Iron deficiency depresses growth of furrow irrigated soybean and pigeon pea on vertisols of northern N.S.W. [New South Wales]
1992
Hodgson, A.S. | Rogers, E.F. (New South Wales Agriculture, Narrabri (Australia). Agricultural Research Station) | Holland, J.F. (New South Wales Agriculture, Tamworth (Australia). Agricultural Research Centre)
In soybean, chelated Fe applied to the soil before sowing increased the levels of active Fe in leaves by up to 42 percent and dry matter of shoots by up to 46 percent early in the season. Active Fe and dry matter of shoots were linearly correlated. Soil Fe treatments did not affect leaf photosynthesis, although addition of chelated Fe to the soil resulted in greener leaves than in the control. Foliar Fe had no significant effect on active Fe, leaf colour, or leaf photosynthesis. The 9 percent increase in grain yield in response to application of 20 kg Fe per ha to the soil was not significant. In pigeon pea, application of 20 kg Fe per ha to the soil increased dry matter by 140 percent and grain yield by 414 percent. Effects of lime and zinc were not significant but N plus P increased yield by 112 percent. The study showed that Fe deficiency is limiting the growth and-or yield of irrigated soybean and pigeon pea on the clay soils of northern N.S.W., and pointed to lime-induced iron chlorosis as a possible mechanism of damage.
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