Abstract
A field trial was conducted through 2015 and 2016 growing seasons to study the effect of nitrogen fertilizer sources and foliar spray with molybdenum (Mo), salicylic acid (SA) and their combination on tubers yield, some chemical constituents, nutrients uptake, nitrate accumulation and nitrate reductase activity in potato tubers. N source was added at a rate of 350kg N ha-1in five equal doses as two different forms, the first is urea and the second is ammonium sulfate plus calcium nitrate equally. SA was sprayed with three rates of 0, 75 and 150mg l-1. Also, Mo as ammonium molybdate was sprayed using three rates 0, 50 and 100mg l-1Mo. Both treatments of SA and Mo were applied separately as well as with each other, at three successive times 30, 50 and 70days after planting of potato plants. Results indicated that the addition of 350kg N ha-1 as ammonium sulfate and calcium nitrate equally caused a significant elevation (P > 0.05) in fresh weight, chlorophyll b, carotenoids, chlorophyll a, nitrate reductase activity, dry weight and NPK uptake by potato tubers compared with the same amount of nitrogen in the form of urea only. All the aforementioned characteristics were improved with increasing concentration of Mo and/or SA. The highest accumulation of nitrate was recorded under the addition of 350kg N ha-1 as urea alone. The highest average of all the aforementioned characteristics was observed at the treatment of 350kg N ha-1 as ammonium sulfate and calcium nitrate equally plus spraying with 100mg l-1Mo and 150mg l-1 SA. In contrast, this treatment gave the lowest accumulation of nitrates in potato tubers.
Published Version
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