ooooooooooIt is important
to distinguish the utilization of agricultural gypsum
from that of limestone. The two products are not competitors,
they complement each other. Limestone acts on the surface
layer of soils (up to 25 cm in depth), correcting acidity
and increasing the pH on the layer it has been incorporated
to. The agricultural gypsum acts on the deepest layer
of soils, attacking acidity sources without, however,
altering their pH.
from supplying calcium and sulfur nutrients to the deepest
layers of soils, the agricultural gypsum neutralizes toxic
aluminum and increases soil porosity, thus decreasing resistance
to the penetration of roots, which can seek the nutrients
and water they need in broader horizons. In a large portion
of Brazilian soils, the chemical barrier formed by the presence
of toxic aluminum is accountable for the lesser root development
of several crops as compared to the soils of other countries
which do not present this problem, as shown in the following
of Root System (cm)
Kafler, N. F. (1986)
ooooooooooResearch has demonstrated
that the use of agricultural gypsum increases the efficiency
of nutrient absorption, from those of greater mobility,
like nitrogen, to those of lesser mobility, like phosphorus.
The following chart shows the absorbed nutrients (contained
in the hay and grains) of a wheat crop submitted to a hot
spell at the time of blooming.
Circular nº 32 - EMBRAPA
ooooooooooThe increase in the
production of annual crops as a result of the utilization
of agricultural gypsum has been observed in experiments
undertaken throughout the country, as demonstrated in the
examples which follow:
ooooooooooResponse of maize
and oats to agricultural gypsum in a Clayey soil with 17%
clay (Source: Boletim Técnico da EPAGRI, adapted
from Bianchi et al. – 1990, quoted by Ernani et al. - 1992).
- Dry Matter
Boletim Técnico nº 122 - EPAGRI-SC
ooooooooooEffect of agricultural
gypsum application to soil, in the productivity of annual
crops submitted to hot spells at the time of blooming (Source:
Circular Técnica nº 32 – EMBRAPA).
on the subject can be obtained in the Boletim Técnico
no. 122 of EPAGRI – Empresa de Pesquisa Agropecuária
e Extensão Rural de Santa Catarina S.A., in the Circular
Técnica nº 32 ISSN 0102-0102 dated October 1997,
of EMBRAPA – Empresa Brasileira de Pesquisa Agropecuária,
in the Proceedings I and II of the Seminar on the use of
Gypsum in Agriculture (EMBRAPA, IBRAFOS) and in the Newsletter
Agricultural Gypsum in the Improvement of Root Environment
in the Subsoil.
to always seek advice from an agronomist or
an agricultural technician in your region.