Author:
Brennan R. F.,Gartrell J. W.,Adcock K. G.
Abstract
The residual value of manganese fertiliser for seed (grain) production of
lupin (Lupinus angustifolius L.) was measured in 2
long-term (16 years) field experiments on 2 different soils (sand, lateritic
ironstone gravel–sand) when manganese sulfate was placed (drilled) with
the seed at about 5 cm while sowing. Relative to the nil-manganese treatment,
additions of manganese fertiliser increased yields by about 1.0 t seed/ha
and decreased the amount of split seed from about 80% to less than
5%. Additions of manganese fertiliser did not affect plant density
(measured 1 month after sowing) or the yield of dried shoots. The residual
value of manganese fertiliser was measured in 1994 for grain production of
lupin, for manganese applied once only to plots not treated with manganese
before, either in 1994 (current manganese) or in a previous year (previous
manganese), applied in one of the following years: 1978, 1982, 1988, 1991. The
residual value of previous manganese for grain production decreased relative
to the effectiveness of current manganese, the decrease increased with
increasing time since application. The decrease in the relative value varied
with soil type. For example, the sandy soil showed a larger decrease in the
effectiveness of manganese compared with the gravelly sand. For the sandy
soil, 16 years after application the manganese application was about one fifth
as effective as current manganese, for lupin grain production. As measured
using soil test manganese, critical soil manganese values for
diethtlenetriamine penta-acetic acid, ammonium acetate, and ammonium acetate
plus hydoxy quinone extraction varied with soil type. For example, the
diethtlenetriamine penta-acetic acid critical concentration of manganese for
grain yield for the sand was about 2 mg/kg compared with about 4 mg/kg
for the gravelly sand. The critical concentration of manganese in the youngest
vegetative bud for maximum seed yield was about 50 mg/kg while the
critical concentration of manganese in the stem at mid-flowering of the main
stem was about 20 mg/kg. Having a manganese concentration above the
critical concentration of manganese in either plant tissues resulted in split
seed levels of less than 5%.
Subject
General Agricultural and Biological Sciences
Cited by
8 articles.
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