Yes, the amount leached depends on the rate of plant uptake, the amount of rainfall, and the texture and type of soil. It is also affected by individual farm characteristics, such as the stocking rate.

From one of the study, it was assumed 7 percent of the nitrogen applied is lost due to leaching. For details go through this given useful link.

http://archive.stats.govt.nz/browse_for_stats/environment/environmental-reporting-series/environmental-indicators/Home/Fresh%20water/nitrogen-leaching-agriculture.aspx

Very trick question. The number will greatly vary with soil texture throughout the soil profile, irrigation management, rainfall pattern, climate, rooting pattern of the crop (shallow or deep) and most of all the management of applied fertilizers (source, rate, time and placement). The best way to get references will be to search via Google Scholar.

Please check this useful PDF attachment.

I agree with Dr Bijay Singh.He has given very comprehensive reply on the subject.

Please have a look at some interesting work on the issue...

My appreciations for the scholarly answer by Dr. Bijay Singh and I recommend the answer. Some years back we carried out a EIA on the effect of agricultural activities, such as application of pesticides and fertilizers, on the water quality. It was later found out that there was no deterioration of water quality, as the rate /quantity of application of pesticides/fertilizers was less than the recommended quantity. This supports the above statement of Dr. Bijay Singh --"most of all the management of applied fertilizers (source, rate, time and placement)".

I still remember , citrus is grown in Florida ( the most commercial citrus belt worldover) under 100% sand , and the fertigation technique is so precisely developed that there is hardly any leaching of applied nutrients to groundwater , considering the effective rootzone and partitioning of nutrients and irrigation across crop phenophases to real perfection....

I agree totally with Bijay Singh answer.

i agree with Bijay sir

Yes, the amount leached depends on the rate of plant uptake, the amount of rainfall, and the texture and type of soil. It is also affected by individual farm characteristics, such as the stocking rate.

From one of the study, it was assumed 7 percent of the nitrogen applied is lost due to leaching. For details go through this given useful link.

http://archive.stats.govt.nz/browse_for_stats/environment/environmental-reporting-series/environmental-indicators/Home/Fresh%20water/nitrogen-leaching-agriculture.aspx

I agree with Bijay sir. Simple but complete answer.

Nitrogen Utilization Efficiency for common fertilizer application is about 50%. The means about one half of the nitrogen is lost either by denitrification or leaching. If the soil Nitrogen decreases as it often does in a conventional fertilizer regime the losses of nitrogen from denitrification leaching and losses from soil organic matter decrease can be very significant. Excess lost nutrients lead to contamination of shallow wells, deterioration of stream water and the development of marine dead zones around the mouths of major rivers which drain off cropped areas.

it depends upon the soil type

N leaching is depends on various factors. A general percentage of N leaches to groundwater can not be given untill and unless provide some basic information like soil type, fertilizer management, irrigation management, etc. as said Dr Bijay Singh.

90-95% of the the total leached nitrogen comes from the soil, only 5-10% of the total losses comes from the fertilizer. This is confirmed by experiments with 15N.

Attached is a graph the loss of fertilizer is quantified using N15 in organic and conventional soils at 30 year plus Rodale comparative study of farming systems. The fertilizer nitrogen loss is 38 and 16% for organic and conventional fertilizer treatment. The nitrogen in the organic treatment mainly accumulated in the soil and the activity of soil microbes and its retention of Nitrogen is much higher than in conventional system management. Organic management using the legume for the Nitrogen source and this allows the nutrients to a more closed cycle rather than so leaky like synthetic input promotes. This increased loss is important since it contributes to environmental and health issues.

There is no fast answer. It depens on many factors!! Type of fertilizer used, soil type, soil moisture, rainfall, irrigation, slope of the land, types of crops grown etc. play a significnat role in nutrient leaching.

Dear, its depends on nature of fertilizer you used and so many other factors such as soil texture, soil structure, soil porosity, soil water holding capacity, irrigation, precipitation, soil slope, soil temperature and so many others factors contributes to leaching. You can manage some of them to reduce leaching upto some extent.

It depends on type of fertilizer, method of application, quantity of fertilizer used, soil type and water table depth

It depends of type of fertilizer, applied dosage compared to plant needs, method of application, soil type, rate of irrigation and/or rain and climate.

Some literature mentioned that only 5% of applied fertilizers are taken up by the plants. the rest is either leached and/or fixed in the soil. So percentage leached depends on many factors such type of soil, health of soil (microbial activities and organic matter content), application dosage, irrigation system and rate, and crop type