Effect of urea and ammonium sulphate applied before sowing on sudangrass seedlings

Worker Jr, G.F. (1976) Effect of urea and ammonium sulphate applied before sowing on sudangrass seedlings. Journal of Agricultural Science, 86 (1). pp. 17-21.

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On sandy soils of the Libyan Sahara urea nitrogen plus single superphosphate when applied and watered-in did not supply enough nitrogen to obtain a vigorous green seedling compared with ammonium polyphosphate (21% N, 53% P2O5), which produced excellent vigorous green seedlings. The ammonia source supplied more nitrogen than the urea under the conditions of these trials. The application of urea 1,2,4, and 8 days before sowing was inadequate in supplying nitrogen to meet the early demand of the sudangrass seedlings. Sudangrass seedlings after 26 days were only 5-6.3 cm tall. With a seed-bed application of 36-72 kg N/ha as ammonium sulphate under comparable circumstances, sudangrass seedling height was 21.7 cm. The plants receiving no nitrogen applied before sowing were 6.7 cm high, similar to those which received urea. Under these virgin sandy soil conditions, the ammonium sulphate and ammonium polyphosphate (21% N, 53% P2O5) fertilizers applied to the seed bed were retained within the root zone in sufficient amounts to give a vigorous, non-deficient sudangrass seedling. Nitrogen from urea was deficient and presumed leached beyond reach of the seedling root when applied to the seed bed. Applied post-emergence, however, urea was a very satisfactory source of nitrogen

Item Type: Article
Author Affiliation: Department of Agronomy and Range Science, University of California Imperial Valley, Field Station, El Centro, California 92243, USA
Subjects: Plant Production
Divisions: Other Crops
Depositing User: Ms K Syamalamba
Date Deposited: 24 Jul 2012 08:27
Last Modified: 24 Jul 2012 08:27
Official URL: http://dx.doi.org/10.1017/S0021859600064923
URI: http://eprints.icrisat.ac.in/id/eprint/6964

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