ISHS Acta Horticulturae 371: VII International Symposium on Timing Field Production of Vegetables
INFLUENCE OF NITROGEN FERTILIZATION ON THE DYNAMICS OF GROWTH AND PRODUCTIVITY OF SWEET CORN |
| Author: | S.D. Stoyanova |
| Keywords: | Rate of growth, Stages of plant development, Rate of nitrogen fertilizer application, 24-h growth, Structural analysis, Yield of cobs |
| 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. | |
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