| Autor: |
E. A. McGee, T. L. Thompson, T. W. McCreary |
| Rok vydání: |
1995 |
| Předmět: |
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| Zdroj: |
Soil Science Society of America Journal. 59:1495-1498 |
| ISSN: |
0361-5995 |
| DOI: |
10.2136/sssaj1995.03615995005900050040x |
| Popis: |
This study evaluated a new apparatus for applying 15 N by fertigation to subplots under buried drip irrigation. Leaf lettuce (Lactuca sativa L. cv. Waldmann's Green) was planted in one unfertilized buried-drip-irrigated plot (4.06 by 53.34 m) with four north-south beds. Six subplots (1.02 by 2.00 m) were established by placing a 15 N injection apparatus into the drip tubing. Nitrogen-rate treatments (71 and 176 kg ha -1 were replicated three times. Low- and high-N plots received 1.60 and 1.15 atom % 15 N urea applied at five times during the season. Plants were harvested at specific positions within and near the subplots. Uniform recovery of 15 N by plants within subplots occurred. Uptake of 15 N by plants was observed up to 45 cm outside subplots in the north-south directions and in plants on beds immediately adjacent to the subplots. Uptake outside the subplots in the north-south directions (apparent lateral movement) was no more than 21% of total 15 N uptake. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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