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



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



Journal of Agricultural Science, Cambridge 86(1): 17-21



Studies were conducted to determine possible leaching or fixation problems in growing sudangrass (Sorghum sudanense Stapf.) when urea, (NH4)2SO4 plus triple superphosphate, and ammonium polyphosphate fertilizer were applied as a seed bed application to the very sandy soils of the Libyan Sahara near the Kufra Oasis. The effectiveness of the N source was measured by plant color, leaf analysis and seedling height. The urea N plus single superphosphate when applied and watered-in did not supply enough N 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 N 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 N 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 (NH4)2SO4 under comparable circumstances, sudangrass seedling height was 21.7 cm. The plants receiving no N applied before sowing were 6.7 cm high, similar to those which received urea. Under these virgin sandy soil conditions, the (NH4)2SO4 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. N 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 N.

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Accession: 000358238

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DOI: 10.1017/s0021859600064923


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