The crops uptake the concentration of nutrient he needed.

May be the foliar application have some effect if used high doses.

If applied at recommend rates, there is hardly any I'll effect in human health esp in case of grains like wheat,corn,rice etc.

However for leafy vegetables like spinach, coriander, lettuce etc ,if foliar application of higher concentrations of N is given and eaten raw as a salad,it might have I'll effect on human health.

Consumption of carrots,radish, turning, tomato as raw salad with excessive fertilizer may also pose health threat.

If ferilizers used in unbalanced manner may affect the human health through pollotion viz., soil and air. Also as kulvir sir said foliar application before harvesting may also affects the human health. In proper proportion and at proper time application of fertilizer is effective in increasing yield.

This topic is controversial, and I would recommend you to read the legacy left by William Albrecht. Our experience shows that plants forced with fertilizers (the big 3 NPK) are less resistant, less nutritiously balanced, and rot more rapidly than those which are not receiving fertilizers (NPK). Our experience has shown that the addition of these fertilizers is destroying the presence and balance of the microbiome responsible for the production of nutrients in the soil...thus making the farmer more and more dependent...

The link between health issues and less nutritious crops is not clearly established, but there are many correlative studies that would allow suspicion. Modern humans seem to have lost their sense for healthy plants, but when you deal with sheperds, and dairy or cattle or other animal farmers, they will tell you that an animal, given the choice, will always select the more balanced plant to eat.

There is 190 million tons of urea produced in the world.......Fertilizer and nutrient efficiency could save up to 40% of the loss particularly in nitrogen. That is 40% less carbon emissions and 40% less into waterways in which we consume in some form at some level. It could also positively effect water quality. The effects are not just direct consumption but the sundry health and environmental issues around efficency.

Everything that use in excess quantity cause detrimental effects so precision application of fertilizer is need of hour.

there are several harmful effects of chemical fertilizers. Some of the harm chemical fertilizers may cause include waterway pollution, chemical burn to crops, increased air pollution, acidification of the soil and mineral depletion of the soil, mineral Depletion ,and Mineral Depletion.

Excessive use of nitrogen & phosphorus fertilizers can lead to water pollution via runoffs but donot cause direct effect to human health. On the other hand, it is a waste and costly.

De ninguna manera si se utilizan en cantidades adecuadas. Los fertilizantes nutren a las plantas y las plantas bien nutridas son resistentes a plagas y enfermedades y sirven como alimento para el ganado y el ser humanano. Se debe aplicar en la cantidad correcta, en el momento correcto, en la forma correcta y de la fuente correcta. Sin los fertilizantes la agricultura comercial no tiene futuro.

Dear Imadud Din , there are threshold levels for everything and if it exceeds that level, it will have a negative effect. When we see the benefits that we are getting from the chemical fertilizers, their harmful effects are incomparable.

I have got some information about your issue and please go through it.

📷 Chemical pesticides can have far-reaching effects on human health. The ycan contaminate the quality of surface water and groundwater, as well as cause toxicity within most individuals who consume pesticide-sprayed fruits and vegetables. Since most farmers use these fertilizers on their farm, animals receive first-hand exposure to these toxins--thus causing people who ingest non-organic meat products to experience pesticide toxicity, too.

📷 One of the benefits with chemical fertilizers is that it’s custom-made for our requirement. If the soil is rich in nitrogen and potassium, it will need a fertilizer that will take care of the lack of phosphorus. Chemical fertilizers give us the option of using phosphorus-rich fertilizers. Chemical fertilizers are very useful because it works as fast food for plants. They can absorb the nutrients immediately and the fertilizer works quickly. The use of chemical fertilizers has a great importance for the worlds food production and food prices. If we didn’t had the opportunity to use chemical fertilizers it would have been higher food prices. This would have affected poor people the most. Chemical fertilizer is more "hygienic" because natural fertilizer can cause viruses or bacteria in plants which leads to disease in humans who eats them. It is also much cheaper than natural fertilizer.

📷 Potassium is essential for the bud placement and fruit quality. Potassium also has much to say on the plants ability to endure the winter. Phosphorus has a lot to say for the development of the root system and the plant quality. Big and strong roots provide a healthier and more resistant plant. Nitrogen makes sure that the plants evolve and lets the green parts grow. The three main nutrients that plants needs supplies of are nitrogen (N), phosphorus (P) and potassium (K). All fertilizers contain either one or more of these nutrients.

📷 The biggest issue facing the use of chemical fertilizers is ground water contamination. Nitrogen fertilizers break down into nitrates and travel easily through the soil. Because it is water-soluble and can remain in groundwater for decades, the addition of more nitrogen over the years has an accumulative effect.

📷 Learn more about organic fertilizer for your own garden. Take part in safeguarding organic practices and standards. Visit Organic Consumers for details. Support organic and sustainable agriculture. Know your farm and your farmer and understand their practices. If you are on well-water have your water tested regularly by a reputable lab. Knowing and understanding the effects of chemical fertilizers doesn’t do us much good without action on our part. Knowing how to protect our health is what counts.

if applied precisely and in intergrated manner through organic , incorganic and biofertilizer then it wont effect, and Yes if you use only chemical fertilizer then it surely effect your health due to some toxic elements.

Dear Imadud Din

The excessive use of nitrogenous fertilizers decreases the potassium content of the food grains. Potassium is important element, which controls the rise of blood pressure and also averts the risks of heart attack. The excessive potash treatment decreases valuable nutrients in foods, such as vitamin C (ascorbic acid) and carotene. Vitamin C helps in boosting the immune system of the body while carotene is the precursor of vitamin A, which is important for the vision. The nitrate fertilizer increases the crop yield (carbohydrate) but at the expense of proteins. Moreover, subtle balance of amino acids is disturbed within the protein molecule thus lowering the protein quality. Therefore, increase in incidence of diseases such as cardiovascular disorders, hypertension, night blindness and other eye disorders; malnutrition and susceptibility to infectious diseases are due to the excessive use of chemical fertilizers in agriculture.

Good luck!

The excess quantities of nitrogen gets stored in the vacuoles of plants. In addition, besides to applying high nitrogen concentration, the genetic factor, harvesting time and light intensity had an effect on the accumulation of nitrogen as nitrate until it reaches toxicity level. On the other hand, high concentrations of nitrate in vegetables lead to the occurrence of methaemoglobinemia and possibly gastric cancer as well as other diseases. Thus, the European Union established the maximum permissible levels from 3,500 to 4,500 mg N-NO3- kg-1 fresh weight for the winter crops and 2,500 mg of N-NO3- kg-1 for summer crops depending on cultivation modes

Si los fertilizantes químicos, la mitad de la humanidad ya se habría muerto de hambre, los fertilizantes químicos son una bendición de Dios

I agree with Dr. Al- Tawaha and, in addition to his comments about the fate of nitrates and their impact on human health (methaemoglobinemia also known as baby blue syndrome) is a serious health issue that may affect the health of infants and young children when nitrate levels in drinking water are high. Nitrates in human body tissues are converted in nitrosamines and these have been proven to be carcinogenic when they accumulate in the body. Beware of residues of nitrates in leafy vegetables (e.g.: spinach, lettuces, radicchio, beets and more) when this species are grown intensively, under greenhouses, to be available to consumers at a time of the year (deep of winter) when they normally are not.