Effect of sulphur levels and sources on composition and yield of onion (Allium cepa)

Effect of sulphur levels and sources on composition and yield of onion (Allium cepa)

2004

A:PS

The effects of S (0, 15, 30 or 60 kg/ha) applied through gypsum or the slow-release fertilizer Sulfer 95 on the composition and yield of onion (cv. Patna Red) were studied in Palampur, Himachal Pradesh, India, during the winter of 2000/01 and 2001/02. S application significantly increased bulb and foliage yields, and S content of and uptake by foliage and bulb + foliage. The dry weight of bulb and foliage, and N and S uptake by bulbs and bulb + foliage increased with increasing S rate up to 30 kg/ha. At 30 kg/ha, the bulb yield increased by 105% over no S. The S content of bulbs increased from 0.26 to 0.49%, whereas the N:S ratio decreased from 8.9 to 6.1 following the application of S at 30 kg/ha compared with 15 kg/ha. Bulb yield, bulb N content, and bulb N uptake did not significantly vary with the S source, whereas gypsum had a greater positive effect on S uptake by bulb and foliage, S uptake by bulb + foliage, N uptake by foliage, and N uptake by bulb + foliage than Sulfer 95. The S content of bulbs was also higher (0.57%) and the N:S ratio was lower (4.6) when gypsum was applied than Sulfer 95 (0.25% and 9.2, respectively).

v.74(4):219-220, INDIAN JOURNAL OF AGRICULTURAL SCIENCES

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