for an optimum fertilization
It is important to
develop precise methodologies when it comes to incorporate fertilizers in the wheat
fields, because that will allow for optimized costs and returns, and all of this makes
better business sense.
The specialists recommend an analysis of the soil to determine its
fertility and requirements. We have to do this so that we may know the levels of phosphor
and the soils capacity to return nitrogen.
to the sow, an adequate quantity of phosphor to achieve high efficiency levels. Depending
on the available phosphor content and efficiency expected, correct the levels according to
the next table.
- If soy
is going to be sowed after the wheat, apply 30% more of phosphate fertilizer to increment
the residuals and benefit considerably soy production.
- If you
do not own a fertilizer machine, which is capable of applying fertilizer under and on the
sides of de plant, apply phosphor manually. In this case, increase the amount by 30% to
compensate the lost of efficiency. Do not apply more than 120Kg per hectare of phosphate.
- If the
analysis would have recommended greater quantity, apply it pre-sowing.
It is not convenient to apply all the nitrogen at once: during sowing, it
could damage the germination and not all could be very efficient. For an optimum handling
of nitrogen, the next steps are recommended:
we need to determine the nitrogen requirement. Estimate the potential returns by the
quintal and calculate how much nitrogen is needed in Kg/ per hectare by multiplying it by
rains are enough to assure, especially on early sowing, up to 100Kg per hectare of
nitrogen. If rain would have been sparse, 50Kg per hectare is expectable.
between half and two thirds of what remains from last sowing. With this practice you can
use, with no problems of potential damage to de seeds, whatever amounts of urea, ammoniac
or UAN that you desire.
- If you
have machines that can apply two types of fertilizers, separating the fertilizer from
seeds line, you can also apply great quantities of urea, avoiding the pre-sowing
second step is to verify the hydro state and the population of plants so that you can
determine the amount of nitrogen to be added, in between 20 to 30 days from the emergency.
This should be enough to cover at least two thirds of the total, not inferior to 25Kg per
hectare of nitrogen.
- If you
decide to apply part of it to the plants, consider the use of nitrogen sources more
efficient then urea, like the common nitrate of ammonia or calcareous, incorporated UAN,
sulfate or sulfur nitrate of ammonia, if the necessity of sulfur should have been
manual applications, you have to make sure to regulate the traffic of the machines
so to avoid the irregular spay of nitrogen, because that would result in less efficient
use of it and less returns.
third possible moment is the one before the piping, about 60 days after the emergency.
In case a of a sure previous fertilization and if a good perspective of returns or prices
is expected, a complementary application of at least 20Kg per hectare of nitrogen is
Finally and diminishing the possibility of illnesses attacks, an
application of urea or ammonia nitrate, together with the fungicide can be use. This is specifically done to
increment the percentage of proteins in the grains.
Recent studies indicate that close to half of all northern wheat fields
respond to sulfur. To cover part of the nitrogen requirements with sulfate or sulfur
nitrate, replacing the urea can be worth it on correctly diagnose cases, like zones with
potentially high performance and low levels of sulfur or organic material.