Evaluation of yield and nitrogen utilisation with urease and nitrification inhibitors in sweet potato crop (Ipomoea batatas L.)
, , , , und | 02. Sept. 2020
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Article Category: Research Article
Online veröffentlicht: 02. Sept. 2020
Seitenbereich: 147 - 157
Eingereicht: 04. Apr. 2020
Akzeptiert: 27. Juli 2020
DOI: https://doi.org/10.2478/fhort-2020-0014
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© 2020 Kakabouki Ioanna et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
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Effect of fertilizer (urea, urea + UI, urea + NI + UI, control) and both years of experiment (year A: 2018 and year B: 2019) on LAI, number of tuber per plant, marketable yield (Kg · ha−1), non-marketable yield (Kg · ha−1), percentage of marketable, tubers (no · ha−1), mean fresh weight tuber (Kg), yield (Kg · ha−1), DM upper leaves and stems (Kg · ha−1), N% tuber, N% upper parts by Fisher's LSD
| LAI | No tuber per plant | Marketable yield (Kg·ha−1) | Non-marketable yield (Kg·ha−1) | Percentage of marketable | Tubers (no·ha−1) | Mean fresh weight tuber (Kg) | Yield (Kg·ha−1) | DM upper leaves and stems (Kg·ha−1) | N% tuber | N% upper parts | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Year A | |||||||||||
| Urea | 5 ac | 5.75 a | 20,072 a | 7,273 ns | 73 ns | 184,122 a | 0.149 ns | 27,346 a | 5,150 ac | 1.026 a | 0.470 a |
| Urea + UI | 5.07 b | 6.23 b | 22,285 b | 7,530 ns | 75 ns | 201,739 b | 0.148 ns | 29,815 b | 5,406 bc | 1.169 b | 0.476 b |
| Urea + NI + UI | 5.14 a | 6.39 b | 23,230 b | 7,694 ns | 75 ns | 204,522 b | 0.151 ns | 30,923 b | 5,411 b | 1.330 c | 0.490 b |
| Control | 5.05 c | 5.50 a | 18,412 c | 6,866 ns | 73 ns | 175,304 a | 0.144 ns | 25,433 c | 5,111 a | 1.076 ab | 0.436 a |
| Year B | |||||||||||
| Urea | 5.11 ac | 5.42 a | 19,700 a | 7,963 ns | 71 ns | 173,280 a | 0.160 ns | 27,663 a | 5,288 ac | 1.083 a | 0.493 a |
| Urea + UI | 5.25 b | 5.75 b | 20,902 ab | 8,103 ns | 72 ns | 183,760 b | 0.158 ns | 29,005 b | 5,488 bc | 1.158 b | 0.480 b |
| Urea + NI + UI | 5.35 a | 6.08 b | 21,273 b | 8,518 ns | 72 ns | 194,800 b | 0.152 ns | 29,515 b | 5,705 b | 1.293 c | 0.483 b |
| Control | 4.90 c | 5.25 a | 18,180 c | 7,990 ns | 74 ns | 168,240 a | 0.109 ns | 18,440 c | 5,017 a | 0.825 ab | 0.325 a |
| Ffertilization | 7.88 | 35.759 | 57.504 | 1.615 ns | 0.23 ns | 35.759 | 1.795 ns | 40.776 | 11.376 | 26.702 | 3.419 |
| Fyear | 5.088 | 28.603 | 17.664 | 12.394 | 2.316 ns | 28.603 | 5.072 | 2.653 ns | 2.523 ns | 0.002 ns | 0.163 ns |
| Ffertilization×year | 0.917 ns | 1.196 ns | 3.097 | 0.272 ns | 0.545 ns | 1.196 ns | 0.881 ns | 1.007 ns | 1.47 ns | 0.99 ns | 0.25 ns |
