Abstract
Field studies were conducted to evaluate the effect of various fertilizer placements on nutrient uptake, growth responses, storage root yield and leaf elemental concentration of Whatley/Loretan sweetpotato [Ipomoea batatas (L.) Lam.]. The fertilizer placement treatments comprised broadcast (Br), banded at two different widths (Ba), side dressing (Sd) or applied in various combinations of the above, and an untreated check. Fertilizer rates were 135, 35 and 133 kg.ha-1 each of N, P and K based on soil test. At nine weeks after planting, the fifth fully expanded leaf from the tip of five plants was collected and analyzed for elemental concentration. The plants were harvested 101 days after transplanting and biomass data were collected. Vine yield for all placement treatments was equal to or exceeded that of the full rate broadcast. Yield of US # 1 roots was increased 78 and 72%, respectively, when 2/3 of the fertilizer was banded and tended to increase total storage root yield compared to the same, full or 2/3 the rate broadcast. Leaf N was highest with 1/3 Ba at planting with two side dressings, while leaf P was reduced by all treatments compared to the check. Leaf K was highest with 2/3 the rate Br at planting. Storage root N was lower than foliar N while root K increased with 1/3 Br combined with 1/3 Ba. Root Ca, Mg, Fe and B were not significantly affected by placement. Root Mn was lower than foliar Mn suggesting that sweetpotato distributes more Mn to foliage relative to storage roots. Generally, these results suggest that placement rather than quantity of fertilizer applied enhanced yield and elemental concentration. Key words: Broadcast fertilizer, Ipomoea batatas, banded fertilizer, side-dressing, elemental concentration, storage roots, plant nutrition.
Highlights
Crop producers want increased crop yields with increased use of fertilizer inputs, which is applied through broadcasting
Vine yields produce by all Ba placement treatments at lower quantities were as great as or greater than that of the full rate Br
The results show that differences in vine yield were not evident among the comparable broadcast or banded NPK treatments
Summary
Crop producers want increased crop yields with increased use of fertilizer inputs, which is applied through broadcasting This has put a strain on the environment as they sometimes spend more on inputs to produce crops with diminishing returns. This N leaching results in principal loss and often limiting nutrient needed by plant for growth (Plošek et al, 2017). Tsuno and Fujise (1968) found that storage root yields were increased when K was banded 30 or 40 cm deep into the soil layer The objective of this experiment was to evaluate the impact of fertilizer placement treatments on vine and storage root yield, root dry matter and elemental leaf and root concentration of sweetpotato
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