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Effect of zinc foliar application at an early stage of maize growth on patterns of nutrients and dry matter accumulation by the canopy. Part I. Zinc uptake patterns and its redistribution among maize organs

100%

Grzebisz W., Wronska M., Diatta J. B., Dullin P.

Journal of Elementology

2008

tom 13

nr 1

As reported in the paper by Grzebisz et al. (this issue), maize crop treated foliarly with fertilizer zinc at early stages of growth produced significantly high yields. Growth analysis procedures were applied to explain various effects of fertilizer zinc on grain yield increase and zinc accumulation and redistribution among maize organs in the course of the growing season. Therefore, based on the obtained zinc uptake characteristics, two major and one minor, but time-separated hot spots of zinc accumulation by maize plants have been distinguished. The first one, as described by RUR-Zn data, extended from the BBCH7 to BBCH9 stages. The second one, as expressed by CUR-Zn data, appeared during the milk stage of kernels growth and could be decisive for kernels sink capacity for accumulating carbohydrates. A minor hot spot, which occurred at tasselling may be responsible for pollen production and activity. The first zinc hot spot has also revealed the diagnostic problem of soil and plant tests for zinc. Current tests tend to overestimate plant zinc nutritional status, and therefore need to be urgently revised. Vegetative organs such as leaves and stems were only the minor sources of zinc for developing maize kernels. During grain filling period, most zinc absorbed by maize plants originated from soil resources.

Effect of zinc foliar application at an early stage of maize growth on patterns of nutrients and dry matter accumulation by the canopy. Part II. Nitrogen uptake and dry matter accumulation patterns

100%

Grzebisz W., Wronska M., Diatta J. B., Szczepaniak W.

Journal of Elementology

2008

tom 13

nr 1

A two-year field trial was carried out in order to outline reasons of maize grain yield increase due to foliar application of zinc, and to evaluate its effects on the dynamics of nitrogen and dry matter accumulation in the course of the growing season. Growth analysis methods were applied to describe the trends exhibited by the canopy and plant’s growth. Maize plants fertilized with zinc were able to increase the rate of nitrogen uptake, as indicated by the values of absolute crop uptake rate for N (CUR-N), at two distinct time-separated phases of growth, i.e., (i) from 7th to 9th leaf and (ii) from milk to physiological maturity of kernels growth. Physiological processes occurring in these two time-separated phases resulted in an increase of maize yielding capacity. The effect of zinc as recorded in the first phase resulted in extension rate of new organs or tissues ingrowth, as confirmed by the RGR analysis. At the reproductive phase of maize growth, plants well supplied with zinc accumulated more nitrogen, which was a prerequisite for significantly higher rate of dry matter accumulation, as confirmed both by CGR and RGR analyses. The amount of extra nitrogen taken up by Zn treated plants was sufficiently high to increase grain yield by 1.5 t ha-1, which was achieved in the conducted experiment.

Ograniczanie wyników

2 Journal of Elementology

2 Diatta J. B.

2 Grzebisz W.

2 Wronska M.

1 Dullin P.

1 Szczepaniak W.

2 2008

Wyniki wyszukiwania

Effect of zinc foliar application at an early stage of maize growth on patterns of nutrients and dry matter accumulation by the canopy. Part I. Zinc uptake patterns and its redistribution among maize organs

Effect of zinc foliar application at an early stage of maize growth on patterns of nutrients and dry matter accumulation by the canopy. Part II. Nitrogen uptake and dry matter accumulation patterns