Zinc and boron doses and effects of gas enchange during maize vegetative phase
Abstract
Nutrient availability is a factor that affects crops´ gas exchange. Current study evaluates the effects of the application of micronutrients zinc (Zn) and boron (B) on photosynthesis, stomatic conductance and transpiration of corn plants grown in Eutrophic Cambide during the vegetative phase. The study was carried out in a greenhouse with two concomitant experiments. In the first experiment, zinc dose levels (0, 2, 4 and 6 mg dm-3) were applied, whilst in the other, boron doses (0, 1, 2 and 3 mg dm-3) were applied. Experimental design was totally randomized, with five replications. Study lasted 50 days after plant emergence. Variables evaluated comprised photosynthesis rate (Tf), leaf transpiration (E) and stomatic conductance (gs). Above parameters were employed to calculate the momentary (EUAm = Tf/E) and intrinsic (EUAi = Tf/gs) efficiency of water use. The application of Zn and B doses resulted in significant differences (p < 0.01) in all variables. Further, 6 mg dm-3 of Zn resulted in lower photosynthesis rates and greater stomatic conductance and transpiration. B doses caused linear increase in photosynthesis, stomatic conductance and transpiration. Doses of micronutrients Zn and B significantly increased gas exchange of corn plants in vegetative stage. Photosynthetic rate decreased as from dose 3.75 mg dm-3 of Zn.References
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