Articles
INFLUENCE OF NITROGEN FERTILIZATION ON THE DYNAMICS OF GROWTH AND PRODUCTIVITY OF SWEET CORN
Article number
371_56
Pages
421 – 430
Language
Abstract
The influence of nitrogen fertilizers on the growth dynamics and productivity of sweet corn cultivar Aurika was investigated on field experiments in 1988 – 1990 under irrigated conditions.
After the predecessor (barley) harvesting, basal dressing was applied with 120 kg P2O5/ha and 80 kg K2O/ha before deep ploughing (20–25 cm). Planting was done according to the optimum period of the region – mid April.
The interrow spacing was 70 cm, and that between plants 25 cm.
Nitrogen fertilizers were applied before planting at 120, 160 and 200 kg N/ha.
Nitrogen did not actually affect the plant growth rate.
Strong changes were observed according to the stages of plant development.
The growth rate in the 30-day period after emergence was slow (0.84 – 1.20 cm per 24-h growth). Then a height increase was observed, that reached its maximum (ca. 5.3 cm of 24-h growth) during the period of tillering and tasseling.
Under the influence of fertilizing, the rate of growth changed from 0.04 to 1.28 cm.
The plants fertilized at 160 and 200 kg N/ha had better rate of growth than those fertilized at 120 kg N/ha.
The climatic conditions in the years of the experiment exerted a significant effect on the rate of growth (a 3 cm difference was observed in the 24-h growth). The highest yield of sweet corn was obtained with the application of 160 kg N/ha.
After the predecessor (barley) harvesting, basal dressing was applied with 120 kg P2O5/ha and 80 kg K2O/ha before deep ploughing (20–25 cm). Planting was done according to the optimum period of the region – mid April.
The interrow spacing was 70 cm, and that between plants 25 cm.
Nitrogen fertilizers were applied before planting at 120, 160 and 200 kg N/ha.
Nitrogen did not actually affect the plant growth rate.
Strong changes were observed according to the stages of plant development.
The growth rate in the 30-day period after emergence was slow (0.84 – 1.20 cm per 24-h growth). Then a height increase was observed, that reached its maximum (ca. 5.3 cm of 24-h growth) during the period of tillering and tasseling.
Under the influence of fertilizing, the rate of growth changed from 0.04 to 1.28 cm.
The plants fertilized at 160 and 200 kg N/ha had better rate of growth than those fertilized at 120 kg N/ha.
The climatic conditions in the years of the experiment exerted a significant effect on the rate of growth (a 3 cm difference was observed in the 24-h growth). The highest yield of sweet corn was obtained with the application of 160 kg N/ha.
Authors
S.D. Stoyanova
Keywords
Rate of growth, Stages of plant development, Rate of nitrogen fertilizer application, 24-h growth, Structural analysis, Yield of cobs
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