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Effect of nitrogen fertilizer application on growth, biomass production and N‐uptake of torpedograss ( Panicum repens L.)

Effect of nitrogen fertilizer application on growth, biomass production and N‐uptake of... A glasshouse study was conducted to evaluate the effects of different rates (0, 50, 100, 200 and 400 kg ha−1) of nitrogen (N) fertilizer application on the growth, biomass production and N‐uptake efficiency of torpedograss. The growth responses of torpedograss to the N application were significant throughout the observation periods. Torpedograss grown for 60 days obtained the highest total biomass of 23.0 g plant−1 with an application of 200 kg ha−1 N, followed by 20.4 g plant−1 with an application of 100 kg ha−1 N; when it was grown for 90 days a significantly higher biomass of 102.3–106.0 g plant−1 was obtained with the 200–400 kg ha−1 N than the biomass (68.0 g plant−1) obtained with the fertilizer applied at a lower rate. When the torpedograss was grown for 130 days the highest biomass was 230.0 g plant−1 with the 400 kg ha−1 N application, followed by a biomass of 150.0 g plant−1 with the 200 kg ha−1 N application, but the above‐ground shoot in all treatments was over mature for animal food. The ratio of the above‐ground shoot to the underground part increased with the increase in N application up to 400 kg ha−1 during the 90 days after planting (DAP), but the above‐ground shoot biomass was the same with the 200 and 400 kg ha−1 N. The agronomic efficiency of the N application decreased to 5–38 with the increase in N application to 400 kg ha−1, which was less than half the agronomic efficiency with the 200 kg ha−1 N. The agronomic efficiency of N was very low (5–22) during the 60 DAP, which indicated that the N application would not be economically viable in this period for torpedograss as a pasture, and short‐duration plants could be cultivated in torpedograss‐infested fields to minimize weed‐crop competition. The nitrogen concentration (%) in the torpedograss increased with the increase in N application, but N‐uptake efficiency was the opposite and the value was very low with the 400 kg ha−1 N. The above results lead us to conclude that the N application rate of 200 kg ha−1 is the most effective for torpedograss growth. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Weed Biology and Management Wiley

Effect of nitrogen fertilizer application on growth, biomass production and N‐uptake of torpedograss ( Panicum repens L.)

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References (21)

Publisher
Wiley
Copyright
Copyright © 2004 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1444-6162
eISSN
1445-6664
DOI
10.1111/j.1445-6664.2004.00124.x
Publisher site
See Article on Publisher Site

Abstract

A glasshouse study was conducted to evaluate the effects of different rates (0, 50, 100, 200 and 400 kg ha−1) of nitrogen (N) fertilizer application on the growth, biomass production and N‐uptake efficiency of torpedograss. The growth responses of torpedograss to the N application were significant throughout the observation periods. Torpedograss grown for 60 days obtained the highest total biomass of 23.0 g plant−1 with an application of 200 kg ha−1 N, followed by 20.4 g plant−1 with an application of 100 kg ha−1 N; when it was grown for 90 days a significantly higher biomass of 102.3–106.0 g plant−1 was obtained with the 200–400 kg ha−1 N than the biomass (68.0 g plant−1) obtained with the fertilizer applied at a lower rate. When the torpedograss was grown for 130 days the highest biomass was 230.0 g plant−1 with the 400 kg ha−1 N application, followed by a biomass of 150.0 g plant−1 with the 200 kg ha−1 N application, but the above‐ground shoot in all treatments was over mature for animal food. The ratio of the above‐ground shoot to the underground part increased with the increase in N application up to 400 kg ha−1 during the 90 days after planting (DAP), but the above‐ground shoot biomass was the same with the 200 and 400 kg ha−1 N. The agronomic efficiency of the N application decreased to 5–38 with the increase in N application to 400 kg ha−1, which was less than half the agronomic efficiency with the 200 kg ha−1 N. The agronomic efficiency of N was very low (5–22) during the 60 DAP, which indicated that the N application would not be economically viable in this period for torpedograss as a pasture, and short‐duration plants could be cultivated in torpedograss‐infested fields to minimize weed‐crop competition. The nitrogen concentration (%) in the torpedograss increased with the increase in N application, but N‐uptake efficiency was the opposite and the value was very low with the 400 kg ha−1 N. The above results lead us to conclude that the N application rate of 200 kg ha−1 is the most effective for torpedograss growth.

Journal

Weed Biology and Management – Wiley

Published: Jun 1, 2004

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