Agriculture Reference
In-Depth Information
Depending on vine density, recommended spray concentrations are in the
range of 1 to 5 g/L in spray volumes of 200 to 1000 L/ha, giving application
ratesfrom0.1kg/haforMoto0.33kg/haforBto1kg/haforZn.Ifapplied
directly to the soil, the rate would be 1 to 7 kg of the element per ha (to be
applied once in five to six years). Box 3.8 shows how to calculate the amount of
either a macro- or micronutrient fertilizer to be applied per hectare or per meter
of vine row.
Box 3.8 How to Calculate Fertilizer Application Rates
heamountoffertilizerrequired(the“rate”)tosupplyarecommendedamountof
anutrientiscalculatedasfollows:
kg nutrient per ha
nutrient (%) in
(B3.8.1)
Fertilizer rate (kg/ha)
=
the fertilizer
×
100
So if the recommendation is for 30 kg N/ha and the fertilizer chosen is
NH
4
NO
3
(34%N),theraterequiredis
30
34
(B3.8.2)
×=
kg/ha
100
88
Rates for micronutrient fertilizers applied to the soil are calculated the same
way, except that these rates are much lower than for N, P, and K.
Usually fertilizer is applied to the vine rows, in which case the amount
requiredperrowwilldependontherowspacing.Supposetherecommendedrate
is
y
kg/ha and the row spacing is
x
meters. The total length of rows per hectare will
be 10,000/
x
(meters)andtheamountoffertilizerrequiredpermeterofrowis
given by
yx
10000
kg
(B3.8.3)
heequationtoconvertfromafertilizerrateinkilogramsperhectaretoan
amount(grams)persquaremeteris
kg fertilizer per ha
(B3.8.4)
2
=
g fertilizer per m
10
