nitrogen is included in the makeup of protein and nucleic acid. also it is often the limiting nutrient for what type of organism

Despite its abundance in the atmosphere, nitrogen is often the most limiting nutrient for plant growth. This problem occurs because most plants can only take up nitrogen in two solid forms: ammonium ion (NH4+ ) and the ion nitrate (NO3- ).

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The manufacturing, selection and use of materials is often a consumptive and wasteful process. Each phase of a material’s life cycle requires energy and can produce harmful air, water and soil pollutants and waste products. Nevertheless, homeowners and gardeners can minimize the waste, energy consumption and pollution associated with extraction and manufacturing processes by limiting the use of new materials and other products.

It’s best to start with the old adage “reduce, reuse, recycle” as a way of practice. Downsizing a landscaping project to reduce the amount of materials, redesigning the project to reuse previously used materials, or finding ways to recycle materials are all first steps in the sustainable design process. Another alternative solution is to salvage and reuse materials discarded by neighbor or friend, perhaps in a new and novel way.

Retaining existing materials avoids costs for demolition, transportation and the disposal of demolished materials in a landfill. This practice can also create a unique sense of place and connect users to the garden or landscape. If you are buying new, opt for natural, untreated, least toxic and recyclable products made locally. A growing number of “certified green” products are becoming available, simplifying things for consumers. And you can promote recycling by buying products with recycled content, which are generally less expensive than virgin raw materials.

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