Experimental Design (Ag) Essay

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Experimental Design: Plant Density Aim: Effect of plant density on plant growth. Hypothesis: The closer of the seeds, the less growing will occur. Equipment: Water, sunlight, soil, fertilisers (if needed), Greenhouse (if needed), trowel, 5 pots, a pack of 1 gram garlic chive seeds (approx. 250 seeds), worms, measuring cup. Background information: Density-dependent growth in plants occurs when resources are limited. At high density, individuals must share resources, and thus a smaller amount of a given resource is available to individual. Competition for resources may affect growth rate, development, and reproduction. Competition is one of the most important factors controlling plant communities, along with resources, disturbance, grazing and mutualism. Since all plants require a few basic elements, the resource is generally light, water nitrogen or phosphorus, depending upon the species and the location. The effects of competition are widespread, and easily observed in mixtures of crops. In the late 1800s, Darwin wrote extensively about the importance of competition in nature, particularly its role in driving natural selection. Thereafter, interest in the phenomenon grew. There were many experiments with both crops and wild species, most now overlooked. Models of competitive interactions were also constructed, with the number and size of the models increasing rapidly with the advent of computers in the 1970s. Reference: Paul Keddy. Competition -- an introduction and annotated bibliography for plant communities. Plant Description Garlic chives have narrow, flat grey-green leaves to 1-foot (30.48 cm) long. It has white blossoms appear in great profusion in summer and good cut-flowers for fresh or dried arrangements. Both leaves and flowers have a pronounced garlic flavour that adds zest to salads, stir-fries, rice and noodles. Planting Details

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