressure and repeated flooding affected yields. This study demonstrated that clover establishment in shady wooded areas is possible, but only under suitable environmental conditions.
Efecto del régimen de riego en el rendimiento de alfalfa para corte en el Valle Central de Catamarca, Argentina
Demin,Pablo Enrique; Aguilera,Juan José;
Revista de la Facultad de Ciencias Agrarias. Universidad Nacional de Cuyo , 2012,
Abstract: in the province of catamarca there is a large area planted with alfalfa. lack of knowledge of crop water requirements in this area constitutes a serious problem. an irrigation experiment was conducted in randomized blocks in valle central with four treatments and four replications. the treatments consisted in replenishing soil moisture content at different thresholds: 75, 50, 25 and 0% of the total soil water storage capacity. dry-matter production per treatment was evaluated in seven cuttings. results showed that when irrigating with a 75 and a 50% threshold, similar dry-matter yields were obtained equivalent to 25,674.4 kg ms.ha-1 and 24,215.4 kg ms.ha-1, respectively. significant differences were found (p < 0.0001) between the means of these treatments and the other two treatments. an irrigation threshold of 25% yielded less than16,366.7 kg.ha-1 and an irrigation threshold of 0% yielded less than 9,970.9 kg.ha-1. it can be concluded that alfalfa production is significantly reduced when irrigation intervals are very long.
Producción de materia seca de Leucaena leucocephala a diferentes edades de corte y épocas del a?o bajo un sistema de riego artesanal
Sánchez,Alexander; Romero,Carlos; Araque,Cesar; Flores,Ramón;
Zootecnia Tropical , 2005,
Abstract: summary to evaluate dry matter yield of leucaena leucocephala under drip irrigation system, it was carried out a trial in zamurito?s area, municipality of buchivacoa, falcon state, venezuela. the experimental area was 1.500 m2, irrigated by means of a handmade dripping system, with a consuming water use of 4 mm/day, watering sheet of 54 mm/irrigation, and an application frequency of 3 days. the variables were: yield and composition of dry matter (dm). the experimental area had four replicates and randomly distributed, according to the following treatments: harvest ages: 60, 75, 90, 105, and 120 days, and season of the year: end of rainy season (ers), and dry season (ds). results showed that both yield and distribution of dm in both seasons and cutting ages were highly significant (p<0.01), with the highest value in ers, when compared to ds (1284 vs. 852 kg dm/ha, respectively). likewise, it was found a contribution of 64% of edible fraction (leaves and stems < 6 mm) of dm at 75 and 105 days of age on the top and the middle of the plant profile at the end of the rainy season, where the highest values were found. implementation of a handcrafted drip irrigation system represents an alternative for growing leucaena in the semiarid area of falcon state.
Morfologia e parti??o de assimilados na batateira em fun??o de época de amostragem e de doses de potássio
Reis Júnior, Roberto dos Anjos;Fontes, Paulo Cezar Rezende;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999000500010
Abstract: this study was conducted in order to evaluate potato (solanum tuberosum l.) morphology and dry matter partition in response to sampling time, k levels and its residue. six k levels (0, 60, 120, 240, 480 and 960 kg k2o ha-1) were applied in the field as potassium sulfate, in randomized blocks design, repeated four times. baraka potato tubers were seeded spaced 0.8 x 0.3 m. plants were sampled at 20 and 48 days after its emergence (dae) to estimate leaf area, stem length, number and fresh and dry matter yield of leaf, stem and tuber, and dry matter content of leaf and stem. only stem length increased with k fertilization, resulting in smaller overshadow of plant. in the first experiment, at 20 dae, potato was presenting, in media, 42 leaves, three stems, 5,389 cm2 of leaf area, 157.1 and 216.4 g of fresh matter of stem and leaf, respectively, and 6.2 and 9.2% of dry matter content of stem and leaf, respectively.
UNAPAL -Abanico 75: nuevo cultivar de zapallo con alto contenido de materia seca en el fruto para fines agroindustriales
Baena García,Diosdado; Ortiz Grisales,Sanín; Valdés Restrepo,Magda Piedad; Estrada Salazar,Edgar Iván; Vallejo Cabrera,Franco Alirio;
Acta Agronómica , 2010,
Abstract: using three diallel crosses among populations of butternut squash, with different levels of inbreeding (s0 x s0), (s1 x s1) y (s2 x s2), two hybrids and two inbred lines of butternut squash were selected, for its high dry matter content in fruit and plant production. seven hybrid populations were formed from the selected genotypes. they are genetically stabilized by fraternal crossing and were evaluated in different environments of valle del cauca. population one was selected, which presented a plant production between 29 to 32 kg; average fruit weight between 5 -6 kg; 4-5 fruit per plant; dry matter in fruit among 24-26%; globular form ribbed bright green external color and deep yellow to orange flesh color (12 to 14 roche fan). this population was registered in institute colombian agropecuario ica, under the name unapal-abanico-75.
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