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Nitrogen fertilizer being applied to growing corn in a contoured, no-tilled field in Iowa.. Nutrient management is the science and practice directed to link soil, crop, weather, and hydrologic factors with cultural, irrigation, and soil and water conservation practices to achieve optimal nutrient use efficiency, crop yields, crop quality, and economic returns, while reducing off-site transport ...
This is not the best practice, though, because corn smut can also overwinter in the soil; crop rotation is recommended. Lastly, as excess nitrogen in the soil augments infection rate, using fertilizer with low nitrogen levels, or just limiting the amount of nitrogen in the soil proves to be another way to control corn smut. [20]
Sodium molybdate is a typical source of Mo. Typical soil and foliar application rates are 50–200 g Mo ha −1; recommended rates for seed treatment range from 7–100 g Mo ha −1. [1] Other sources recommend application levels of 0.25 kg/acre. [3]
Rutgers Cooperative Research and Extension recommends the total nitrogen rate for the season should not exceed about 125 pounds per acre [12] (140 kg per hectare). Corn maze crops should be planted from mid to late May in the northern hemisphere, or mid to late November in the southern hemisphere.
Synthetic nitrogen fertilizers, such as ammonium nitrate and urea, are commonly applied to crops to replenish soil nitrogen levels and enhance crop productivity [3] These fertilizers provide readily available nitrogen for plant uptake, thereby promoting vigorous vegetative growth and improving yields.
Through the increasing use of nitrogen fertilizer, which was used at a rate of about 110 million tons (of N) per year in 2012, [131] [132] adding to the already existing amount of reactive nitrogen, nitrous oxide (N 2 O) has become the third most important greenhouse gas after carbon dioxide and methane.
A carbon-to-nitrogen ratio (C/N ratio or C:N ratio) is a ratio of the mass of carbon to the mass of nitrogen in organic residues. It can, amongst other things, be used in analysing sediments and soil including soil organic matter and soil amendments such as compost .
Salt indexes can have some relation to the rate of fertilizer burn in plants, with fertilizers of a salt index above 20 not being recommended for use with particularly sensitive crops. Below is a chart of salt indexes and percent nitrogen of some of the most commonly used fertilizers. [4]
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