Essays On Nitrogen

Figure 1 Grain yield of wheat applied with varying rates of silicate slag under sufficient and high N application rates NERS 2013, NERS 2014, and BH 2014.

NS denotes no significant effect on yield; P values reported are for the regression model between yield and silicate slag for each N rate.

Others do not pose a direct threat to human or animal health, but cause aesthetic impacts and reduced recreational values resulting from discolored water, foul odors and changes in water quality such as hypoxia (low oxygen conditions).

Additionally, algal blooms and high amounts of particles in the water can cloud the water, blocking sunlight from reaching underwater plant life, like eelgrass. The areas labeled Brown Tide on the map signify that the phytoplankton species Aureococcus anophagefferens is present.

No reported cases of the medical condition DSP or PSP have occurred on Long Island.

Harmful algal blooms have plagued the Peconic Estuary for many years.Nitrogen is a commonly occurring element that is present in air, water, and soil.Nitrogen is an essential nutrient for healthy ecosystems.In June 1985, an unusually large and persistent algal bloom caused by the marine algae Aureococcus anophagefferens, now known as Brown Tide, was first noted in the Peconic Estuary.As the name suggests, this marine algae turns the water brown and can have a serious impact on natural resources, the local economy and the general aesthetic value of the estuary.Figure from Nitrogen load modeling to forty-three subwatersheds of the Peconic Estuary- Stephen Lloyd, 2014.The western part of the estuary is particularly susceptible to the negative impacts of nitrogen pollution due to the presence of multiple pollution sources and low levels of tidal flushing.An algal bloom consists of any proliferation or rapid increase in one or several species of microalgae (phytoplankton), cyanobacteria (blue-green algae) or macroalgae (seaweed).A bloom is typically considered “harmful” if it creates any health impact to other living organisms or otherwise degrades or impairs a valued quality of the surface waters or habitat within the estuary. Some algal blooms produce toxins that cause severe illness or death in humans, wildlife, or fish.Too much nitrogen is one of the primary causes of the excessive algae growth we see in our local bays.When excessive levels of nitrogen are introduced to the estuary, from sources such as fertilizer and human and animal waste, nuisance algae and “seaweed” blooms are likely to result.

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