Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"nitrogen fertiliser"”.
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Sheep wool pellets as slow-releasing nitrogen fertiliser
Þessi rannsókn kannaði virkni íslenskra sauðfjárullar sem sjálfbærs valkosts við hæga losun á köfnunarefnisáburði til að bæta jarðvegseiginleika og einnig vöxt og uppskeru nytjaplantna. Rannsóknin var framkvæmd bæði í gróðurhúsi (með því að nota ófrjósaman mó- og vikurjarðveg) og á akri (með histic …
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The profitability of nitrogen fertiliser usage on Canterbury irrigated sheep farms
The profitability of nitrogen usage on Canterbury irrigated sheep farms was investigated using a deterministic feed budget model. Effects of nitrogen usage on stocking rate and animal performance was determined. Current prices were used to determine profitability using partial budget analysis. …
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A systems approach to the economic evaluation of nitrogen fertiliser use in sheep farming enterprises
… is developed to evaluate the economic use of nitrogen fertiliser in sheep farming enterprises which depend on seasonal production of grass-legume pastures as the main source of feed. Nitrogen fertiliser has not been widely used in grass-legume based pastoral systems. These farming systems have …
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Strategic applications of nitrogen fertiliser to increase the yield and nitrogen use efficiency of wheat.
In southern Australia a large proportion of crop nitrogen requirements are usually applied early in the season, either just before or at sowing, or during the first 6-8 weeks after sowing. However, the time of greatest demand for nitrogen by wheat crops is during the stem-elongation phase when the …
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Effect of urinary nitrogen, dairy shed effluent and nitrogen fertiliser on nitrate leaching from a pasture soil
… from grassland have focused solely on single nitrogen (N) sources (e.g. fertiliser. urine, dung or effluent). Under grazed pasture, however, more than one N source is usually returned to the system either directly or indirectly. Therefore it is important to improve our knowledge and …
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Maximising the benefits of cover crops through optimising the use of rotations, nitrogen fertiliser and organic manures
… spring barley yields whilst facilitating lower nitrogen inputs. Under controlled conditions, they provided both yield and nutrient cycling benefits. However, under field conditions such yield benefits did not materialise. Cover crops were found to sequester considerable amounts of nutrients over …
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The influence of ryegrass sowing rates and nitrogen fertiliser on white clover establishment : A dissertation submitted in partial fulfilment of the requirements for the degree of Bachelor of Agricultural Science with Honours at Lincoln University
… rates (0, 5, 10, 20 kg/ha) with four rates of nitrogen fertiliser (0, 20, 40, 80 kgN/ha). White clover (Trifolium repens L.) was sown at 3 kg/ha in all plots. Ryegrass and white clover seedling development, herbage production, botanical composition, herbage nitrogen percentage and grazing …
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Climate change and global crop yield: impacts, uncertainties and adaptation
… Finally, I explored tradeoffs between increasing nitrogen fertiliser use to close the global maize yield gap and the resulting nitrous oxide emissions. I found global maize production increases by 62% based on current harvested area using intensive rates of nitrogen fertiliser. This raises the …
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Anhydrous ammonia in vegetable cropping
… containing 82%N, is the highest analysis nitrogen fertiliser available for commercial use. Lyons (1966) states that it has many economic advantages in handling, transporting and application over conventional nitrogen fertilisers and that the high nitrogen content, plus the fact that it can …
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Effect of replacing nitrogen fertiliser with gibberellic acid on response of perennial ryegrass and white clover pasture : A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
… farms are no longer allowed to use high rates of nitrogen (N)-based fertiliser to achieve maximum pasture production due to the associated losses of N through nitrate leaching and nitrous oxide emissions. Gibberellic acid (GA), a naturally occuring phytohormone, has shown in short term studies, to …
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The construction, irrigation and fertiliser nutrition of UK golf greens
… applied were three levels of irrigation, five of nitrogen fertiliser and two of phosphate. The trial was maintained as a golf green, and artificial wear was applied. Soil moisture deficit predictions by the Meteorological Office conformed with measurements from the soil construction, but the …
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Distribution of nematodes in pasture soil across seasons and in combination with plant species and fertiliser application
… pastoral land use has increased with the use of fertilisers and the selection of highly productive pasture plant species to increase pasture production. When choosing a ryegrass cultivar infected with selected endophyte fungus, ploidy choices are vital for determining pasture production. Modern …
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Effect of Lolium perenne L. ploidy, Trifolium repens L. inclusion and cow breed on the productivity and profitability of pasture-based, spring-milk systems
… spring at a stocking rate of 2.75 cows/ha and a nitrogen fertiliser rate of 250 kg/ha annually over four years (2014 to 2017). Milk production did not differ between the two ploidies over this four year study, but cows grazing the PRG-white clover treatments had significantly greater milk yields …
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Modelling New Zealand dairy farm systems to design greenhouse gas mitigation strategies
… by reducing any combination of stocking rate, nitrogen fertiliser and supplement use, was a key strategy in reducing GHG emissions in an economic manner across the whole range of farming systems and regions considered in this study, as well as for all levels of emissions constraints tested. The …
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Fostering Populations of Arbuscular Mycorrhizal Fungi Through Cover Crop Choices and Soil Management
… it was shown that long term application of nitrogen fertiliser influenced AM fungal community composition, but this observation was not made in a shorter validation experiment conducted at the field scale. In a sepa-rate trial, addition of a commercial AM fungal inoculum had little impact on …
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Disentangling plant-microbe interactions under environmental change
The application of nitrogen fertiliser to maintain agricultural productivity is one of the key aspects of modern farming. These activities help provide for a growing population under climate change pressures with higher intensity droughts occurring more frequently. However, such manipulations alter …
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Next generation dairy systems for Canterbury: A dissertation submitted in partial fulfilment of the requirements for the Degree of Bachelor of Agricultural Science with Honours at Lincoln University
Within the current New Zealand dairy systems nitrogen inputs and out-puts play an ever increasing role on the dairy sectors environmental foot print. The New Zealand dairy sector has the need for a more efficient and yet comparatively profitable farming system, that will preform under tougher …
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Spatial patterns of wheat grain composition in relation to nutritional quality and processing properties
… found for all parameters that were measured. Nitrogen fertilisation was found to have a strong impact on the amount of protein (both quantity and quality) and their distributions. Moreover, it also influenced, albeit to a much smaller extent, the amount of starch. The detailed information on …
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