Performance of sweetpotato variety UPMSS5 inoculated with Azospirillum on sandy tin tailing soil
1996
Saad, M.S. | Ali Sabuddin, A.S. | Yunus, A.G. | Shamsuddin, Z. (Universiti Pertanian Malaysia, 43400, Serdang (Malaysia). Dept. of Agronomy and Horticulture)
Sweetpotato is popularly grown in Malaysia on marginal soils such as peats and sandy soils. Sandy soils with more than 90 percent sand require high fertilizer input. The use of biofertilizer such as nitrogen fixing bacteria can reduce chemical fertilizer requirement and consequently lower production cost. The objective of the study was to investigate the effect of three strains of Azospirillum on sweetpotato grown on sandy tin tailing soil. Sweetpotato variety UPMSS5 was inoculated with three strains of Azospirillum namely SP7, UPMB12 and UPMB14 with and without addition of N fertilizer (33 kg N/ha) at one week after planting. The results showed that Azospirillum inoculation was more effective when N fertilizer was applied at one week after planting. The Azospirillum strain UPMB14 was the most suitable for the sweetpotato variety UPMSS5. Plants treated with this strain combined with N fertilizer at one week after planting produced 1.19 kg storage root yield, 6.43 number of storage roots and 2.78 kg vines per plant. It was concluded that Azospirillum is a potentially useful biofertilizer for sweetpotato. However, for more effective Azospirillum application it is necessary to apply chemical N fertilizer during crop establishment storage
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