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An Apparatus for Application of Nitrogen‐15 Fertilizers Through Buried Drip Tubing
Author(s) -
McGee E. A.,
Thompson T. L.,
McCreary T. W.
Publication year - 1995
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1995.03615995005900050040x
Subject(s) - fertigation , lactuca , drip irrigation , nitrogen , agronomy , horticulture , mathematics , biology , irrigation , chemistry , organic chemistry
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.