Pearson's correlation coefficient (r) of yield measurements and nitrogen measurement indices
| N% tuber | N% upper parts | Nitrogen uptake in upper parts Kg · ha−1 | Nitrogen uptake in tuber Kg · ha−1 | Nitrogen total uptake Kg · ha−1 | Tuber protein yield Kg · ha−1 | NUE | NHI | NAE | |
|---|---|---|---|---|---|---|---|---|---|
| LAI | 0.530 | 0.152 ns | 0.309 ns | 0.430 | 0.446 | 0.430 | 0.488 | 0.269 ns | 0.370 ns |
| No tuber/plant | 0.657 | −0.080 ns | 0.046 ns | 0.693 | 0.666 | 0.693 | 0.631 | 0.680 | 0.284 ns |
| Marketable yield Kg · ha−1 | 0.705 | 0.148 ns | 0.242 ns | 0.819 | 0.809 | 0.819 | 0.774 | 0.643 | 0.658 |
| Non-marketable yield Kg · ha−1 | 0.185 ns | 0.470 | 0.634 | 0.257 ns | 0.321 ns | 0.257 ns | 0.269 ns | −0.133 ns | 0.342 ns |
| % of marketable | 0.281 ns | −0.344 ns | −0.386 ns | 0.261 ns | 0.202 ns | 0.261 ns | 0.249 ns | 0.489 | 0.154 ns |
| Tubers no ha−1 | 0.657 | −0.080 ns | 0.046 ns | 0.693 | 0.665 | 0.693 | 0.631 | 0.680 | 0.284 ns |
| Mean fresh weight tuber Kg | −0.163 ns | 0.472 | 0.452 | −0.059 ns | −0.001 ns | −0.058 ns | −0.023 ns | −0.383 ns | 0.348 ns |
| Yield Kg · ha−1 | 0.702 | 0.399 ns | 0.546 | 0.858 | 0.883 | 0.858 | 0.814 | 0.495 | 0.727 |
| DM tuber Kg · ha−1 | 0.422 | 0.433 | 0.479 | 0.511 | 0.545 | 0.512 | 0.422 | 0.199 ns | 0.504 |
| DM upper Kg · ha−1 (leaves and stems) | 0.382 ns | 0.389 ns | 0.756 | 0.460 | 0.529 | 0.460 | 0.565 | −0.0143 ns | 0.420 |
Nitrogen uptake in upper parts (Kg · ha−1), nitrogen uptake in tuber (Kg · ha−1), nitrogen total uptake (Kg · ha−1), NUE, NHI and NAE as affected by fertilizer treatments (urea, urea + UI, urea NI + UI) and years (year A: 2018 and year B: 2019)
| Nitrogen uptake in upper parts (Kg·ha−1) | Nitrogen uptake in tuber (Kg·ha−1) | Nitrogen total uptake (Kg·ha−1) | NUE | NHI | NAE | |
|---|---|---|---|---|---|---|
| Year A | ||||||
| Urea | 24.230 a | 112 a | 136 a | 0.016 a | 0.822 a | 17.237 a |
| Urea+UI | 25.760 b | 139 b | 165 b | 0.276 b | 0.844 ab | 37.809 b |
| Urea+NI+UI | 26.540 b | 165 c | 191 c | 0.492 c | 0.861 b | 47.047 b |
| Control | 22.494 a | 110 a | 132 a | – | 0.829 c | – |
| Year B | ||||||
| Urea | 26.055 a | 120 a | 146 a | 0.034 a | 0.821 a | 23.542 a |
| Urea+UI | 26.435 b | 134 b | 161 b | 0.263 b | 0.836 ab | 34.729 b |
| Urea+NI+UI | 27.546 b | 153 c | 180 c | 0.425 c | 0.847 b | 38.979 b |
| Control | 16.112 a | 81 a | 97 a | – | 0.625 c | – |
| Ffertilization | 5.888 | 68.165 | 69.300 | 65.327 | 6.482 | 24.464 |
| Fyear | 0.842 ns | 1.222 ns | 0.571 ns | 0.323 ns | 1.199 ns | 0.103 ns |
| Ffertilization ×year | 0.251 ns | 2.216 ns | 2.117 ns | 0.452 ns | 0.311 ns | 0.658 ns |