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[29] [30] The first number represents the percentage of nitrogen in the product; the second number, P 2 O 5; the third, K 2 O. Fertilizers do not actually contain P 2 O 5 or K 2 O, but the system is a conventional shorthand for the amount of the phosphorus (P) or potassium (K) in a fertilizer. A 50-pound (23 kg) bag of fertilizer labeled 16-4-8 ...
Organic nutrients increase the abundance of soil organisms by providing organic matter and micronutrients for organismal relationships such as fungal mycorrhiza, [47] (which aid plants in absorbing nutrients), and can drastically reduce external inputs of pesticides, energy and fertilizer, at the cost of decreased yield. [48]
Some plants are sensitive indicators of the chemical environment in which they grow (Dunn 1991), [19] and some plants have barrier mechanisms that exclude or limit the uptake of a particular element or ion species, e.g., alder twigs commonly accumulate molybdenum but not arsenic, whereas the reverse is true of spruce bark (Dunn 1991). [19]
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Biofertilizers are cost-effective and ecofriendly in nature, and their continuous usage has been shown to enhance soil fertility. [20] Besides promoting growth by multiple mechanisms , biofertilizers produces substances suppressing phytopathogens , guarding plants from abiotic and biotic stresses and detoxification of belowground pollutants ...
Slow- or controlled-release fertilizer: A fertilizer containing a plant nutrient in a form which delays its availability for plant uptake and use after application, or which extends its availability to the plant significantly longer than a reference ‘rapidly available nutrient fertilizer’ such as ammonium nitrate or urea, ammonium phosphate ...
Unshaded coffee plants grown with fertilizer yield the ... $160 per pound or $30 per ... keeping the coffee separate from other coffees adds costs, and so only coffee ...
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